$120+ Cheap flights from Illinois to Oregon
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PDX
Jul 25 — Aug 11
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Illinois to Oregon with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Oregon
Cheapest
Best
Last-minute
One-way
Cheapest flights from Illinois to OregonExplore the most affordable flight options available from Illinois to Oregon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 25, 2026.
Explore the most affordable flight options available from Illinois to Oregon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 25, 2026.
This CheapOair deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/57:03 pm
STL
- PDX
1 stop25h 01m
Frontier
Wed 8/125:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Deal found 6/21![Frontier logo]()
$275
This Mytrip deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/218:10 pm
STL
- PDX
1 stop22h 25m
Frontier
Mon 10/269:34 pm
PDX
- STL
1 stop23h 05m
Frontier
Deal found 6/22![Frontier logo]()
$285
This CheapOair deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/178:10 pm
STL
- PDX
1 stop22h 25m
Frontier
Mon 9/219:34 pm
PDX
- STL
1 stop12h 17m
Frontier
Deal found 6/21![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/298:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Sun 8/21:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 6/20![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/78:08 pm
STL
- PDX
1 stop22h 28m
Frontier
Tue 7/145:16 pm
PDX
- STL
1 stop24h 07m
Frontier
Deal found 6/21![Frontier logo]()
$289
This American Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/124:57 pm
MLI
- PDX
1 stop9h 10m
American Airlines
Sat 9/196:00 am
PDX
- MLI
1 stop8h 03m
American Airlines
Deal found 6/24![American Airlines logo]()
$291
This Travelocity deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:08 pm
STL
- PDX
Nonstop4h 12m
Multiple Airlines
Mon 9/219:34 pm
PDX
- STL
1 stop12h 17m
Multiple Airlines
Deal found 6/20![Multiple Airlines logo]()
$294
This CheapOair deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:46 pm
STL
- BOI
1 stop27h 11m
Frontier
Sun 9/2712:59 pm
BOI
- STL
1 stop5h 16m
Frontier
Deal found 6/22![Frontier logo]()
$301
This Southwest deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/158:30 am
STL
- PDX
Nonstop4h 10m
Southwest
Sat 8/2210:45 pm
PDX
- STL
1 stop11h 05m
Southwest
Deal found 6/23![Southwest logo]()
$309
This Booking.com deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:57 pm
ORD
- PDX
1 stop20h 39m
Frontier
Sat 7/1112:20 pm
PDX
- ORD
1 stop6h 32m
Frontier
Deal found 6/22![Frontier logo]()
$309
This Frontier deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/277:15 am
ORD
- PDX
1 stop11h 39m
Frontier
Thu 8/66:49 pm
PDX
- ORD
1 stop8h 48m
Frontier
Deal found 6/21![Frontier logo]()
$310
This CheapOair deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:38 pm
STL
- PDX
1 stop23h 19m
Frontier
Fri 7/105:49 pm
PDX
- STL
1 stop22h 26m
Frontier
Deal found 6/24![Frontier logo]()
$311
Best flights from Illinois to OregonDiscover carefully curated flight deals from Illinois to Oregon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 25, 2026.
Discover carefully curated flight deals from Illinois to Oregon that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated June 25, 2026.
This American Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/74:28 pm
MLI
- PDX
1 stop8h 45m
American Airlines
Wed 10/1411:58 pm
PDX
- MLI
1 stop8h 46m
American Airlines
Deal found 6/20![American Airlines logo]()
$291
This Southwest deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:25 am
STL
- PDX
1 stop7h 00m
Southwest
Thu 9/103:25 pm
PDX
- STL
1 stop6h 25m
Southwest
Deal found 6/23![Southwest logo]()
$319
This Delta deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:00 pm
STL
- PDX
1 stop7h 33m
Delta
Fri 9/1812:25 am
PDX
- STL
1 stop8h 09m
Delta
Deal found 6/22![Delta logo]()
$319
This Alaska Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/212:17 pm
ORD
- PDX
Nonstop4h 37m
Alaska Airlines
Sat 10/247:00 am
PDX
- ORD
Nonstop4h 21m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$325
This United Airlines deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/225:00 am
ORD
- PDX
1 stop6h 47m
United Airlines
Wed 7/2910:40 pm
PDX
- ORD
Nonstop4h 05m
United Airlines
Deal found 6/23![United Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1910:10 am
STL
- PDX
1 stop7h 00m
Southwest
Mon 9/213:25 pm
PDX
- STL
1 stop6h 25m
Southwest
Deal found 6/20![Southwest logo]()
$319
This Alaska Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/147:20 am
ORD
- PDX
Nonstop4h 25m
Alaska Airlines
Wed 7/2210:59 pm
PDX
- ORD
Nonstop4h 01m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$325
This United Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:40 am
ORD
- BOI
Nonstop3h 48m
United Airlines
Wed 8/2612:24 pm
BOI
- ORD
Nonstop3h 38m
United Airlines
Deal found 6/20![United Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/152:00 pm
MDW
- EUG
2 stops11h 59m
Delta
Wed 9/235:51 pm
EUG
- MDW
2 stops13h 16m
Delta
Deal found 6/23![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:05 am
STL
- PDX
2 stops10h 55m
Southwest
Sun 9/1310:45 pm
PDX
- STL
1 stop10h 50m
Southwest
Deal found 6/24![Southwest logo]()
$324
This Alaska Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:08 pm
STL
- PDX
Nonstop4h 12m
Alaska Airlines
Wed 8/2611:16 am
PDX
- STL
Nonstop3h 54m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:05 am
MDW
- PDX
1 stop8h 55m
Delta
Fri 10/212:25 am
PDX
- MDW
1 stop6h 23m
Delta
Deal found 6/22![Delta logo]()
$345
This American Airlines deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/242:27 pm
STL
- BOI
1 stop8h 36m
American Airlines
Tue 9/293:21 pm
BOI
- STL
1 stop8h 06m
American Airlines
Deal found 6/25![American Airlines logo]()
$388
This Southwest deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1011:50 am
STL
- PDX
2 stops9h 30m
Southwest
Thu 8/2011:30 pm
PDX
- STL
1 stop9h 00m
Southwest
Deal found 6/22![Southwest logo]()
$324
This United Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/88:40 am
ORD
- BOI
Nonstop3h 52m
United Airlines
Thu 8/135:44 pm
BOI
- ORD
1 stop5h 15m
United Airlines
Deal found 6/24![United Airlines logo]()
$375
This Delta deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/215:35 pm
MDW
- PDX
1 stop8h 12m
Delta
Sat 10/2410:55 pm
PDX
- MDW
1 stop7h 50m
Delta
Deal found 6/20![Delta logo]()
$345
This Alaska Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/298:00 am
ORD
- EUG
1 stop7h 44m
Alaska Airlines
Wed 9/307:08 am
EUG
- ORD
1 stop10h 13m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$349
This Southwest deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/510:15 am
MDW
- PDX
Nonstop4h 15m
Southwest
Sat 9/129:00 am
PDX
- MDW
1 stop9h 15m
Southwest
Deal found 6/20![Southwest logo]()
$335
This Delta deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:00 am
ORD
- PDX
1 stop6h 45m
Delta
Wed 8/195:30 am
PDX
- ORD
1 stop5h 53m
Delta
Deal found 6/23![Delta logo]()
$345
This American Airlines deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/245:30 am
STL
- BOI
1 stop6h 49m
American Airlines
Wed 7/291:57 pm
BOI
- STL
2 stops9h 01m
American Airlines
Deal found 6/25![American Airlines logo]()
$420
This United Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/146:00 am
ORD
- EUG
1 stop8h 57m
United Airlines
Sun 7/1912:50 pm
EUG
- ORD
Nonstop4h 10m
United Airlines
Deal found 6/20![United Airlines logo]()
$384
This Alaska Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/187:20 am
ORD
- PDX
Nonstop4h 25m
Alaska Airlines
Sun 7/2610:59 pm
PDX
- ORD
Nonstop4h 01m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:30 pm
MDW
- PDX
Nonstop4h 15m
Southwest
Sat 9/1911:30 pm
PDX
- MDW
Nonstop3h 55m
Southwest
Deal found 6/24![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:30 am
ORD
- EUG
1 stop6h 49m
Delta
Sat 10/2412:40 pm
EUG
- ORD
1 stop7h 13m
Delta
Deal found 6/21![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:53 am
ORD
- EUG
Nonstop4h 44m
United Airlines
Wed 8/51:59 pm
EUG
- ORD
1 stop9h 00m
United Airlines
Deal found 6/22![United Airlines logo]()
$384
This Alaska Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/117:20 am
ORD
- PDX
Nonstop4h 25m
Alaska Airlines
Sun 8/1610:59 pm
PDX
- ORD
Nonstop4h 01m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:00 am
MDW
- PDX
1 stop6h 10m
Southwest
Sat 8/225:30 pm
PDX
- MDW
1 stop9h 30m
Southwest
Deal found 6/21![Southwest logo]()
$345
This Delta deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/287:00 am
ORD
- EUG
1 stop8h 04m
Delta
Sun 8/301:44 pm
EUG
- ORD
1 stop5h 46m
Delta
Deal found 6/24![Delta logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/177:00 am
STL
- BOI
1 stop9h 27m
Alaska Airlines
Wed 11/186:33 am
BOI
- STL
1 stop6h 42m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$363
This United Airlines deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/198:40 am
ORD
- BOI
Nonstop3h 52m
United Airlines
Fri 7/245:46 pm
BOI
- ORD
1 stop5h 58m
United Airlines
Deal found 6/20![United Airlines logo]()
$417
Last-minute flights from Illinois to OregonDiscover last-minute flight deals from Illinois to Oregon. Data last updated June 25, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Oregon. Data last updated June 25, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/17:20 am
ORD
- PDX
Nonstop4h 25m
Multiple Airlines
Fri 7/315:49 pm
PDX
- ORD
1 stop9h 48m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$315
This CheapOair deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/39:48 pm
ORD
- PDX
1 stop21h 09m
Frontier
Sat 7/1112:20 pm
PDX
- ORD
1 stop6h 32m
Frontier
Deal found 6/24![Frontier logo]()
$311
This CheapOair deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/37:38 pm
STL
- PDX
1 stop23h 19m
Frontier
Fri 7/105:49 pm
PDX
- STL
1 stop22h 26m
Frontier
Deal found 6/24![Frontier logo]()
$311
This Expedia deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/39:48 pm
ORD
- PDX
1 stop21h 09m
Frontier
Mon 7/612:20 pm
PDX
- ORD
1 stop6h 32m
Frontier
Deal found 6/25![Frontier logo]()
$314
This CheapOair deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/78:08 pm
STL
- PDX
1 stop22h 28m
Frontier
Tue 7/145:16 pm
PDX
- STL
1 stop24h 07m
Frontier
Deal found 6/21![Frontier logo]()
$289
This Booking.com deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/79:57 pm
ORD
- PDX
1 stop20h 39m
Frontier
Sat 7/1112:20 pm
PDX
- ORD
1 stop6h 32m
Frontier
Deal found 6/22![Frontier logo]()
$309
This Booking.com deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/89:13 pm
ORD
- PDX
1 stop16h 22m
Multiple Airlines
Tue 7/1410:59 pm
PDX
- ORD
Nonstop4h 01m
Multiple Airlines
Deal found 6/23![Multiple Airlines logo]()
$313
This Expedia deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/179:13 pm
ORD
- PDX
1 stop16h 22m
Multiple Airlines
Wed 7/2910:59 pm
PDX
- ORD
Nonstop4h 01m
Multiple Airlines
Deal found 6/24![Multiple Airlines logo]()
$312
This American Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/256:50 pm
MLI
- PDX
1 stop8h 00m
American Airlines
Fri 7/3112:45 am
PDX
- MLI
1 stop7h 54m
American Airlines
Deal found 6/24![American Airlines logo]()
$291
This Frontier deal was found by Cheapflights users on 6/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/277:15 am
ORD
- PDX
1 stop11h 39m
Frontier
Thu 8/66:49 pm
PDX
- ORD
1 stop8h 48m
Frontier
Deal found 6/21![Frontier logo]()
$310
This CheapOair deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/298:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Sun 8/21:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 6/20![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/307:10 pm
STL
- PDX
1 stop23h 44m
Frontier
Wed 8/55:21 pm
PDX
- STL
1 stop24h 02m
Frontier
Deal found 6/25![Frontier logo]()
$315
One-way flights from Illinois to OregonSearch for one-way flight options from Illinois to Oregon. Find affordable one-way fares based on user searches. Data last updated June 25, 2026.
Search for one-way flight options from Illinois to Oregon. Find affordable one-way fares based on user searches. Data last updated June 25, 2026.
This Frontier deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:46 pm
STL
- PDX
1 stop9h 53m
Frontier
Deal found 6/24![Frontier logo]()
$120
This Trip.com deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:08 pm
STL
- PDX
1 stop22h 28m
Frontier
Deal found 6/20![Frontier logo]()
$129
This CheapOair deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/237:10 pm
STL
- PDX
1 stop23h 44m
Frontier
Deal found 6/25![Frontier logo]()
$131
This Mytrip deal was found by Cheapflights users on 6/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/158:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Deal found 6/22![Frontier logo]()
$132
This CheapOair deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/188:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Deal found 6/23![Frontier logo]()
$133
This CheapOair deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/129:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 6/23![Frontier logo]()
$136
This Frontier deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:50 am
ORD
- BOI
1 stop9h 07m
Frontier
Deal found 6/24![Frontier logo]()
$138
This CheapOair deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/87:03 pm
STL
- PDX
1 stop25h 01m
Frontier
Deal found 6/24![Frontier logo]()
$140
This Expedia deal was found by Cheapflights users on 6/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/201:02 pm
ORD
- BOI
1 stop26h 55m
Frontier
Deal found 6/23![Frontier logo]()
$144
This CheapOair deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/279:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 6/24![Frontier logo]()
$149
This Southwest deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:30 am
STL
- PDX
Nonstop4h 10m
Southwest
Deal found 6/24![Southwest logo]()
$150
This CheapOair deal was found by Cheapflights users on 6/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/189:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 6/20![Frontier logo]()
$151
Find flight deals from Illinois to Oregon
Keep the following information in mind while searching for Illinois to Oregon flight deals. Data was last updated June 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $275 (CheapOair) |
One-way from | $120 (Frontier) |
Popular in | March |
Cheapest in | January |
Average price | $373 |
Good round-trip deal | $315 or less |
Good one-way deal | $168 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Oregon that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 25, 2026.
Use the filters below to find and compare flights from Illinois to Oregon that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
MolinePortland
MLI - PDX
MLIPDX
Moline Quad-City
Wed 10/7
4:28 pm-11:13 pm
1 stop8h 45m
Portland
Wed 10/14
11:58 pm-10:44 am
1 stop8h 46m
$291
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
Thu 9/3
8:25 am-1:25 pm
1 stop7h 00m
Portland
Thu 9/10
3:25 pm-11:50 pm
1 stop6h 25m
$319
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
Sat 9/12
5:00 pm-10:33 pm
1 stop7h 33m
Portland
Fri 9/18
12:25 am-10:34 am
1 stop8h 09m
$319
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
Sat 9/19
10:10 am-3:10 pm
1 stop7h 00m
Portland
Mon 9/21
3:25 pm-11:50 pm
1 stop6h 25m
$319
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
Thu 9/10
6:05 am-3:00 pm
2 stops10h 55m
Portland
Sun 9/13
10:45 pm-11:35 am
1 stop10h 50m
$324
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
Mon 8/10
11:50 am-7:20 pm
2 stops9h 30m
Portland
Thu 8/20
11:30 pm-10:30 am
1 stop9h 00m
$324
ChicagoPortland
ORD - PDX
ORDPDX
Chicago O'Hare Intl
Wed 10/21
2:17 pm-4:54 pm
Nonstop4h 37m
Portland
Sat 10/24
7:00 am-1:21 pm
Nonstop4h 21m
$325
ChicagoPortland
ORD - PDX
ORDPDX
Chicago O'Hare Intl
Tue 7/14
7:20 am-9:45 am
Nonstop4h 25m
Portland
Wed 7/22
10:59 pm-5:00 am
Nonstop4h 01m
$325
ChicagoPortland
ORD - PDX
ORDPDX
Chicago O'Hare Intl
Wed 7/22
5:00 am-9:47 am
1 stop6h 47m
Portland
Wed 7/29
10:40 pm-4:45 am
Nonstop4h 05m
$335
Quickest round-trip
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 8/22
8:40 am-11:28 am
Nonstop3h 48m
Boise Air Term. Gowen Fld
Wed 8/26
12:24 pm-5:02 pm
Nonstop3h 38m
$335
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Oregon
Have a flexible travel schedule? Discover the best time to fly to Oregon from Illinois with our price prediction graph.
STL-BOI
STL-PDX
MLI-PDX
ORD-PDX
ORD-EUG
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Illinois to Oregon
USIL-USOR
STL-BOI
STL-PDX
MLI-PDX
ORD-PDX
What is the cheapest month to book a flight from Illinois to Oregon?
Currently, May is the cheapest month in which you can book a flight from Illinois to Oregon (average of $115). Flying from Illinois to Oregon in September is currently the most expensive (average of $660). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from IL to OR?
Find hourly flight availability from Illinois to Oregon. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 25, 2026.
One of the essential ways to save on airfare from Illinois to Oregon is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 15% on airfare.
Weekly flight availability from Illinois to Oregon
Explore weekly flight availability from Illinois to Oregon. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 25, 2026.
The most flights from USIL to USOR are scheduled on a Wednesday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).
How much does it cost to fly round-trip from Illinois to Oregon?
How far ahead should I book a flight from Illinois to Oregon?
To ensure you get the cheapest price possible for a flight from Illinois to Oregon, you should look to book at least 63 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest day to fly from Illinois to Oregon?
Use this chart to determine the cheapest time to fly round-trip from Illinois to Oregon. Price data was last updated on June 20, 2026.
Travelers seeking maximum savings on their Illinois to Oregon flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Oregon
Get insights into the airlines that provide service to Oregon. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Oregon. Reviews last updated June 25, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, andDelta from Illinois to Oregon. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Boarding
8.1
Crew
8.5
Food
7.0
Comfort
7.8
Entertainment
7.0
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Related info for your journey
Find useful and relevant information for your journey from Illinois to Oregon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Return Flight Options
Top destinations
Alternative routes for Illinois to Oregon
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Oregon by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Oregon by cabin class
Find flights from Illinois to Oregon, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Oregon flights
Browse other Illinois and Oregon flight options. Last updated on June 25, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Oregon
Find the right flight back to Illinois after your stay in Oregon
Illinois to Oregon flights
Consider these flights traveling from Illinois to Oregon.
Top 8 airlines flying from Illinois to Oregon
Discover the top 8 airlines that operate flights from Illinois to Oregon. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$124 | Average$238 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$150 | Average$250 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$191 | Average$218 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$192 | Average$446 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$196 | Average$447 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$202 | Average$512 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$205 | Average$448 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$227 | Average$372 | FlexibilityNo cancel fee | On-time63% |