$116+ Cheap flights from Illinois to Idaho
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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jun 13 — Jun 201
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Illinois to Idaho 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 Idaho
Cheapest
Best
Last-minute
One-way
Cheapest flights from Illinois to IdahoExplore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 14, 2026.
Explore the most affordable flight options available from Illinois to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 14, 2026.
This CheapOair deal was found by Cheapflights users on 5/10. 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 6/178:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Sun 6/211:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/10![Frontier logo]()
$240
This Gotogate deal was found by Cheapflights users on 5/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Fri 6/512:33 pm
GEG
- ORD
1 stop5h 59m
Frontier
Deal found 5/11![Frontier logo]()
$261
This Booking.com deal was found by Cheapflights users on 5/12. 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.
Thu 6/117:38 pm
STL
- GEG
1 stop17h 58m
Frontier
Wed 6/1712:31 pm
GEG
- STL
1 stop28h 22m
Frontier
Deal found 5/12![Frontier logo]()
$262
This American Airlines deal was found by Cheapflights users on 5/11. 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.
Tue 10/209:40 am
ORD
- IDA
Nonstop3h 40m
American Airlines
Sat 10/241:43 pm
IDA
- ORD
Nonstop3h 17m
American Airlines
Deal found 5/11![American Airlines logo]()
$271
This CheapOair deal was found by Cheapflights users on 5/10. 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 6/88:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Sun 6/141:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/10![Frontier logo]()
$280
This Booking.com deal was found by Cheapflights users on 5/10. 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.
Thu 6/49:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Mon 6/812:33 pm
GEG
- ORD
1 stop5h 59m
Frontier
Deal found 5/10![Frontier logo]()
$282
This Expedia deal was found by Cheapflights users on 5/12. 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.
Sat 6/65:52 pm
ORD
- GEG
1 stop6h 44m
Multiple Airlines
Mon 6/812:33 pm
GEG
- ORD
1 stop5h 59m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$288
This United Airlines deal was found by Cheapflights users on 5/11. 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 8/45:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 8/85:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/11![United Airlines logo]()
$291
This Booking.com deal was found by Cheapflights users on 5/13. 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.
Thu 5/289:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Mon 6/112:33 pm
GEG
- ORD
1 stop5h 59m
Frontier
Deal found 5/13![Frontier logo]()
$301
This United Airlines deal was found by Cheapflights users on 5/11. 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 10/35:00 am
ORD
- IDA
1 stop5h 53m
United Airlines
Tue 10/65:53 pm
IDA
- ORD
1 stop5h 04m
United Airlines
Deal found 5/11![United Airlines logo]()
$306
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/39:00 am
ORD
- GEG
1 stop14h 45m
Alaska Airlines
Sat 6/61:59 pm
GEG
- ORD
1 stop7h 00m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$308
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 11/113:59 pm
ORD
- IDA
1 stop8h 43m
Alaska Airlines
Sat 11/141:53 pm
IDA
- ORD
1 stop9h 04m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$310
Best flights from Illinois to IdahoDiscover carefully curated flight deals from Illinois to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 14, 2026.
Discover carefully curated flight deals from Illinois to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 14, 2026.
This United Airlines deal was found by Cheapflights users on 5/9. 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 6/65:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 6/135:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/9![United Airlines logo]()
$310
This Alaska Airlines deal was found by Cheapflights users on 5/14. 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 8/227:00 am
ORD
- GEG
1 stop6h 52m
Alaska Airlines
Sat 8/2912:46 pm
GEG
- ORD
1 stop8h 55m
Alaska Airlines
Deal found 5/14![Alaska Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 5/13. 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 7/118:27 am
ORD
- BOI
2 stops8h 46m
Delta
Wed 7/2211:53 am
BOI
- ORD
1 stop6h 04m
Delta
Deal found 5/13![Delta logo]()
$340
This Southwest deal was found by Cheapflights users on 5/10. 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.
Wed 9/96:00 pm
MDW
- BOI
1 stop6h 10m
Southwest
Wed 9/307:05 am
BOI
- MDW
1 stop6h 40m
Southwest
Deal found 5/10![Southwest logo]()
$355
This Kiwi.com deal was found by Cheapflights users on 5/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/89:06 pm
STL
- BOI
2 stops16h 24m
Frontier
Sun 6/141:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/9![Frontier logo]()
$438
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 8/296:00 am
ORD
- GEG
1 stop8h 30m
Alaska Airlines
Tue 9/15:09 am
GEG
- ORD
1 stop6h 17m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 5/11. 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 6/243:55 pm
ORD
- BOI
2 stops9h 14m
Delta
Tue 6/3011:59 am
BOI
- ORD
1 stop5h 59m
Delta
Deal found 5/11![Delta logo]()
$350
This United Airlines deal was found by Cheapflights users on 5/12. 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 7/85:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Mon 7/135:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/12![United Airlines logo]()
$352
This Southwest deal was found by Cheapflights users on 5/10. 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 7/46:10 am
MDW
- BOI
1 stop6h 20m
Southwest
Sat 7/1110:25 am
BOI
- MDW
1 stop6h 50m
Southwest
Deal found 5/10![Southwest logo]()
$365
This Delta deal was found by Cheapflights users on 5/11. 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 7/295:54 pm
ORD
- GEG
2 stops8h 01m
Delta
Sat 8/81:20 pm
GEG
- ORD
1 stop6h 00m
Delta
Deal found 5/11![Delta logo]()
$353
This United Airlines deal was found by Cheapflights users on 5/11. 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 5/261:13 pm
STL
- JAC
1 stop6h 29m
United Airlines
Sat 5/301:42 pm
JAC
- STL
1 stop6h 15m
United Airlines
Deal found 5/11![United Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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.
Thu 5/285:44 pm
ORD
- BOI
1 stop7h 14m
Alaska Airlines
Mon 6/16:07 pm
BOI
- ORD
1 stop11h 13m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 5/13. 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 9/2111:40 am
MDW
- BOI
Nonstop3h 30m
Southwest
Mon 9/2812:10 pm
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 5/13![Southwest logo]()
$373
This Delta deal was found by Cheapflights users on 5/10. 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 6/35:41 pm
ORD
- GEG
2 stops7h 54m
Delta
Sat 6/66:49 am
GEG
- ORD
1 stop8h 02m
Delta
Deal found 5/10![Delta logo]()
$353
This United Airlines deal was found by Cheapflights users on 5/9. 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 6/105:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Wed 6/175:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/9![United Airlines logo]()
$360
This Southwest deal was found by Cheapflights users on 5/10. 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.
Tue 6/26:05 pm
MDW
- GEG
1 stop7h 20m
Southwest
Tue 6/912:35 pm
GEG
- MDW
1 stop7h 50m
Southwest
Deal found 5/10![Southwest logo]()
$373
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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.
Fri 10/23:52 pm
ORD
- IDA
1 stop8h 04m
Alaska Airlines
Fri 10/91:46 pm
IDA
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 5/11. 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 8/127:25 pm
MDW
- GEG
1 stop5h 44m
Delta
Sat 8/225:36 am
GEG
- MDW
2 stops10h 25m
Delta
Deal found 5/11![Delta logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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 8/222:22 pm
ORD
- IDA
1 stop23h 44m
Alaska Airlines
Sat 8/291:45 pm
IDA
- ORD
1 stop9h 14m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 5/12. 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.
Thu 8/208:40 am
ORD
- BOI
Nonstop3h 48m
United Airlines
Sun 8/2312:24 pm
BOI
- ORD
Nonstop3h 39m
United Airlines
Deal found 5/12![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 5/13. 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.
Fri 6/125:15 am
MDW
- BOI
1 stop5h 30m
Southwest
Tue 6/163:00 pm
BOI
- MDW
1 stop7h 35m
Southwest
Deal found 5/13![Southwest logo]()
$375
This Delta deal was found by Cheapflights users on 5/13. 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 5/299:23 am
MDW
- GEG
1 stop5h 48m
Delta
Sat 6/66:49 am
GEG
- MDW
2 stops12h 20m
Delta
Deal found 5/13![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 5/10. 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.
Tue 6/236:55 pm
MDW
- GEG
1 stop7h 10m
Southwest
Mon 6/291:30 pm
GEG
- MDW
2 stops8h 45m
Southwest
Deal found 5/10![Southwest logo]()
$378
This United Airlines deal was found by Cheapflights users on 5/10. 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 7/75:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 7/115:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/10![United Airlines logo]()
$381
This Alaska Airlines deal was found by Cheapflights users on 5/12. 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 8/185:37 pm
STL
- GEG
1 stop7h 22m
Alaska Airlines
Wed 8/195:45 am
GEG
- STL
1 stop6h 19m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$384
This Delta deal was found by Cheapflights users on 5/10. 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 7/152:07 pm
ORD
- GEG
2 stops10h 59m
Delta
Mon 7/205:10 pm
GEG
- ORD
2 stops12h 49m
Delta
Deal found 5/10![Delta logo]()
$358
This Southwest deal was found by Cheapflights users on 5/12. 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 8/208:50 am
MDW
- BOI
1 stop6h 25m
Southwest
Sun 8/2312:30 pm
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 5/12![Southwest logo]()
$380
This Delta deal was found by Cheapflights users on 5/12. 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 5/297:12 am
ORD
- GEG
1 stop7h 01m
Delta
Sat 6/69:55 am
GEG
- ORD
2 stops12h 13m
Delta
Deal found 5/12![Delta logo]()
$360
This United Airlines deal was found by Cheapflights users on 5/13. 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 6/37:05 am
ORD
- IDA
1 stop7h 20m
United Airlines
Wed 6/105:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/13![United Airlines logo]()
$400
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 8/256:00 am
STL
- BOI
1 stop7h 35m
Alaska Airlines
Wed 8/266:20 am
BOI
- STL
1 stop6h 44m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$403
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated May 14, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated May 14, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 5/12. 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.
Wed 5/272:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Thu 5/2812:46 pm
GEG
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 5/12![Alaska Airlines logo]()
$315
This Booking.com deal was found by Cheapflights users on 5/13. 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.
Thu 5/289:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Mon 6/112:33 pm
GEG
- ORD
1 stop5h 59m
Frontier
Deal found 5/13![Frontier logo]()
$301
This Gotogate deal was found by Cheapflights users on 5/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/29:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Fri 6/512:33 pm
GEG
- ORD
1 stop5h 59m
Frontier
Deal found 5/11![Frontier logo]()
$261
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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 6/26:00 am
ORD
- GEG
1 stop7h 42m
Alaska Airlines
Tue 6/95:00 am
GEG
- ORD
1 stop6h 22m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$323
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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 6/25:44 pm
ORD
- GEG
1 stop8h 15m
Alaska Airlines
Thu 6/412:46 pm
GEG
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$325
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 6/39:00 am
ORD
- GEG
1 stop14h 45m
Alaska Airlines
Sat 6/61:59 pm
GEG
- ORD
1 stop7h 00m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$308
This Booking.com deal was found by Cheapflights users on 5/10. 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.
Thu 6/49:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Mon 6/812:33 pm
GEG
- ORD
1 stop5h 59m
Frontier
Deal found 5/10![Frontier logo]()
$282
This Expedia deal was found by Cheapflights users on 5/12. 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.
Sat 6/65:52 pm
ORD
- GEG
1 stop6h 44m
Multiple Airlines
Mon 6/812:33 pm
GEG
- ORD
1 stop5h 59m
Multiple Airlines
Deal found 5/12![Multiple Airlines logo]()
$288
This United Airlines deal was found by Cheapflights users on 5/9. 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 6/65:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 6/135:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 5/9![United Airlines logo]()
$310
This CheapOair deal was found by Cheapflights users on 5/10. 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 6/88:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Sun 6/141:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/10![Frontier logo]()
$280
This Booking.com deal was found by Cheapflights users on 5/12. 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.
Thu 6/117:38 pm
STL
- GEG
1 stop17h 58m
Frontier
Wed 6/1712:31 pm
GEG
- STL
1 stop28h 22m
Frontier
Deal found 5/12![Frontier logo]()
$262
This CheapOair deal was found by Cheapflights users on 5/10. 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 6/178:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Sun 6/211:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/10![Frontier logo]()
$240
One-way flights from Illinois to IdahoSearch for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated May 14, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated May 14, 2026.
This CheapOair deal was found by Cheapflights users on 5/12. 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 6/39:37 pm
ORD
- BOI
1 stop16h 01m
Frontier
Deal found 5/12![Frontier logo]()
$116
This Booking.com deal was found by Cheapflights users on 5/12. 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.
Mon 8/249:48 pm
ORD
- BOI
1 stop15h 21m
Frontier
Deal found 5/12![Frontier logo]()
$130
This Mytrip deal was found by Cheapflights users on 5/10. 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.
Mon 6/19:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 5/10![Frontier logo]()
$135
This Mytrip deal was found by Cheapflights users on 5/10. 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.
Tue 6/29:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Deal found 5/10![Frontier logo]()
$135
This Booking.com deal was found by Cheapflights users on 5/12. 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.
Sun 8/98:08 pm
STL
- GEG
1 stop17h 29m
Frontier
Deal found 5/12![Frontier logo]()
$136
This CheapOair deal was found by Cheapflights users on 5/11. 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 8/38:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Deal found 5/11![Frontier logo]()
$136
This CheapOair deal was found by Cheapflights users on 5/13. 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 6/69:37 pm
ORD
- BOI
1 stop16h 01m
Frontier
Deal found 5/13![Frontier logo]()
$136
This Booking.com deal was found by Cheapflights users on 5/12. 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.
Mon 7/69:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 5/12![Frontier logo]()
$137
This Trip.com deal was found by Cheapflights users on 5/9. 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.
Sat 5/239:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 5/9![Frontier logo]()
$144
This Trip.com deal was found by Cheapflights users on 5/11. 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.
Sun 5/319:37 pm
ORD
- GEG
1 stop16h 01m
Frontier
Deal found 5/11![Frontier logo]()
$145
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 11/107:00 am
ORD
- IDA
1 stop9h 17m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$146
This Alaska Airlines deal was found by Cheapflights users on 5/13. 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 11/72:07 pm
ORD
- BOI
1 stop6h 56m
Alaska Airlines
Deal found 5/13![Alaska Airlines logo]()
$148
Find flight deals from Illinois to Idaho
Keep the following information in mind while searching for Illinois to Idaho flight deals. Data was last updated May 14, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $240 (CheapOair) |
One-way from | $116 (CheapOair) |
Popular in | November |
Cheapest in | February |
Average price | $409 |
Good round-trip deal | $375 or less |
Good one-way deal | $222 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Idaho 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 May 14, 2026.
Use the filters below to find and compare flights from Illinois to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoIdaho Falls
ORD - IDA
ORDIDA
Chicago O'Hare Intl
Sat 6/6
5:00 am-9:50 am
1 stop5h 50m
Idaho Falls Fanning Field
Sat 6/13
5:54 pm-12:44 am
1 stop5h 50m
$310
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 8/22
7:00 am-11:52 am
1 stop6h 52m
Spokane
Sat 8/29
12:46 pm-11:41 pm
1 stop8h 55m
$315
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 8/29
6:00 am-12:30 pm
1 stop8h 30m
Spokane
Tue 9/1
5:09 am-1:26 pm
1 stop6h 17m
$315
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 7/11
8:27 am-4:13 pm
2 stops8h 46m
Boise Air Term. Gowen Fld
Wed 7/22
11:53 am-6:57 pm
1 stop6h 04m
$340
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 6/24
3:55 pm-12:09 am
2 stops9h 14m
Boise Air Term. Gowen Fld
Tue 6/30
11:59 am-6:58 pm
1 stop5h 59m
$350
ChicagoIdaho Falls
ORD - IDA
ORDIDA
Chicago O'Hare Intl
Wed 7/8
5:00 am-9:50 am
1 stop5h 50m
Idaho Falls Fanning Field
Mon 7/13
5:54 pm-12:44 am
1 stop5h 50m
$352
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 7/29
5:54 pm-11:55 pm
2 stops8h 01m
Spokane
Sat 8/8
1:20 pm-9:20 pm
1 stop6h 00m
$353
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 6/3
5:41 pm-11:35 pm
2 stops7h 54m
Spokane
Sat 6/6
6:49 am-4:51 pm
1 stop8h 02m
$353
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Wed 8/12
7:25 pm-11:09 pm
1 stop5h 44m
Spokane
Sat 8/22
5:36 am-6:01 pm
2 stops10h 25m
$353
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Wed 9/9
6:00 pm-11:10 pm
1 stop6h 10m
Boise Air Term. Gowen Fld
Wed 9/30
7:05 am-2:45 pm
1 stop6h 40m
$355
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from Illinois with our price prediction graph.
STL-BOI
ORD-GEG
STL-GEG
ORD-IDA
ORD-BOI
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 Idaho
USIL-USID
STL-BOI
ORD-GEG
STL-GEG
ORD-IDA
How far ahead should I book a flight from Illinois to Idaho?
The best time to book flights from Illinois to Idaho is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, May is the cheapest month in which you can book a flight from Illinois to Idaho (average of $87). Flying from Illinois to Idaho in March is currently the most expensive (average of $268). 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 ID?
Find hourly flight availability from Illinois to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 14, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 29% on the flight price compared to flying in the afternoon, which is usually more expensive.
Weekly flight availability from Illinois to Idaho
Explore weekly flight availability from Illinois to Idaho. 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 May 14, 2026.
The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Illinois to Idaho?
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated May 14, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, andDelta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Comfort
8.0
Overall
8.0
Food
7.0
Crew
8.6
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. 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 Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Idaho by cabin class
Find flights from Illinois to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Idaho flights
Browse other Illinois and Idaho flight options. Last updated on May 14, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Find a return flight route from Idaho
Find the right flight back to Illinois after your stay in Idaho
Illinois to Idaho flights
Consider these flights traveling from Illinois to Idaho.
Top 4 airlines flying from Illinois to Idaho
Discover the top 4 airlines that operate flights from Illinois to Idaho. 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 May 14, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$345 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$254 | Average$378 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$256 | Average$485 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$444 | FlexibilityNo cancel fee | On-time71% |