$132+ 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 7/15. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jul 27 — Aug 31
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Idaho with Cheapflights
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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 June 27, 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 June 27, 2026.
This CheapOair deal was found by Cheapflights users on 6/27. 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
Tue 8/111:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 6/27![Frontier logo]()
$254
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.
Sat 8/229:00 am
ORD
- IDA
Nonstop3h 38m
United Airlines
Wed 8/262:25 pm
IDA
- ORD
1 stop6h 35m
United Airlines
Deal found 6/23![United Airlines logo]()
$294
This Delta deal was found by Cheapflights users on 6/26. 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 8/117:48 am
ORD
- IDA
1 stop7h 47m
Delta
Mon 8/1711:35 am
IDA
- ORD
1 stop5h 44m
Delta
Deal found 6/26![Delta logo]()
$310
This Delta deal was found by Cheapflights users on 6/27. 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 8/2212:36 pm
GEG
- MDW
1 stop8h 00m
Delta
Deal found 6/27![Delta logo]()
$317
This Delta deal was found by Cheapflights users on 6/27. 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 7/215:55 pm
ORD
- GEG
1 stop8h 00m
Delta
Sat 7/257:00 am
GEG
- ORD
1 stop6h 05m
Delta
Deal found 6/27![Delta logo]()
$317
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.
Mon 7/278:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Sun 8/21:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 6/22![Frontier logo]()
$318
This United Airlines deal was found by Cheapflights users on 6/26. 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 8/86:00 am
ORD
- GEG
1 stop8h 37m
United Airlines
Sat 8/153:54 pm
GEG
- ORD
1 stop6h 05m
United Airlines
Deal found 6/26![United Airlines logo]()
$320
This Southwest deal was found by Cheapflights users on 6/27. 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 8/178:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Wed 8/197:30 am
GEG
- MDW
2 stops9h 30m
Southwest
Deal found 6/27![Southwest logo]()
$321
This American Airlines deal was found by Cheapflights users on 6/26. 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 8/1211:30 am
ORD
- GEG
Nonstop4h 07m
American Airlines
Sat 8/152:27 pm
GEG
- ORD
Nonstop4h 01m
American Airlines
Deal found 6/26![American Airlines logo]()
$321
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/154:05 pm
MDW
- GEG
1 stop7h 20m
Southwest
Wed 8/197:30 am
GEG
- MDW
2 stops9h 30m
Southwest
Deal found 6/25![Southwest logo]()
$322
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/122:00 pm
ORD
- GEG
2 stops9h 16m
Delta
Sat 8/2212:36 pm
GEG
- ORD
1 stop9h 21m
Delta
Deal found 6/25![Delta logo]()
$322
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/138:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Tue 8/187:30 am
GEG
- MDW
2 stops9h 30m
Southwest
Deal found 6/25![Southwest logo]()
$324
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 June 27, 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 June 27, 2026.
This Delta deal was found by Cheapflights users on 6/26. 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 8/142:00 pm
ORD
- IDA
1 stop5h 20m
Delta
Sun 8/1611:35 am
IDA
- ORD
1 stop5h 44m
Delta
Deal found 6/26![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 6/27. 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 8/126:40 am
MDW
- BOI
2 stops8h 00m
Southwest
Tue 8/187:05 am
BOI
- MDW
2 stops9h 05m
Southwest
Deal found 6/27![Southwest logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 6/26. 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 9/32:18 pm
ORD
- GEG
1 stop10h 31m
Alaska Airlines
Sun 9/67:03 am
GEG
- ORD
1 stop10h 18m
Alaska Airlines
Deal found 6/26![Alaska Airlines logo]()
$338
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.
Sat 9/52:35 pm
ORD
- BOI
1 stop7h 49m
United Airlines
Sat 9/1212:28 pm
BOI
- ORD
Nonstop3h 37m
United Airlines
Deal found 6/23![United Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 6/26. 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 9/42:00 pm
ORD
- IDA
1 stop5h 20m
Delta
Mon 9/76:00 am
IDA
- ORD
1 stop4h 59m
Delta
Deal found 6/26![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 6/27. 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 8/296:35 am
MDW
- BOI
2 stops9h 55m
Southwest
Sat 9/54:05 pm
BOI
- MDW
2 stops11h 25m
Southwest
Deal found 6/27![Southwest logo]()
$337
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.
Tue 9/18:40 am
ORD
- BOI
Nonstop3h 48m
United Airlines
Tue 9/85:40 pm
BOI
- ORD
1 stop5h 19m
United Airlines
Deal found 6/22![United Airlines logo]()
$345
This Delta deal was found by Cheapflights users on 6/26. 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 9/127:45 am
ORD
- GEG
2 stops13h 30m
Delta
Thu 9/1711:10 am
GEG
- ORD
2 stops8h 42m
Delta
Deal found 6/26![Delta logo]()
$339
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.
Thu 10/226:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Sun 11/14:21 pm
BOI
- ORD
1 stop6h 36m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$375
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Fri 8/286:00 am
GEG
- MDW
Nonstop3h 30m
Southwest
Deal found 6/25![Southwest logo]()
$358
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/165:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Tue 7/214:14 pm
IDA
- ORD
1 stop7h 30m
United Airlines
Deal found 6/25![United Airlines logo]()
$370
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.
Sun 10/186:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Sun 11/11:51 pm
BOI
- ORD
1 stop9h 06m
Alaska Airlines
Deal found 6/24![Alaska Airlines logo]()
$375
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.
Fri 7/33:22 pm
ORD
- GEG
1 stop8h 12m
Delta
Tue 7/147:08 pm
GEG
- ORD
2 stops10h 51m
Delta
Deal found 6/22![Delta logo]()
$341
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/126:40 am
MDW
- GEG
2 stops8h 25m
Southwest
Mon 8/176:55 am
GEG
- MDW
2 stops8h 05m
Southwest
Deal found 6/25![Southwest logo]()
$359
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:00 am
ORD
- GEG
1 stop7h 37m
Alaska Airlines
Sun 9/136:00 am
GEG
- ORD
1 stop11h 21m
Alaska Airlines
Deal found 6/25![Alaska Airlines logo]()
$375
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.
Fri 7/31:49 pm
MDW
- GEG
1 stop7h 37m
Delta
Tue 7/145:20 am
GEG
- MDW
2 stops10h 58m
Delta
Deal found 6/22![Delta logo]()
$341
This United Airlines deal was found by Cheapflights users on 6/26. 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.
Mon 8/101:38 pm
STL
- BOI
2 stops9h 15m
United Airlines
Sat 8/152:44 pm
BOI
- STL
1 stop5h 02m
United Airlines
Deal found 6/26![United Airlines logo]()
$393
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:55 am
MDW
- BOI
1 stop6h 20m
Southwest
Sat 8/227:45 am
BOI
- MDW
2 stops9h 40m
Southwest
Deal found 6/25![Southwest logo]()
$360
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.
Thu 9/106:24 pm
ORD
- GEG
1 stop6h 30m
Delta
Thu 9/245:10 am
GEG
- ORD
2 stops10h 51m
Delta
Deal found 6/23![Delta logo]()
$346
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/178:20 pm
ORD
- BOI
1 stop14h 20m
Alaska Airlines
Fri 7/244:27 pm
BOI
- ORD
1 stop6h 32m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$387
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 8/17:35 pm
STL
- BOI
1 stop5h 55m
Southwest
Wed 8/53:40 pm
BOI
- STL
1 stop5h 55m
Southwest
Deal found 6/24![Southwest logo]()
$363
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.
Sat 9/195:00 am
ORD
- IDA
1 stop5h 53m
United Airlines
Tue 9/224:04 pm
IDA
- ORD
1 stop5h 42m
United Airlines
Deal found 6/22![United Airlines logo]()
$400
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.
Wed 9/27:00 am
ORD
- BOI
1 stop9h 18m
Delta
Sun 9/66:49 am
BOI
- ORD
1 stop9h 09m
Delta
Deal found 6/22![Delta logo]()
$350
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:35 am
STL
- BOI
1 stop8h 47m
Alaska Airlines
Wed 8/266:23 am
BOI
- STL
1 stop6h 43m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$388
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.
Wed 8/2610:20 am
MDW
- GEG
1 stop7h 55m
Southwest
Sun 8/306:45 pm
GEG
- MDW
1 stop9h 00m
Southwest
Deal found 6/23![Southwest logo]()
$366
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.
Tue 8/115:00 am
ORD
- IDA
1 stop5h 51m
United Airlines
Mon 8/174:04 pm
IDA
- ORD
1 stop6h 55m
United Airlines
Deal found 6/22![United Airlines logo]()
$406
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.
Sat 9/59:59 am
MDW
- BOI
2 stops8h 53m
Delta
Sat 9/122:11 pm
BOI
- MDW
1 stop7h 34m
Delta
Deal found 6/23![Delta logo]()
$355
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:08 pm
STL
- GEG
1 stop7h 03m
Alaska Airlines
Wed 8/265:52 am
GEG
- STL
1 stop6h 14m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$403
This Southwest deal was found by Cheapflights users on 6/26. 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 8/146:15 am
MDW
- GEG
2 stops11h 20m
Southwest
Sat 8/2212:45 pm
GEG
- MDW
1 stop6h 00m
Southwest
Deal found 6/26![Southwest logo]()
$369
This United Airlines deal was found by Cheapflights users on 6/27. 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 11/62:18 pm
ORD
- JAC
1 stop7h 44m
United Airlines
Mon 11/94:25 pm
JAC
- ORD
1 stop5h 19m
United Airlines
Deal found 6/27![United Airlines logo]()
$411
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated June 27, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated June 27, 2026 and is based on user searches.
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/185:55 pm
ORD
- GEG
1 stop7h 03m
Delta
Tue 7/217:59 pm
GEG
- ORD
2 stops10h 31m
Delta
Deal found 6/25![Delta logo]()
$322
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.
Sat 7/189:57 pm
ORD
- BOI
1 stop15h 32m
Multiple Airlines
Fri 7/244:27 pm
BOI
- ORD
1 stop6h 32m
Multiple Airlines
Deal found 6/22![Multiple Airlines logo]()
$342
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:00 am
ORD
- GEG
1 stop8h 37m
United Airlines
Tue 7/214:13 pm
GEG
- ORD
1 stop6h 31m
United Airlines
Deal found 6/25![United Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 6/27. 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 7/215:55 pm
ORD
- GEG
1 stop8h 00m
Delta
Sat 7/257:00 am
GEG
- ORD
1 stop6h 05m
Delta
Deal found 6/27![Delta logo]()
$317
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.
Tue 7/218:20 pm
ORD
- GEG
1 stop14h 06m
Alaska Airlines
Sat 7/2512:42 pm
GEG
- ORD
1 stop14h 18m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$336
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.
Sat 7/255:00 pm
ORD
- GEG
1 stop9h 02m
Delta
Sat 8/85:15 am
GEG
- ORD
1 stop6h 08m
Delta
Deal found 6/23![Delta logo]()
$329
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.
Sat 7/255:25 am
MDW
- BOI
1 stop5h 20m
Southwest
Wed 7/293:00 pm
BOI
- MDW
1 stop7h 45m
Southwest
Deal found 6/22![Southwest logo]()
$355
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.
Mon 7/278:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Sun 8/21:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 6/22![Frontier logo]()
$318
This CheapOair deal was found by Cheapflights users on 6/27. 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
Tue 8/111:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 6/27![Frontier logo]()
$254
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.
Wed 7/2911:30 am
ORD
- GEG
Nonstop4h 09m
American Airlines
Sat 8/82:27 pm
GEG
- ORD
Nonstop4h 01m
American Airlines
Deal found 6/24![American Airlines logo]()
$346
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:20 pm
ORD
- BOI
1 stop14h 17m
Alaska Airlines
Sat 8/88:00 pm
BOI
- ORD
1 stop16h 21m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$345
This American Airlines deal was found by Cheapflights users on 6/26. 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 7/3111:30 am
ORD
- BOI
Nonstop3h 50m
American Airlines
Sat 8/82:58 pm
BOI
- ORD
Nonstop3h 51m
American Airlines
Deal found 6/26![American Airlines logo]()
$351
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 June 27, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated June 27, 2026.
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 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.
Thu 9/241:02 pm
ORD
- BOI
1 stop26h 55m
Frontier
Deal found 6/25![Frontier logo]()
$144
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.
Wed 7/299:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 6/25![Frontier logo]()
$146
This American Airlines deal was found by Cheapflights users on 6/27. 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 8/2511:30 am
ORD
- GEG
Nonstop4h 07m
American Airlines
Deal found 6/27![American Airlines logo]()
$146
This Southwest deal was found by Cheapflights users on 6/26. 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 9/248:50 pm
MDW
- GEG
Nonstop3h 50m
Southwest
Deal found 6/26![Southwest logo]()
$146
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.
Mon 8/108:08 pm
STL
- BOI
1 stop17h 21m
Frontier
Deal found 6/25![Frontier logo]()
$148
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 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.
Wed 7/2911:30 am
ORD
- GEG
Nonstop4h 09m
American Airlines
Deal found 6/24![American Airlines logo]()
$149
This Alaska Airlines deal was found by Cheapflights users on 6/27. 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 9/227:20 am
ORD
- BOI
1 stop7h 42m
Alaska Airlines
Deal found 6/27![Alaska Airlines logo]()
$150
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 June 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $254 (CheapOair) |
One-way from | $132 (Mytrip) |
Popular in | June |
Cheapest in | February |
Average price | $469 |
Good round-trip deal | $345 or less |
Good one-way deal | $225 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 June 27, 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
Fri 8/14
2:00 pm-6:20 pm
1 stop5h 20m
Idaho Falls Fanning Field
Sun 8/16
11:35 am-6:19 pm
1 stop5h 44m
$329
ChicagoIdaho Falls
ORD - IDA
ORDIDA
Chicago O'Hare Intl
Fri 9/4
2:00 pm-6:20 pm
1 stop5h 20m
Idaho Falls Fanning Field
Mon 9/7
6:00 am-11:59 am
1 stop4h 59m
$329
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Wed 8/12
6:40 am-1:40 pm
2 stops8h 00m
Boise Air Term. Gowen Fld
Tue 8/18
7:05 am-5:10 pm
2 stops9h 05m
$337
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Sat 8/29
6:35 am-3:30 pm
2 stops9h 55m
Boise Air Term. Gowen Fld
Sat 9/5
4:05 pm-4:30 am
2 stops11h 25m
$337
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Thu 9/3
2:18 pm-10:49 pm
1 stop10h 31m
Spokane
Sun 9/6
7:03 am-7:21 pm
1 stop10h 18m
$338
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 9/12
7:45 am-7:15 pm
2 stops13h 30m
Spokane
Thu 9/17
11:10 am-9:52 pm
2 stops8h 42m
$339
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 9/5
2:35 pm-9:24 pm
1 stop7h 49m
Boise Air Term. Gowen Fld
Sat 9/12
12:28 pm-5:05 pm
Nonstop3h 37m
$340
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 7/3
3:22 pm-9:34 pm
1 stop8h 12m
Spokane
Tue 7/14
7:08 pm-7:59 am
2 stops10h 51m
$341
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Fri 7/3
1:49 pm-7:26 pm
1 stop7h 37m
Spokane
Tue 7/14
5:20 am-6:18 pm
2 stops10h 58m
$341
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Tue 9/1
8:40 am-11:28 am
Nonstop3h 48m
Boise Air Term. Gowen Fld
Tue 9/8
5:40 pm-11:59 pm
1 stop5h 19m
$345
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-IDA
MDW-GEG
ORD-GEG
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-IDA
MDW-GEG
ORD-GEG
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, July is the cheapest month in which you can book a flight from Illinois to Idaho (average of $91). Flying from Illinois to Idaho in June is currently the most expensive (average of $279). 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 June 27, 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 June 27, 2026.
The most flights from USIL to USID are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (5 on average).
How much does it cost to fly round-trip from Illinois to Idaho?
How far ahead should I book a flight from Illinois to Idaho?
The best time to book flights from Illinois to Idaho is 62 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.
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 June 27, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, 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
7.0
Food
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Food
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Food
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Food
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Food
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
Entertainment
7.0
Food
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
4.0
OkayAnonymous,Jun 2026
SEA - RNO
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.
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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 June 27, 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 5 airlines flying from Illinois to Idaho
Discover the top 5 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 June 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$263 | Average$488 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$459 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$403 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$288 | Average$439 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$364 | FlexibilityNo cancel fee | On-time75% |