$139+ 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jun 27 — Jul 41
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 May 28, 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 28, 2026.
This United Airlines deal was found by Cheapflights users on 5/26. 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 9/125:00 am
ORD
- IDA
1 stop5h 53m
United Airlines
Wed 9/164:04 pm
IDA
- ORD
1 stop6h 55m
United Airlines
Deal found 5/26![United Airlines logo]()
$291
This Orbitz deal was found by Cheapflights users on 5/26. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:00 am
ORD
- GEG
1 stop8h 31m
Multiple Airlines
Wed 9/212:28 pm
GEG
- ORD
1 stop6h 25m
Multiple Airlines
Deal found 5/26![Multiple Airlines logo]()
$291
This American Airlines deal was found by Cheapflights users on 5/26. 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 8/2611:30 am
ORD
- GEG
Nonstop4h 07m
American Airlines
Wed 9/22:27 pm
GEG
- ORD
Nonstop4h 01m
American Airlines
Deal found 5/26![American Airlines logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 5/28. 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 8/66:00 am
ORD
- GEG
1 stop7h 00m
Alaska Airlines
Mon 8/1012:42 pm
GEG
- ORD
1 stop14h 18m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$301
This Travelocity deal was found by Cheapflights users on 5/25. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:00 am
ORD
- GEG
1 stop9h 22m
Alaska Airlines
Sat 11/213:20 pm
GEG
- ORD
1 stop6h 39m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$303
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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.
Sat 7/47:17 pm
ORD
- GEG
1 stop15h 09m
Alaska Airlines
Sat 7/117:41 pm
GEG
- ORD
1 stop7h 19m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$305
This American Airlines deal was found by Cheapflights users on 5/25. 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.
Tue 7/285:00 am
ORD
- GEG
1 stop8h 59m
American Airlines
Tue 8/42:29 pm
GEG
- ORD
Nonstop4h 03m
American Airlines
Deal found 5/25![American Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 5/28. 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 7/296:00 am
ORD
- GEG
1 stop8h 29m
Alaska Airlines
Sat 8/812:42 pm
GEG
- ORD
1 stop14h 18m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$308
This American Airlines deal was found by Cheapflights users on 5/24. 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.
Fri 9/1110:45 am
ORD
- IDA
Nonstop3h 43m
American Airlines
Thu 9/171:58 pm
IDA
- ORD
Nonstop3h 37m
American Airlines
Deal found 5/24![American Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 5/28. 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 5/28![American Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 5/26. 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.
Sat 9/125:00 am
ORD
- IDA
1 stop7h 45m
American Airlines
Wed 9/161:58 pm
IDA
- ORD
Nonstop3h 37m
American Airlines
Deal found 5/26![American Airlines logo]()
$311
This Alaska Airlines deal was found by Cheapflights users on 5/26. 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.
Sat 8/226:00 am
ORD
- GEG
1 stop7h 01m
Alaska Airlines
Sat 8/295:12 am
GEG
- ORD
1 stop6h 14m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$315
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 28, 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 28, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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.
Wed 7/298:20 pm
ORD
- GEG
1 stop14h 06m
Alaska Airlines
Sat 8/812:42 pm
GEG
- ORD
1 stop14h 18m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$308
This Delta deal was found by Cheapflights users on 5/26. 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 7/31:26 pm
MDW
- BOI
2 stops11h 43m
Delta
Tue 7/75:30 am
BOI
- MDW
2 stops11h 55m
Delta
Deal found 5/26![Delta logo]()
$345
This United Airlines deal was found by Cheapflights users on 5/25. 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 11/71:27 pm
STL
- BOI
2 stops8h 49m
United Airlines
Wed 11/1110:39 am
BOI
- STL
1 stop4h 47m
United Airlines
Deal found 5/25![United Airlines logo]()
$362
This Southwest deal was found by Cheapflights users on 5/26. 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 7/235:15 am
MDW
- BOI
1 stop5h 30m
Southwest
Tue 8/46:00 am
BOI
- MDW
1 stop8h 05m
Southwest
Deal found 5/26![Southwest logo]()
$365
This American Airlines deal was found by Cheapflights users on 5/24. 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.
Mon 8/35:32 am
STL
- BOI
1 stop6h 47m
American Airlines
Sat 8/88:01 am
BOI
- STL
1 stop8h 36m
American Airlines
Deal found 5/24![American Airlines logo]()
$446
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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.
Mon 8/106:20 am
ORD
- BOI
1 stop8h 26m
Alaska Airlines
Wed 8/124:21 pm
BOI
- ORD
1 stop6h 38m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$345
This Delta deal was found by Cheapflights users on 5/26. 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 7/48:36 am
ORD
- GEG
2 stops9h 35m
Delta
Sat 7/115:25 am
GEG
- ORD
1 stop6h 03m
Delta
Deal found 5/26![Delta logo]()
$350
This Southwest deal was found by Cheapflights users on 5/24. 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.
Fri 8/711:40 am
MDW
- BOI
Nonstop3h 30m
Southwest
Mon 8/1012:10 pm
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 5/24![Southwest logo]()
$375
This Delta deal was found by Cheapflights users on 5/27. 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.
Sat 9/125:30 am
ORD
- GEG
2 stops12h 34m
Delta
Thu 9/1710:50 pm
GEG
- ORD
2 stops12h 14m
Delta
Deal found 5/27![Delta logo]()
$351
This Alaska Airlines deal was found by Cheapflights users on 5/28. 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 8/68:20 pm
ORD
- BOI
1 stop14h 20m
Alaska Airlines
Sun 8/96:13 pm
BOI
- ORD
1 stop11h 07m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$355
This United Airlines deal was found by Cheapflights users on 5/26. 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.
Fri 7/244:21 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Tue 8/114:25 pm
JAC
- ORD
1 stop5h 21m
United Airlines
Deal found 5/26![United Airlines logo]()
$409
This Southwest deal was found by Cheapflights users on 5/23. 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 7/156:10 am
MDW
- BOI
1 stop8h 15m
Southwest
Tue 7/217:10 am
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 5/23![Southwest logo]()
$385
This Delta deal was found by Cheapflights users on 5/26. 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.
Thu 6/252:09 pm
ORD
- IDA
1 stop5h 08m
Delta
Tue 6/303:25 pm
IDA
- ORD
1 stop5h 32m
Delta
Deal found 5/26![Delta logo]()
$355
This Alaska Airlines deal was found by Cheapflights users on 5/24. 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 8/206:00 am
ORD
- BOI
1 stop9h 22m
Alaska Airlines
Sun 8/236:49 pm
BOI
- ORD
1 stop17h 33m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$355
This Delta deal was found by Cheapflights users on 5/25. 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 7/292:30 pm
STL
- JAC
1 stop6h 07m
Delta
Wed 8/56:01 pm
JAC
- STL
1 stop5h 40m
Delta
Deal found 5/25![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 5/23. 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.
Tue 6/236:00 am
MDW
- BOI
1 stop8h 25m
Southwest
Tue 6/304:05 pm
BOI
- MDW
1 stop5h 20m
Southwest
Deal found 5/23![Southwest logo]()
$395
This United Airlines deal was found by Cheapflights users on 5/26. 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.
Tue 10/68:00 am
STL
- BOI
2 stops10h 58m
United Airlines
Wed 10/75:44 pm
BOI
- STL
1 stop5h 01m
United Airlines
Deal found 5/26![United Airlines logo]()
$452
This Alaska Airlines deal was found by Cheapflights users on 5/23. 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 10/232:17 pm
ORD
- IDA
1 stop23h 49m
Alaska Airlines
Mon 10/261:46 pm
IDA
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 5/28. 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 7/48:00 am
STL
- JAC
1 stop5h 16m
Delta
Wed 7/86:05 pm
JAC
- STL
1 stop5h 36m
Delta
Deal found 5/28![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 5/23. 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 7/85:50 pm
MDW
- GEG
2 stops8h 00m
Southwest
Sun 7/121:55 pm
GEG
- MDW
1 stop13h 05m
Southwest
Deal found 5/23![Southwest logo]()
$396
This United Airlines deal was found by Cheapflights users on 5/28. 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 7/45:10 am
STL
- JAC
2 stops9h 38m
United Airlines
Wed 7/81:42 pm
JAC
- STL
1 stop6h 01m
United Airlines
Deal found 5/28![United Airlines logo]()
$452
This Alaska Airlines deal was found by Cheapflights users on 5/25. 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.
Sat 9/194:08 pm
ORD
- IDA
1 stop7h 48m
Alaska Airlines
Tue 9/226:18 am
IDA
- ORD
1 stop7h 36m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 5/23. 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.
Wed 7/157:55 pm
STL
- GEG
1 stop6h 00m
Delta
Tue 7/215:10 pm
GEG
- STL
1 stop5h 31m
Delta
Deal found 5/23![Delta logo]()
$363
This United Airlines deal was found by Cheapflights users on 5/23. 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 10/241:29 pm
STL
- BOI
2 stops9h 02m
United Airlines
Wed 10/2811:45 am
BOI
- STL
2 stops11h 49m
United Airlines
Deal found 5/23![United Airlines logo]()
$458
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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 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 5/27![Alaska Airlines logo]()
$381
This Southwest deal was found by Cheapflights users on 5/26. 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.
Tue 7/146:40 pm
MDW
- GEG
1 stop7h 10m
Southwest
Sun 7/196:40 pm
GEG
- MDW
1 stop13h 40m
Southwest
Deal found 5/26![Southwest logo]()
$429
This Delta deal was found by Cheapflights users on 5/25. 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.
Thu 7/97:06 pm
MDW
- BOI
1 stop5h 40m
Delta
Tue 7/145:30 am
BOI
- MDW
1 stop6h 39m
Delta
Deal found 5/25![Delta logo]()
$365
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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.
Mon 6/15:44 pm
ORD
- BOI
1 stop7h 14m
Alaska Airlines
Sat 6/134:27 pm
BOI
- ORD
1 stop6h 32m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$381
This Delta deal was found by Cheapflights users on 5/23. 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 6/237:37 pm
ORD
- BOI
1 stop5h 32m
Delta
Mon 6/291:05 pm
BOI
- ORD
1 stop7h 52m
Delta
Deal found 5/23![Delta logo]()
$365
This Southwest deal was found by Cheapflights users on 5/26. 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.
Tue 6/235:20 pm
STL
- BOI
2 stops8h 05m
Southwest
Tue 6/305:30 am
BOI
- STL
1 stop5h 50m
Southwest
Deal found 5/26![Southwest logo]()
$444
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated May 28, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated May 28, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 5/24. 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.
Fri 5/299:27 am
ORD
- GEG
Nonstop4h 21m
United Airlines
Fri 5/294:08 pm
GEG
- ORD
1 stop6h 36m
United Airlines
Deal found 5/24![United Airlines logo]()
$325
This Delta deal was found by Cheapflights users on 5/24. 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 5/297:12 am
ORD
- GEG
1 stop7h 01m
Delta
Fri 5/2910:40 pm
GEG
- ORD
1 stop9h 03m
Delta
Deal found 5/24![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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.
Wed 6/106:00 am
ORD
- BOI
1 stop7h 47m
Alaska Airlines
Tue 7/218:00 pm
BOI
- ORD
1 stop16h 21m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$339
This Gotogate deal was found by Cheapflights users on 5/25. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/168:08 pm
STL
- GEG
1 stop17h 28m
Frontier
Wed 6/2412:31 pm
GEG
- STL
1 stop28h 22m
Frontier
Deal found 5/25![Frontier logo]()
$320
This United Airlines deal was found by Cheapflights users on 5/23. 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.
Tue 6/169:29 am
ORD
- GEG
Nonstop4h 21m
United Airlines
Tue 6/234:08 pm
GEG
- ORD
1 stop6h 36m
United Airlines
Deal found 5/23![United Airlines logo]()
$321
This Expedia deal was found by Cheapflights users on 5/25. 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 6/195:42 pm
ORD
- BOI
1 stop7h 22m
Multiple Airlines
Tue 6/231:25 pm
BOI
- ORD
1 stop6h 18m
Multiple Airlines
Deal found 5/25![Multiple Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 5/26. 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 6/237:37 pm
ORD
- GEG
1 stop6h 22m
Delta
Tue 6/305:20 am
GEG
- ORD
2 stops9h 42m
Delta
Deal found 5/26![Delta logo]()
$322
This American Airlines deal was found by Cheapflights users on 5/24. 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.
Tue 6/235:00 am
ORD
- JAC
1 stop6h 27m
American Airlines
Tue 6/304:14 pm
JAC
- ORD
1 stop7h 25m
American Airlines
Deal found 5/24![American Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 5/26. 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.
Wed 6/247:35 am
ORD
- GEG
1 stop10h 13m
Delta
Sat 6/277:00 am
GEG
- ORD
1 stop8h 27m
Delta
Deal found 5/26![Delta logo]()
$336
This Travelocity deal was found by Cheapflights users on 5/26. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/257:20 am
ORD
- IDA
1 stop6h 46m
Alaska Airlines
Sun 6/284:14 pm
IDA
- ORD
1 stop11h 46m
Alaska Airlines
Deal found 5/26![Alaska Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Sun 6/285:00 am
ORD
- JAC
1 stop5h 46m
United Airlines
Thu 7/27:30 am
JAC
- ORD
Nonstop3h 10m
United Airlines
Deal found 5/25![United Airlines logo]()
$329
This Frontier deal was found by Cheapflights users on 5/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/297:38 pm
STL
- BOI
1 stop17h 52m
Frontier
Tue 7/71:24 pm
BOI
- STL
1 stop4h 59m
Frontier
Deal found 5/27![Frontier logo]()
$330
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 28, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated May 28, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/28. 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 7/86:00 am
ORD
- GEG
1 stop8h 29m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$139
This Alaska Airlines deal was found by Cheapflights users on 5/24. 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 11/173:59 pm
ORD
- IDA
1 stop8h 43m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$146
This CheapOair deal was found by Cheapflights users on 5/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 5/26![Frontier logo]()
$146
This Gotogate deal was found by Cheapflights users on 5/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/18:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Deal found 5/27![Frontier logo]()
$146
This Alaska Airlines deal was found by Cheapflights users on 5/25. 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.
Wed 11/187:00 am
ORD
- GEG
1 stop7h 45m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$146
This Alaska Airlines deal was found by Cheapflights users on 5/28. 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 7/216:00 am
ORD
- BOI
1 stop7h 26m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$148
This American Airlines deal was found by Cheapflights users on 5/26. 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 8/1911:30 am
ORD
- GEG
Nonstop4h 07m
American Airlines
Deal found 5/26![American Airlines logo]()
$149
This Alaska Airlines deal was found by Cheapflights users on 5/27. 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.
Thu 8/206:00 am
ORD
- GEG
1 stop8h 31m
Alaska Airlines
Deal found 5/27![Alaska Airlines logo]()
$151
This United Airlines deal was found by Cheapflights users on 5/25. 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.
Tue 7/218:40 am
ORD
- BOI
Nonstop3h 52m
United Airlines
Deal found 5/25![United Airlines logo]()
$158
This Alaska Airlines deal was found by Cheapflights users on 5/28. 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 11/217:00 am
ORD
- GEG
1 stop6h 42m
Alaska Airlines
Deal found 5/28![Alaska Airlines logo]()
$158
This Delta deal was found by Cheapflights users on 5/28. 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 6/248:36 am
ORD
- GEG
1 stop6h 42m
Delta
Deal found 5/28![Delta logo]()
$159
This Delta deal was found by Cheapflights users on 5/28. 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 7/217:06 pm
MDW
- GEG
1 stop6h 00m
Delta
Deal found 5/28![Delta logo]()
$159
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 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $291 (United Airlines) |
One-way from | $139 (Alaska Airlines) |
Popular in | November |
Cheapest in | February |
Average price | $414 |
Good round-trip deal | $380 or less |
Good one-way deal | $219 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 28, 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
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 7/29
8:20 pm-8:26 am
1 stop14h 06m
Spokane
Sat 8/8
12:42 pm-5:00 am
1 stop14h 18m
$308
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Fri 7/3
1:26 pm-12:09 am
2 stops11h 43m
Boise Air Term. Gowen Fld
Tue 7/7
5:30 am-6:25 pm
2 stops11h 55m
$345
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Mon 8/10
6:20 am-1:46 pm
1 stop8h 26m
Boise Air Term. Gowen Fld
Wed 8/12
4:21 pm-11:59 pm
1 stop6h 38m
$345
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 7/4
8:36 am-4:11 pm
2 stops9h 35m
Spokane
Sat 7/11
5:25 am-1:28 pm
1 stop6h 03m
$350
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 9/12
5:30 am-4:04 pm
2 stops12h 34m
Spokane
Thu 9/17
10:50 pm-1:04 pm
2 stops12h 14m
$351
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Thu 8/6
8:20 pm-9:40 am
1 stop14h 20m
Boise Air Term. Gowen Fld
Sun 8/9
6:13 pm-6:20 am
1 stop11h 07m
$355
ChicagoIdaho Falls
ORD - IDA
ORDIDA
Chicago O'Hare Intl
Thu 6/25
2:09 pm-6:17 pm
1 stop5h 08m
Idaho Falls Fanning Field
Tue 6/30
3:25 pm-9:57 pm
1 stop5h 32m
$355
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Thu 8/20
6:00 am-2:22 pm
1 stop9h 22m
Boise Air Term. Gowen Fld
Sun 8/23
6:49 pm-1:22 pm
1 stop17h 33m
$355
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 7/29
2:30 pm-7:37 pm
1 stop6h 07m
Jackson Hole
Wed 8/5
6:01 pm-12:41 am
1 stop5h 40m
$359
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Sat 7/4
8:00 am-12:16 pm
1 stop5h 16m
Jackson Hole
Wed 7/8
6:05 pm-12:41 am
1 stop5h 36m
$359
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-GEG
ORD-GEG
ORD-IDA
ORD-JAC
STL-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-GEG
ORD-GEG
ORD-IDA
ORD-JAC
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 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 28, 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 28, 2026.
The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 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.
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 28, 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
Crew
8.5
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Entertainment
7.0
Crew
8.5
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Entertainment
7.0
Crew
8.5
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Entertainment
7.0
Crew
8.5
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Entertainment
7.0
Crew
8.5
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
Entertainment
7.0
Crew
8.5
Comfort
7.8
Overall
7.9
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentEugene,Mar 2026
MFR - SEA
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.
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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 May 28, 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 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$180 | Average$390 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$263 | Average$519 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$446 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$285 | Average$405 | FlexibilityNo cancel fee | On-time63% |