$109+ 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 5/13. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Jun 1 — Jun 81
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 2, 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 2, 2026.
This Expedia deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/26:00 am
ORD
- GEG
1 stop7h 42m
Multiple Airlines
Wed 6/312:33 pm
GEG
- ORD
1 stop5h 59m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$244
This Expedia deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 6/27:49 pm
ORD
- BOI
1 stop16h 14m
Multiple Airlines
Tue 6/91:25 pm
BOI
- ORD
1 stop6h 18m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$258
This CheapOair deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/108:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Sun 6/141:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/1![Frontier logo]()
$261
This American Airlines deal was found by Cheapflights users on 4/28. 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 9/309:40 am
ORD
- IDA
Nonstop3h 32m
American Airlines
Wed 10/71:43 pm
IDA
- ORD
Nonstop3h 17m
American Airlines
Deal found 4/28![American Airlines logo]()
$271
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 6/22:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Wed 6/37:01 am
GEG
- ORD
1 stop9h 49m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$277
This CheapOair deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/249:48 pm
ORD
- BOI
1 stop15h 42m
Frontier
Tue 6/301:25 pm
BOI
- ORD
1 stop6h 18m
Frontier
Deal found 5/1![Frontier logo]()
$281
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 6/15:27 pm
STL
- BOI
2 stops20h 03m
Frontier
Tue 6/91:25 pm
BOI
- STL
1 stop28h 58m
Frontier
Deal found 4/29![Frontier logo]()
$281
This Expedia deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 8/87:20 am
ORD
- GEG
1 stop6h 25m
Multiple Airlines
Mon 8/1712:32 pm
GEG
- ORD
1 stop6h 20m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 6/25:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 6/135:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 4/30![United Airlines logo]()
$291
This Travelocity deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Fri 9/116:00 am
ORD
- BOI
1 stop7h 35m
Multiple Airlines
Tue 9/1512:59 pm
BOI
- ORD
1 stop7h 36m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$293
This Expedia deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 7/142:20 pm
ORD
- GEG
1 stop10h 47m
Multiple Airlines
Mon 7/2012:32 pm
GEG
- ORD
1 stop6h 20m
Multiple Airlines
Deal found 4/30![Multiple Airlines logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/287:49 pm
ORD
- BOI
1 stop16h 14m
Alaska Airlines
Sat 5/308:51 pm
BOI
- ORD
1 stop8h 29m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$295
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 2, 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 2, 2026.
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Wed 9/305:00 am
ORD
- IDA
1 stop5h 53m
United Airlines
Wed 10/74:04 pm
IDA
- ORD
1 stop6h 53m
United Airlines
Deal found 4/28![United Airlines logo]()
$291
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/292:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Sat 6/61:59 pm
GEG
- ORD
1 stop8h 00m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$295
This Delta deal was found by Cheapflights users on 4/28. 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 5/267:13 pm
MDW
- GEG
1 stop5h 53m
Delta
Tue 6/210:40 pm
GEG
- MDW
1 stop9h 20m
Delta
Deal found 4/28![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 4/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/22:40 pm
MDW
- BOI
Nonstop3h 35m
Southwest
Sat 7/41:55 pm
BOI
- MDW
1 stop5h 15m
Southwest
Deal found 4/28![Southwest logo]()
$377
This American Airlines deal was found by Cheapflights users on 4/27. 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 6/305:29 am
STL
- BOI
1 stop5h 59m
American Airlines
Tue 7/73:10 pm
BOI
- STL
1 stop8h 06m
American Airlines
Deal found 4/27![American Airlines logo]()
$395
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/237:13 pm
MDW
- GEG
1 stop5h 53m
Delta
Tue 5/2610:40 pm
GEG
- MDW
1 stop9h 20m
Delta
Deal found 4/29![Delta logo]()
$326
This Alaska Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 8/88:15 am
GEG
- ORD
1 stop9h 22m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$335
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/95:00 am
ORD
- JAC
1 stop5h 46m
United Airlines
Tue 6/167:30 am
JAC
- ORD
Nonstop3h 10m
United Airlines
Deal found 5/2![United Airlines logo]()
$352
This Trip.com deal was found by Cheapflights users on 4/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/272:02 pm
ORD
- JAC
1 stop6h 35m
Delta
Tue 8/48:35 am
JAC
- ORD
1 stop7h 09m
Delta
Deal found 4/27![Delta logo]()
$334
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 7/14:35 pm
MDW
- BOI
2 stops8h 50m
Southwest
Fri 7/318:45 am
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 4/29![Southwest logo]()
$392
This United Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/225:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Tue 6/22:30 pm
IDA
- ORD
1 stop7h 19m
United Airlines
Deal found 5/2![United Airlines logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/316:00 am
ORD
- GEG
1 stop7h 42m
Alaska Airlines
Thu 6/41:59 pm
GEG
- ORD
1 stop8h 00m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$367
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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
- BOI
1 stop5h 40m
Delta
Sat 7/255:30 am
BOI
- MDW
1 stop6h 39m
Delta
Deal found 4/29![Delta logo]()
$335
This Southwest deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/267:10 am
STL
- GEG
1 stop7h 55m
Southwest
Tue 5/262:25 pm
GEG
- STL
1 stop6h 50m
Southwest
Deal found 5/2![Southwest logo]()
$397
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Sun 5/245:30 am
ORD
- BOI
1 stop8h 13m
Delta
Sat 5/302:23 pm
BOI
- ORD
1 stop5h 57m
Delta
Deal found 4/30![Delta logo]()
$335
This United Airlines deal was found by Cheapflights users on 4/28. 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 5/234:28 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Thu 5/2812:33 pm
JAC
- ORD
Nonstop3h 10m
United Airlines
Deal found 4/28![United Airlines logo]()
$383
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/128:00 am
ORD
- BOI
1 stop6h 52m
Alaska Airlines
Wed 5/134:19 pm
BOI
- ORD
1 stop6h 40m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$383
This Southwest deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Sun 5/2410:15 am
MDW
- BOI
2 stops8h 15m
Southwest
Sat 5/301:55 pm
BOI
- MDW
2 stops8h 30m
Southwest
Deal found 4/30![Southwest logo]()
$398
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 7/155:55 pm
ORD
- GEG
1 stop8h 00m
Delta
Tue 7/215:25 am
GEG
- ORD
1 stop6h 03m
Delta
Deal found 4/30![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/166:00 am
ORD
- BOI
1 stop8h 02m
Alaska Airlines
Sun 5/176:35 am
BOI
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$395
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Sun 8/25:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 8/85:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 4/28![United Airlines logo]()
$400
This Southwest deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 7/710:15 am
MDW
- GEG
Nonstop3h 45m
Southwest
Sat 7/113:15 pm
GEG
- MDW
1 stop11h 25m
Southwest
Deal found 4/29![Southwest logo]()
$403
This Delta deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 7/87:06 pm
MDW
- GEG
1 stop6h 00m
Delta
Wed 7/1512:50 pm
GEG
- MDW
1 stop7h 25m
Delta
Deal found 5/1![Delta logo]()
$335
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 6/175:00 am
ORD
- JAC
1 stop5h 46m
United Airlines
Tue 6/234:23 pm
JAC
- ORD
1 stop5h 26m
United Airlines
Deal found 4/27![United Airlines logo]()
$400
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/212:00 pm
ORD
- GEG
2 stops11h 35m
Delta
Tue 5/267:23 pm
GEG
- ORD
2 stops11h 13m
Delta
Deal found 4/30![Delta logo]()
$336
This Southwest deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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.
Sun 5/315:45 am
MDW
- BOI
1 stop6h 35m
Southwest
Sun 6/77:50 pm
BOI
- MDW
1 stop8h 20m
Southwest
Deal found 5/2![Southwest logo]()
$417
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 7/205:42 pm
ORD
- IDA
1 stop22h 55m
Alaska Airlines
Sat 7/254:14 pm
IDA
- ORD
1 stop11h 46m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$429
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 7/234:21 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Tue 7/284:23 pm
JAC
- ORD
1 stop5h 26m
United Airlines
Deal found 5/1![United Airlines logo]()
$408
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Sun 5/249:23 am
MDW
- BOI
2 stops9h 27m
Delta
Sat 5/305:20 am
BOI
- MDW
1 stop6h 59m
Delta
Deal found 4/30![Delta logo]()
$340
This Southwest deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 7/215:50 pm
MDW
- GEG
2 stops7h 55m
Southwest
Tue 8/47:30 am
GEG
- MDW
2 stops9h 30m
Southwest
Deal found 4/30![Southwest logo]()
$418
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated May 2, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated May 2, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:17 am
ORD
- GEG
Nonstop3h 57m
American Airlines
Tue 5/2612:51 pm
GEG
- ORD
1 stop8h 46m
American Airlines
Deal found 4/30![American Airlines logo]()
$316
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/2311:17 am
ORD
- GEG
Nonstop3h 57m
American Airlines
Tue 5/262:08 pm
GEG
- ORD
Nonstop3h 59m
American Airlines
Deal found 4/29![American Airlines logo]()
$306
This Expedia deal was found by Cheapflights users on 4/28. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
ORD
- GEG
1 stop7h 42m
Multiple Airlines
Wed 5/2712:33 pm
GEG
- ORD
1 stop5h 59m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$293
This American Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Sun 5/2411:30 am
ORD
- BOI
Nonstop3h 50m
American Airlines
Sat 5/303:11 pm
BOI
- ORD
Nonstop3h 53m
American Airlines
Deal found 4/30![American Airlines logo]()
$315
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/265:50 pm
ORD
- GEG
1 stop7h 19m
American Airlines
Tue 6/22:11 pm
GEG
- ORD
Nonstop3h 59m
American Airlines
Deal found 4/29![American Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 4/28. 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 5/267:13 pm
MDW
- GEG
1 stop5h 53m
Delta
Tue 6/210:40 pm
GEG
- MDW
1 stop9h 20m
Delta
Deal found 4/28![Delta logo]()
$317
This Expedia deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 5/276:00 am
ORD
- GEG
1 stop9h 04m
Multiple Airlines
Mon 6/112:33 pm
GEG
- ORD
1 stop5h 59m
Multiple Airlines
Deal found 5/2![Multiple Airlines logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/287:49 pm
ORD
- BOI
1 stop16h 14m
Alaska Airlines
Sat 5/308:51 pm
BOI
- ORD
1 stop8h 29m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$295
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 5/287:40 am
ORD
- BOI
1 stop8h 54m
Alaska Airlines
Mon 6/16:12 pm
BOI
- ORD
1 stop18h 02m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$310
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 5/292:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Sat 6/61:59 pm
GEG
- ORD
1 stop7h 00m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$295
This American Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/2911:17 am
ORD
- GEG
Nonstop3h 57m
American Airlines
Sat 6/62:01 pm
GEG
- ORD
Nonstop3h 58m
American Airlines
Deal found 4/30![American Airlines logo]()
$315
This Orbitz deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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.
Fri 5/295:44 pm
ORD
- BOI
1 stop7h 14m
Multiple Airlines
Sun 5/311:25 pm
BOI
- ORD
1 stop6h 07m
Multiple Airlines
Deal found 5/1![Multiple Airlines logo]()
$320
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 2, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated May 2, 2026.
This Trip.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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.
Wed 5/139:37 pm
ORD
- BOI
1 stop15h 50m
Frontier
Deal found 4/29![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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.
Wed 5/279:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 4/29![Frontier logo]()
$112
This CheapOair deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” 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 6/19:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 5/2![Frontier logo]()
$116
This CheapOair deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/209:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 4/30![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 6/18:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Deal found 4/30![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/189:57 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 4/29![Frontier logo]()
$131
This CheapOair deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 6/279:48 pm
ORD
- BOI
1 stop15h 42m
Frontier
Deal found 4/30![Frontier logo]()
$137
This CheapOair deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 4/30![Frontier logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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
- GEG
1 stop8h 29m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$139
This Kiwi.com deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Tue 6/99:48 pm
ORD
- GEG
1 stop15h 48m
Frontier
Deal found 4/30![Frontier logo]()
$140
This Kiwi.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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.
Sat 5/239:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 4/29![Frontier logo]()
$141
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 10/247:00 am
ORD
- IDA
1 stop8h 27m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$146
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 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $244 (Expedia) |
One-way from | $109 (Trip.com) |
Popular in | November |
Cheapest in | February |
Average price | $372 |
Good round-trip deal | $350 or less |
Good one-way deal | $209 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 2, 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
Wed 9/30
5:00 am-9:53 am
1 stop5h 53m
Idaho Falls Fanning Field
Wed 10/7
4:04 pm-11:57 pm
1 stop6h 53m
$291
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Fri 5/29
2:10 pm-9:45 pm
1 stop9h 35m
Spokane
Sat 6/6
1:59 pm-11:59 pm
1 stop8h 00m
$295
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Tue 5/26
7:13 pm-11:06 pm
1 stop5h 53m
Spokane
Tue 6/2
10:40 pm-10:00 am
1 stop9h 20m
$317
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Sat 5/23
7:13 pm-11:06 pm
1 stop5h 53m
Spokane
Tue 5/26
10:40 pm-10:00 am
1 stop9h 20m
$326
ChicagoJackson
ORD - JAC
ORDJAC
Chicago O'Hare Intl
Mon 7/27
2:02 pm-7:37 pm
1 stop6h 35m
Jackson Hole
Tue 8/4
8:35 am-4:44 pm
1 stop7h 09m
$334
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 7/29
6:00 am-12:29 pm
1 stop8h 29m
Spokane
Sat 8/8
8:15 am-7:37 pm
1 stop9h 22m
$335
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Tue 7/21
7:06 pm-11:46 pm
1 stop5h 40m
Boise Air Term. Gowen Fld
Sat 7/25
5:30 am-1:09 pm
1 stop6h 39m
$335
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sun 5/24
5:30 am-12:43 pm
1 stop8h 13m
Boise Air Term. Gowen Fld
Sat 5/30
2:23 pm-9:20 pm
1 stop5h 57m
$335
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 7/15
5:55 pm-11:55 pm
1 stop8h 00m
Spokane
Tue 7/21
5:25 am-1:28 pm
1 stop6h 03m
$335
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Wed 7/8
7:06 pm-11:06 pm
1 stop6h 00m
Spokane
Wed 7/15
12:50 pm-10:15 pm
1 stop7h 25m
$335
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
ORD-BOI
STL-GEG
ORD-JAC
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
ORD-BOI
STL-GEG
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 2, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 27% 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 2, 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 (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 2, 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.
Food
7.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Overall
8.0
Crew
8.6
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
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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 2, 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 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$337 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$249 | Average$516 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$378 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$268 | Average$443 | FlexibilityNo cancel fee | On-time71% |