$92+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
May 11 — May 181
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 April 11, 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 April 11, 2026.
This CheapOair deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/189:48 pm
ORD
- BOI
1 stop15h 21m
Frontier
Tue 7/211:04 pm
BOI
- ORD
1 stop6h 49m
Frontier
Deal found 4/9![Frontier logo]()
$281
This Expedia deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/56:00 am
ORD
- GEG
1 stop6h 38m
Alaska Airlines
Thu 5/71:34 pm
GEG
- ORD
1 stop8h 25m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/169:37 pm
ORD
- BOI
1 stop15h 50m
Multiple Airlines
Tue 5/261:25 pm
BOI
- ORD
2 stops24h 38m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$292
This Expedia deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/92:20 pm
ORD
- GEG
1 stop10h 47m
Multiple Airlines
Mon 7/1312:28 pm
GEG
- ORD
1 stop6h 25m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Multiple Airlines
Tue 5/261:25 pm
BOI
- ORD
2 stops24h 38m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$294
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/58:50 am
ORD
- BOI
1 stop13h 36m
Alaska Airlines
Sat 5/97:43 am
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$295
This American Airlines deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/269:56 am
ORD
- JAC
Nonstop3h 14m
American Airlines
Sat 5/303:49 pm
JAC
- ORD
Nonstop3h 25m
American Airlines
Deal found 4/8![American Airlines logo]()
$295
This Vliegwinkel deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/282:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Wed 6/37:01 am
GEG
- ORD
1 stop9h 49m
Alaska Airlines
Deal found 4/9![Alaska Airlines logo]()
$296
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/56:00 am
ORD
- GEG
1 stop6h 38m
Alaska Airlines
Tue 5/1212:40 pm
GEG
- ORD
1 stop14h 25m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$297
This CheapOair deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:37 pm
ORD
- BOI
1 stop15h 50m
Frontier
Sun 5/101:22 pm
BOI
- ORD
1 stop6h 10m
Frontier
Deal found 4/9![Frontier logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com 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
Tue 6/91:25 pm
BOI
- ORD
2 stops17h 38m
Frontier
Deal found 4/10![Frontier logo]()
$302
This American Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/510:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Thu 5/71:13 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 4/6![American Airlines logo]()
$306
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 April 11, 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 April 11, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/286:00 am
ORD
- GEG
1 stop6h 38m
Alaska Airlines
Sat 5/27:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$306
This Delta deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/301:22 pm
MDW
- JAC
2 stops9h 07m
Delta
Tue 6/27:00 am
JAC
- MDW
1 stop5h 19m
Delta
Deal found 4/10![Delta logo]()
$320
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:00 am
ORD
- BOI
2 stops10h 15m
Southwest
Tue 5/56:00 am
BOI
- ORD
1 stop6h 55m
Southwest
Deal found 4/11![Southwest logo]()
$324
This United Airlines deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/195:00 am
ORD
- IDA
1 stop5h 53m
United Airlines
Tue 9/224:10 pm
IDA
- ORD
1 stop5h 31m
United Airlines
Deal found 4/9![United Airlines logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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.
Thu 6/188:08 pm
STL
- GEG
2 stops16h 59m
Multiple Airlines
Mon 6/2212:28 pm
GEG
- STL
1 stop28h 55m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$467
This United Airlines deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/24:40 pm
ORD
- BOI
Nonstop3h 53m
United Airlines
Tue 5/58:34 am
BOI
- ORD
Nonstop3h 39m
United Airlines
Deal found 4/11![United Airlines logo]()
$330
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/239:00 am
ORD
- GEG
1 stop14h 45m
Alaska Airlines
Sat 5/307:01 am
GEG
- ORD
1 stop14h 54m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$330
This Southwest deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/511:55 am
ORD
- GEG
2 stops11h 40m
Southwest
Thu 5/76:50 am
GEG
- ORD
1 stop9h 45m
Southwest
Deal found 4/6![Southwest logo]()
$331
This Delta deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/287:45 pm
ORD
- GEG
1 stop5h 50m
Delta
Wed 6/36:10 am
GEG
- ORD
2 stops11h 10m
Delta
Deal found 4/9![Delta logo]()
$331
This Delta deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/21:29 pm
ORD
- GEG
2 stops9h 33m
Delta
Tue 5/510:40 pm
GEG
- ORD
1 stop8h 00m
Delta
Deal found 4/9![Delta logo]()
$331
This Alaska Airlines deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:50 am
ORD
- GEG
1 stop15h 30m
Alaska Airlines
Thu 5/147:01 am
GEG
- ORD
1 stop9h 49m
Alaska Airlines
Deal found 4/9![Alaska Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/54:00 pm
MDW
- GEG
2 stops9h 25m
Southwest
Thu 5/75:35 pm
GEG
- MDW
2 stops9h 00m
Southwest
Deal found 4/8![Southwest logo]()
$336
This United Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/301:05 pm
ORD
- JAC
1 stop5h 49m
United Airlines
Tue 6/24:23 pm
JAC
- ORD
1 stop5h 26m
United Airlines
Deal found 4/10![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/167:13 pm
MDW
- BOI
1 stop5h 33m
Delta
Tue 5/2611:39 pm
BOI
- MDW
1 stop9h 21m
Delta
Deal found 4/6![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/299:00 am
ORD
- GEG
1 stop14h 45m
Alaska Airlines
Sat 6/612:46 pm
GEG
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 4/11![Alaska Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/235:30 pm
MDW
- GEG
1 stop5h 45m
Southwest
Sat 5/302:25 pm
GEG
- MDW
1 stop12h 35m
Southwest
Deal found 4/6![Southwest logo]()
$340
This United Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/304:28 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Wed 6/37:30 am
JAC
- ORD
Nonstop3h 10m
United Airlines
Deal found 4/7![United Airlines logo]()
$354
This Alaska Airlines deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
ORD
- GEG
1 stop7h 04m
Alaska Airlines
Sat 8/2911:58 am
GEG
- ORD
1 stop10h 01m
Alaska Airlines
Deal found 4/11![Alaska Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/299:23 am
MDW
- GEG
1 stop5h 48m
Delta
Sat 6/65:35 am
GEG
- MDW
2 stops10h 21m
Delta
Deal found 4/10![Delta logo]()
$340
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 6/235:35 am
MDW
- BOI
2 stops10h 05m
Southwest
Mon 6/298:45 am
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 4/7![Southwest logo]()
$350
This United Airlines deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/231:05 pm
ORD
- BOI
1 stop5h 51m
United Airlines
Sun 5/315:46 pm
BOI
- ORD
1 stop5h 58m
United Airlines
Deal found 4/10![United Airlines logo]()
$355
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 8/137:20 am
ORD
- GEG
1 stop6h 25m
Alaska Airlines
Sat 8/223:05 pm
GEG
- ORD
1 stop6h 36m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:12 am
ORD
- GEG
1 stop7h 01m
Delta
Sat 6/65:35 am
GEG
- ORD
2 stops9h 16m
Delta
Deal found 4/9![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Mon 6/82:30 pm
IDA
- ORD
1 stop7h 49m
United Airlines
Deal found 4/6![United Airlines logo]()
$358
This Southwest deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/52:40 pm
MDW
- BOI
Nonstop3h 35m
Southwest
Wed 6/104:20 pm
BOI
- MDW
1 stop6h 45m
Southwest
Deal found 4/10![Southwest logo]()
$360
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/137:41 pm
STL
- GEG
1 stop6h 18m
Alaska Airlines
Sat 5/168:20 am
GEG
- STL
1 stop6h 17m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/307:12 am
ORD
- BOI
1 stop8h 31m
Delta
Sat 6/66:00 am
BOI
- ORD
1 stop4h 52m
Delta
Deal found 4/8![Delta logo]()
$355
This Southwest deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/284:05 pm
MDW
- BOI
2 stops8h 25m
Southwest
Sun 5/313:25 pm
BOI
- MDW
1 stop8h 25m
Southwest
Deal found 4/7![Southwest logo]()
$360
This Delta deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 7/85:55 pm
ORD
- BOI
1 stop6h 58m
Delta
Wed 7/156:42 pm
BOI
- ORD
2 stops12h 17m
Delta
Deal found 4/6![Delta logo]()
$360
This Southwest deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/155:15 pm
MDW
- GEG
2 stops9h 15m
Southwest
Mon 5/185:35 pm
GEG
- MDW
2 stops9h 00m
Southwest
Deal found 4/8![Southwest logo]()
$365
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated April 11, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated April 11, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 4/297:04 am
ORD
- GEG
1 stop9h 15m
American Airlines
Wed 5/61:22 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 4/7![American Airlines logo]()
$307
This Expedia deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/26:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Tue 5/512:15 pm
BOI
- ORD
1 stop10h 44m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$310
This Expedia deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/56:00 am
ORD
- GEG
1 stop6h 38m
Alaska Airlines
Thu 5/71:34 pm
GEG
- ORD
1 stop8h 25m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$286
This Alaska Airlines deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/58:50 am
ORD
- BOI
1 stop13h 36m
Alaska Airlines
Sat 5/97:43 am
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$295
This Alaska Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/56:00 am
ORD
- GEG
1 stop6h 38m
Alaska Airlines
Tue 5/1212:40 pm
GEG
- ORD
1 stop14h 25m
Alaska Airlines
Deal found 4/6![Alaska Airlines logo]()
$297
This American Airlines deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/510:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Thu 5/71:13 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 4/6![American Airlines logo]()
$306
This CheapOair deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:37 pm
ORD
- BOI
1 stop15h 50m
Frontier
Sun 5/101:22 pm
BOI
- ORD
1 stop6h 10m
Frontier
Deal found 4/9![Frontier logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/169:37 pm
ORD
- BOI
1 stop15h 50m
Multiple Airlines
Tue 5/261:25 pm
BOI
- ORD
2 stops24h 38m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$292
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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
Multiple Airlines
Tue 5/261:25 pm
BOI
- ORD
2 stops24h 38m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$294
This American Airlines deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/241:16 pm
ORD
- JAC
Nonstop3h 14m
American Airlines
Tue 6/211:47 am
JAC
- ORD
Nonstop3h 23m
American Airlines
Deal found 4/9![American Airlines logo]()
$310
This American Airlines deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/269:56 am
ORD
- JAC
Nonstop3h 14m
American Airlines
Sat 5/303:49 pm
JAC
- ORD
Nonstop3h 25m
American Airlines
Deal found 4/8![American Airlines logo]()
$295
This Vliegwinkel deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/282:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Wed 6/37:01 am
GEG
- ORD
1 stop9h 49m
Alaska Airlines
Deal found 4/9![Alaska Airlines logo]()
$296
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 April 11, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated April 11, 2026.
This CheapOair deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/99:37 pm
ORD
- BOI
1 stop15h 50m
Frontier
Deal found 4/10![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” 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 5/59:37 pm
ORD
- GEG
2 stops48h 52m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/69:37 pm
ORD
- BOI
1 stop15h 50m
Frontier
Deal found 4/7![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 4/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/89:37 pm
ORD
- BOI
1 stop15h 32m
Frontier
Deal found 4/8![Frontier logo]()
$115
This Kiwi.com deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/129:37 pm
ORD
- GEG
2 stops48h 52m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 5/209:37 pm
ORD
- BOI
1 stop15h 53m
Frontier
Deal found 4/6![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/69:37 pm
ORD
- GEG
2 stops24h 52m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 5/68:56 pm
ORD
- IDA
2 stops43h 31m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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.
Sun 5/109:37 pm
ORD
- IDA
2 stops18h 50m
Multiple Airlines
Deal found 4/7![Multiple Airlines logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/79:30 am
ORD
- IDA
2 stops30h 57m
Multiple Airlines
Deal found 4/9![Multiple Airlines logo]()
$136
This CheapOair deal was found by Cheapflights users on 4/6. Clicking the “Pick Dates” 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 6/209:48 pm
ORD
- BOI
1 stop15h 21m
Frontier
Deal found 4/6![Frontier logo]()
$137
This CheapOair deal was found by Cheapflights users on 4/7. Clicking the “Pick Dates” 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 6/228:08 pm
STL
- BOI
1 stop17h 01m
Frontier
Deal found 4/7![Frontier logo]()
$137
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 April 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $286 (Expedia) |
One-way from | $92 (CheapOair) |
Popular in | November |
Cheapest in | February |
Average price | $370 |
Good round-trip deal | $335 or less |
Good one-way deal | $201 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 April 11, 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
Tue 4/28
6:00 am-10:38 am
1 stop6h 38m
Spokane
Sat 5/2
7:41 pm-6:40 am
1 stop8h 59m
$306
ChicagoJackson
MDW - JAC
MDWJAC
Chicago Midway
Sat 5/30
1:22 pm-9:29 pm
2 stops9h 07m
Jackson Hole
Tue 6/2
7:00 am-1:19 pm
1 stop5h 19m
$320
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 5/2
7:00 am-4:15 pm
2 stops10h 15m
Boise Air Term. Gowen Fld
Tue 5/5
6:00 am-1:55 pm
1 stop6h 55m
$324
ChicagoIdaho Falls
ORD - IDA
ORDIDA
Chicago O'Hare Intl
Sat 9/19
5:00 am-9:53 am
1 stop5h 53m
Idaho Falls Fanning Field
Tue 9/22
4:10 pm-10:41 pm
1 stop5h 31m
$329
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Sat 5/2
4:40 pm-7:33 pm
Nonstop3h 53m
Boise Air Term. Gowen Fld
Tue 5/5
8:34 am-1:13 pm
Nonstop3h 39m
$330
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 5/23
9:00 am-9:45 pm
1 stop14h 45m
Spokane
Sat 5/30
7:01 am-11:55 pm
1 stop14h 54m
$330
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Tue 5/5
11:55 am-9:35 pm
2 stops11h 40m
Spokane
Thu 5/7
6:50 am-6:35 pm
1 stop9h 45m
$331
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Thu 5/28
7:45 pm-11:35 pm
1 stop5h 50m
Spokane
Wed 6/3
6:10 am-7:20 pm
2 stops11h 10m
$331
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 5/2
1:29 pm-9:02 pm
2 stops9h 33m
Spokane
Tue 5/5
10:40 pm-8:40 am
1 stop8h 00m
$331
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Mon 5/11
8:50 am-10:20 pm
1 stop15h 30m
Spokane
Thu 5/14
7:01 am-6:50 pm
1 stop9h 49m
$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.
ORD-BOI
ORD-GEG
ORD-JAC
STL-BOI
MDW-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
ORD-BOI
ORD-GEG
ORD-JAC
STL-BOI
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 $129). Flying from Illinois to Idaho in March is currently the most expensive (average of $398). 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 April 11, 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 April 11, 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 (5 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 April 11, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, andDelta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Entertainment
7.5
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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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 April 11, 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 April 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$337 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$463 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$378 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$268 | Average$464 | FlexibilityNo cancel fee | On-time71% |