$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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Apr 23 — Apr 301
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 March 24, 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 March 24, 2026.
This CheapOair deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Sun 4/1212:03 pm
BOI
- STL
1 stop20h 45m
Frontier
Deal found 3/24![Frontier logo]()
$211
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/277:45 am
ORD
- GEG
1 stop8h 00m
Southwest
Wed 6/35:10 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/22![Southwest logo]()
$221
This Southwest deal was found by Cheapflights users on 3/24. 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.
Wed 5/66:30 am
MDW
- GEG
1 stop5h 45m
Southwest
Tue 5/122:40 pm
GEG
- MDW
1 stop12h 45m
Southwest
Deal found 3/24![Southwest logo]()
$227
This CheapOair deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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 4/18:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Sun 4/512:03 pm
BOI
- STL
1 stop20h 45m
Frontier
Deal found 3/20![Frontier logo]()
$237
This CheapOair deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:29 pm
ORD
- BOI
1 stop20h 39m
Frontier
Sun 4/1212:03 pm
BOI
- ORD
1 stop24h 16m
Frontier
Deal found 3/23![Frontier logo]()
$242
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 5/54:50 pm
ORD
- BOI
1 stop8h 35m
Southwest
Sat 5/97:05 am
BOI
- ORD
1 stop6h 25m
Southwest
Deal found 3/24![Southwest logo]()
$243
This Southwest deal was found by Cheapflights users on 3/23. 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.
Sat 5/27:00 am
ORD
- BOI
2 stops10h 15m
Southwest
Tue 5/56:00 am
BOI
- ORD
1 stop6h 55m
Southwest
Deal found 3/23![Southwest logo]()
$248
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/217:30 am
MDW
- BOI
1 stop6h 50m
Southwest
Tue 4/285:00 pm
BOI
- MDW
2 stops10h 35m
Southwest
Deal found 3/24![Southwest logo]()
$251
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/2110:30 am
ORD
- BOI
1 stop5h 55m
Southwest
Tue 4/281:05 pm
BOI
- ORD
2 stops8h 50m
Southwest
Deal found 3/24![Southwest logo]()
$251
This American Airlines deal was found by Cheapflights users on 3/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2810:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Tue 5/51:22 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 3/23![American Airlines logo]()
$251
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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.
Sat 5/26:00 am
ORD
- BOI
1 stop8h 52m
Alaska Airlines
Tue 5/52:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$263
This SmartFares deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SmartFares 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
Sat 5/92:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/22![Alaska Airlines logo]()
$265
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 March 24, 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 March 24, 2026.
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/217:30 am
MDW
- BOI
1 stop6h 50m
Southwest
Tue 4/285:00 pm
BOI
- MDW
2 stops10h 35m
Southwest
Deal found 3/24![Southwest logo]()
$251
This Delta deal was found by Cheapflights users on 3/24. 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.
Wed 4/2212:52 pm
MDW
- GEG
1 stop10h 39m
Delta
Tue 4/286:00 am
GEG
- MDW
1 stop5h 32m
Delta
Deal found 3/24![Delta logo]()
$271
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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.
Tue 4/283:52 pm
ORD
- GEG
1 stop8h 28m
Alaska Airlines
Sat 5/27:41 pm
GEG
- ORD
1 stop8h 59m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$283
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/64:28 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Thu 6/114:23 pm
JAC
- ORD
1 stop7h 21m
United Airlines
Deal found 3/22![United Airlines logo]()
$359
This American Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 6/308:36 am
STL
- BOI
1 stop7h 31m
American Airlines
Tue 7/73:06 pm
BOI
- STL
1 stop7h 50m
American Airlines
Deal found 3/19![American Airlines logo]()
$407
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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.
Fri 4/175:15 am
ORD
- IDA
2 stops11h 12m
Multiple Airlines
Fri 4/2410:21 pm
IDA
- ORD
1 stop30h 04m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$471
This Delta deal was found by Cheapflights users on 3/24. 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.
Wed 6/33:47 pm
ORD
- GEG
2 stops9h 48m
Delta
Wed 6/106:20 am
GEG
- ORD
1 stop9h 00m
Delta
Deal found 3/24![Delta logo]()
$276
This Southwest deal was found by Cheapflights users on 3/23. 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.
Sat 5/26:00 am
MDW
- BOI
1 stop5h 25m
Southwest
Sat 5/92:50 pm
BOI
- MDW
1 stop5h 30m
Southwest
Deal found 3/23![Southwest logo]()
$299
This Alaska Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 5/126:00 am
ORD
- GEG
1 stop6h 38m
Alaska Airlines
Tue 5/127:41 pm
GEG
- ORD
1 stop8h 39m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 3/24. 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.
Mon 4/207:00 am
STL
- GEG
1 stop7h 13m
Delta
Wed 4/225:10 pm
GEG
- STL
1 stop5h 15m
Delta
Deal found 3/24![Delta logo]()
$312
This Southwest deal was found by Cheapflights users on 3/23. 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.
Thu 5/284:50 pm
ORD
- GEG
1 stop9h 45m
Southwest
Sat 5/305:45 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/23![Southwest logo]()
$314
This Alaska Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 4/303:52 pm
ORD
- BOI
1 stop8h 10m
Alaska Airlines
Mon 5/42:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$325
This Southwest deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 5/56:30 pm
STL
- GEG
1 stop6h 55m
Southwest
Tue 5/125:10 am
GEG
- STL
1 stop6h 20m
Southwest
Deal found 3/21![Southwest logo]()
$317
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Fri 5/87:55 pm
ORD
- BOI
Nonstop3h 55m
United Airlines
Sat 5/162:33 pm
BOI
- ORD
1 stop7h 25m
United Airlines
Deal found 3/23![United Airlines logo]()
$385
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 5/128:42 am
ORD
- GEG
1 stop6h 29m
Delta
Tue 5/127:23 pm
GEG
- ORD
2 stops11h 22m
Delta
Deal found 3/19![Delta logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 5/88:48 pm
ORD
- BOI
1 stop13h 54m
Alaska Airlines
Sun 5/106:00 am
BOI
- ORD
1 stop9h 56m
Alaska Airlines
Deal found 3/19![Alaska Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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 5/24:45 pm
STL
- GEG
1 stop6h 50m
Southwest
Tue 5/125:10 am
GEG
- STL
1 stop6h 20m
Southwest
Deal found 3/20![Southwest logo]()
$317
This United Airlines deal was found by Cheapflights users on 3/23. 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 4/289:10 am
STL
- BOI
2 stops13h 12m
United Airlines
Sat 5/212:30 pm
BOI
- STL
2 stops9h 49m
United Airlines
Deal found 3/23![United Airlines logo]()
$390
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 5/25:40 am
MDW
- GEG
1 stop8h 01m
Delta
Mon 5/410:40 pm
GEG
- MDW
1 stop9h 16m
Delta
Deal found 3/19![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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 5/292:10 pm
ORD
- GEG
1 stop9h 35m
Alaska Airlines
Sat 6/612:46 pm
GEG
- ORD
1 stop9h 13m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$350
This United Airlines deal was found by Cheapflights users on 3/23. 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 5/94:15 pm
STL
- GEG
1 stop7h 01m
United Airlines
Wed 5/135:00 am
GEG
- STL
1 stop6h 13m
United Airlines
Deal found 3/23![United Airlines logo]()
$395
This Southwest deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 4/183:15 pm
MDW
- GEG
2 stops9h 00m
Southwest
Tue 4/215:10 am
GEG
- MDW
1 stop7h 00m
Southwest
Deal found 3/19![Southwest logo]()
$331
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 4/299:29 am
MDW
- BOI
1 stop5h 57m
Delta
Sat 5/26:00 am
BOI
- MDW
2 stops11h 36m
Delta
Deal found 3/19![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 3/24. 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 5/157:55 pm
ORD
- BOI
Nonstop3h 55m
United Airlines
Tue 5/265:46 pm
BOI
- ORD
1 stop5h 58m
United Airlines
Deal found 3/24![United Airlines logo]()
$403
This Southwest deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 4/185:30 pm
MDW
- GEG
1 stop5h 45m
Southwest
Sat 4/2510:45 am
GEG
- MDW
1 stop8h 35m
Southwest
Deal found 3/19![Southwest logo]()
$335
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/196:00 pm
ORD
- GEG
1 stop6h 48m
Delta
Wed 8/265:20 am
GEG
- ORD
2 stops10h 41m
Delta
Deal found 3/19![Delta logo]()
$340
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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.
Wed 4/17:24 pm
ORD
- BOI
1 stop15h 57m
Alaska Airlines
Tue 4/78:28 pm
BOI
- ORD
1 stop9h 11m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$383
This United Airlines deal was found by Cheapflights users on 3/23. 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.
Mon 6/81:13 pm
STL
- JAC
1 stop6h 29m
United Airlines
Sat 6/134:23 pm
JAC
- STL
1 stop6h 34m
United Airlines
Deal found 3/23![United Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/74:35 pm
MDW
- GEG
2 stops9h 55m
Southwest
Sun 5/102:55 pm
GEG
- MDW
1 stop9h 00m
Southwest
Deal found 3/22![Southwest logo]()
$340
This Delta deal was found by Cheapflights users on 3/23. 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.
Sun 5/241:59 pm
MDW
- JAC
1 stop7h 16m
Delta
Thu 5/287:45 am
JAC
- MDW
2 stops9h 48m
Delta
Deal found 3/23![Delta logo]()
$344
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated March 24, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated March 24, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” 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 4/18:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Sun 4/512:03 pm
BOI
- STL
1 stop20h 45m
Frontier
Deal found 3/20![Frontier logo]()
$237
This CheapOair deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Sun 4/1212:03 pm
BOI
- STL
1 stop20h 45m
Frontier
Deal found 3/24![Frontier logo]()
$211
This CheapOair deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:29 pm
ORD
- BOI
1 stop20h 39m
Frontier
Sun 4/1212:03 pm
BOI
- ORD
1 stop24h 16m
Frontier
Deal found 3/23![Frontier logo]()
$242
This Kiwi.com deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” 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 4/184:10 pm
ORD
- GEG
1 stop9h 49m
Hawaiian Airlines
Tue 4/217:19 am
GEG
- ORD
1 stop9h 21m
Hawaiian Airlines
Deal found 3/19![Hawaiian Airlines logo]()
$266
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/216:30 am
MDW
- BOI
1 stop5h 25m
Southwest
Tue 4/285:00 pm
BOI
- MDW
2 stops10h 35m
Southwest
Deal found 3/24![Southwest logo]()
$251
This Southwest deal was found by Cheapflights users on 3/24. 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.
Tue 4/2110:30 am
ORD
- BOI
1 stop5h 55m
Southwest
Tue 4/281:05 pm
BOI
- ORD
2 stops8h 50m
Southwest
Deal found 3/24![Southwest logo]()
$251
This Delta deal was found by Cheapflights users on 3/23. 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 4/229:29 am
MDW
- BOI
1 stop5h 57m
Delta
Tue 4/2811:35 pm
BOI
- MDW
1 stop9h 21m
Delta
Deal found 3/23![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 3/23. 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 4/2212:46 pm
ORD
- BOI
1 stop8h 14m
Delta
Tue 4/285:40 am
BOI
- ORD
1 stop6h 43m
Delta
Deal found 3/23![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 3/24. 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.
Wed 4/2212:46 pm
ORD
- GEG
1 stop8h 11m
Delta
Tue 4/285:00 am
GEG
- ORD
1 stop6h 23m
Delta
Deal found 3/24![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 3/24. 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.
Wed 4/2212:52 pm
MDW
- GEG
1 stop10h 39m
Delta
Tue 4/286:00 am
GEG
- MDW
1 stop5h 32m
Delta
Deal found 3/24![Delta logo]()
$271
This American Airlines deal was found by Cheapflights users on 3/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2810:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Tue 5/51:22 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 3/23![American Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 3/23. 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 4/286:05 pm
MDW
- GEG
1 stop7h 20m
Southwest
Fri 5/12:50 pm
GEG
- MDW
1 stop6h 50m
Southwest
Deal found 3/23![Southwest logo]()
$282
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 March 24, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated March 24, 2026.
This CheapOair deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 5/209:42 pm
ORD
- BOI
1 stop15h 48m
Frontier
Deal found 3/21![Frontier logo]()
$92
This Southwest deal was found by Cheapflights users on 3/23. 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 4/226:30 am
MDW
- BOI
1 stop5h 25m
Southwest
Deal found 3/23![Southwest logo]()
$111
This Southwest deal was found by Cheapflights users on 3/23. 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 4/224:50 pm
ORD
- BOI
1 stop8h 35m
Southwest
Deal found 3/23![Southwest logo]()
$111
This Southwest deal was found by Cheapflights users on 3/23. 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 4/226:15 am
ORD
- GEG
1 stop8h 50m
Southwest
Deal found 3/23![Southwest logo]()
$111
This Southwest deal was found by Cheapflights users on 3/23. 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 4/226:30 am
MDW
- GEG
1 stop5h 45m
Southwest
Deal found 3/23![Southwest logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 3/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:42 pm
ORD
- GEG
1 stop15h 56m
Frontier
Deal found 3/24![Frontier logo]()
$125
This American Airlines deal was found by Cheapflights users on 3/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:54 am
ORD
- BOI
Nonstop3h 55m
American Airlines
Deal found 3/23![American Airlines logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 3/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/259:42 pm
ORD
- BOI
1 stop15h 48m
Frontier
Deal found 3/24![Frontier logo]()
$127
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/234:15 pm
ORD
- GEG
1 stop7h 20m
Southwest
Deal found 3/24![Southwest logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 4/228:58 pm
ORD
- GEG
1 stop25h 31m
Multiple Airlines
Deal found 3/21![Multiple Airlines logo]()
$133
This Priceline deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/57:55 am
ORD
- GEG
1 stop8h 29m
Frontier
Deal found 3/21![Frontier logo]()
$135
This Delta deal was found by Cheapflights users on 3/24. 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.
Tue 4/219:29 am
MDW
- BOI
1 stop5h 57m
Delta
Deal found 3/24![Delta logo]()
$136
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 March 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $211 (CheapOair) |
One-way from | $92 (CheapOair) |
Popular in | June |
Cheapest in | February |
Average price | $397 |
Good round-trip deal | $281 or less |
Good one-way deal | $259 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 March 24, 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
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Tue 4/21
7:30 am-1:20 pm
1 stop6h 50m
Boise Air Term. Gowen Fld
Tue 4/28
5:00 pm-4:35 am
2 stops10h 35m
$251
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Wed 4/22
12:52 pm-9:31 pm
1 stop10h 39m
Spokane
Tue 4/28
6:00 am-1:32 pm
1 stop5h 32m
$271
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 6/3
3:47 pm-11:35 pm
2 stops9h 48m
Spokane
Wed 6/10
6:20 am-5:20 pm
1 stop9h 00m
$276
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Tue 4/28
3:52 pm-10:20 pm
1 stop8h 28m
Spokane
Sat 5/2
7:41 pm-6:40 am
1 stop8h 59m
$283
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Sat 5/2
6:00 am-10:25 am
1 stop5h 25m
Boise Air Term. Gowen Fld
Sat 5/9
2:50 pm-9:20 pm
1 stop5h 30m
$299
St. LouisSpokane
STL - GEG
STLGEG
Lambert-St Louis
Mon 4/20
7:00 am-12:13 pm
1 stop7h 13m
Spokane
Wed 4/22
5:10 pm-12:25 am
1 stop5h 15m
$312
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Thu 5/28
4:50 pm-12:35 am
1 stop9h 45m
Spokane
Sat 5/30
5:45 am-2:30 pm
1 stop6h 45m
$314
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Tue 5/12
6:00 am-10:38 am
1 stop6h 38m
Spokane
Tue 5/12
7:41 pm-6:20 am
1 stop8h 39m
$317
St. LouisSpokane
STL - GEG
STLGEG
Lambert-St Louis
Tue 5/5
6:30 pm-11:25 pm
1 stop6h 55m
Spokane
Tue 5/12
5:10 am-1:30 pm
1 stop6h 20m
$317
St. LouisSpokane
STL - GEG
STLGEG
Lambert-St Louis
Sat 5/2
4:45 pm-9:35 pm
1 stop6h 50m
Spokane
Tue 5/12
5:10 am-1:30 pm
1 stop6h 20m
$317
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.
MDW-BOI
MDW-GEG
ORD-GEG
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
MDW-BOI
MDW-GEG
ORD-GEG
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 $158). Flying from Illinois to Idaho in March is currently the most expensive (average of $383). 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 March 24, 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.
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 March 24, 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
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Entertainment
7.5
Crew
8.6
Boarding
8.1
Overall
8.0
Comfort
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 March 24, 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 March 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$336 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$454 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$378 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$255 | Average$454 | FlexibilityNo cancel fee | On-time71% |