$100+ 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
Apr 29 — May 61
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 30, 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 30, 2026.
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/99:42 pm
ORD
- BOI
1 stop15h 45m
Frontier
Tue 5/121:22 pm
BOI
- ORD
1 stop6h 15m
Frontier
Deal found 3/25![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/69:42 pm
ORD
- BOI
1 stop15h 45m
Frontier
Tue 5/121:22 pm
BOI
- ORD
2 stops32h 39m
Frontier
Deal found 3/25![Frontier logo]()
$211
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/19:42 pm
ORD
- BOI
1 stop15h 48m
Frontier
Tue 6/91:04 pm
BOI
- ORD
1 stop6h 49m
Frontier
Deal found 3/27![Frontier logo]()
$227
This Southwest deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:00 pm
MDW
- GEG
2 stops9h 25m
Southwest
Wed 6/32:25 pm
GEG
- MDW
1 stop6h 55m
Southwest
Deal found 3/27![Southwest logo]()
$227
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/19:42 pm
ORD
- BOI
1 stop15h 48m
Frontier
Thu 6/111:04 pm
BOI
- ORD
1 stop6h 49m
Frontier
Deal found 3/27![Frontier logo]()
$236
This CheapOair deal was found by Cheapflights users on 3/29. 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.
Wed 6/248:08 pm
STL
- BOI
1 stop17h 01m
Frontier
Tue 6/301:04 pm
BOI
- STL
1 stop5h 19m
Frontier
Deal found 3/29![Frontier logo]()
$241
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:45 am
ORD
- GEG
1 stop8h 00m
Southwest
Wed 4/295:10 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/25![Southwest logo]()
$242
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:00 am
ORD
- BOI
1 stop8h 10m
Southwest
Tue 5/56:00 am
BOI
- ORD
1 stop6h 55m
Southwest
Deal found 3/26![Southwest logo]()
$243
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:45 am
ORD
- GEG
1 stop8h 00m
Southwest
Sat 5/25:45 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/25![Southwest logo]()
$243
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/254:15 pm
ORD
- BOI
1 stop6h 50m
Southwest
Tue 4/281:05 pm
BOI
- ORD
2 stops8h 50m
Southwest
Deal found 3/26![Southwest logo]()
$248
This American Airlines deal was found by Cheapflights users on 3/27. 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.
Wed 5/2711:17 am
ORD
- GEG
Nonstop3h 57m
American Airlines
Wed 6/32:08 pm
GEG
- ORD
Nonstop3h 59m
American Airlines
Deal found 3/27![American Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:40 am
MDW
- BOI
1 stop10h 00m
Southwest
Wed 5/62:00 pm
BOI
- MDW
1 stop7h 00m
Southwest
Deal found 3/26![Southwest logo]()
$258
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 30, 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 30, 2026.
This Delta deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:20 pm
ORD
- GEG
1 stop7h 39m
Delta
Wed 6/31:11 pm
GEG
- ORD
1 stop8h 44m
Delta
Deal found 3/27![Delta logo]()
$271
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:00 pm
MDW
- BOI
2 stops8h 45m
Southwest
Tue 5/56:00 am
BOI
- MDW
1 stop7h 10m
Southwest
Deal found 3/26![Southwest logo]()
$287
This Alaska Airlines deal was found by Cheapflights users on 3/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:00 am
STL
- BOI
1 stop9h 33m
Alaska Airlines
Tue 5/52:57 pm
BOI
- STL
1 stop8h 02m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$317
This American Airlines deal was found by Cheapflights users on 3/28. 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.
Sat 4/255:20 am
STL
- BOI
1 stop8h 43m
American Airlines
Sat 5/21:29 pm
BOI
- STL
1 stop7h 48m
American Airlines
Deal found 3/28![American Airlines logo]()
$321
This United Airlines deal was found by Cheapflights users on 3/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/57:55 pm
ORD
- BOI
Nonstop3h 55m
United Airlines
Tue 5/125:27 pm
BOI
- ORD
1 stop5h 30m
United Airlines
Deal found 3/29![United Airlines logo]()
$325
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:46 pm
ORD
- BOI
1 stop9h 38m
Delta
Tue 4/2810:41 am
BOI
- ORD
2 stops9h 37m
Delta
Deal found 3/25![Delta logo]()
$276
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:15 pm
ORD
- BOI
2 stops9h 30m
Southwest
Tue 5/52:00 pm
BOI
- ORD
1 stop7h 55m
Southwest
Deal found 3/26![Southwest logo]()
$287
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/202:27 pm
STL
- BOI
1 stop8h 17m
Delta
Thu 5/282:23 pm
BOI
- STL
1 stop7h 58m
Delta
Deal found 3/26![Delta logo]()
$290
This Southwest deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/285:40 pm
STL
- BOI
2 stops7h 45m
Southwest
Wed 5/134:05 pm
BOI
- STL
1 stop6h 10m
Southwest
Deal found 3/27![Southwest logo]()
$295
This United Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/135:00 am
ORD
- IDA
1 stop5h 50m
United Airlines
Sat 6/205:54 pm
IDA
- ORD
1 stop5h 50m
United Airlines
Deal found 3/26![United Airlines logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:52 pm
ORD
- BOI
1 stop8h 10m
Alaska Airlines
Sat 4/252:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$335
This United Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/244:21 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Thu 5/284:23 pm
JAC
- ORD
1 stop5h 26m
United Airlines
Deal found 3/26![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/231:55 pm
MDW
- GEG
2 stops9h 40m
Southwest
Wed 6/32:25 pm
GEG
- MDW
1 stop6h 55m
Southwest
Deal found 3/25![Southwest logo]()
$303
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/212:14 pm
ORD
- GEG
2 stops8h 43m
Delta
Tue 5/510:40 pm
GEG
- ORD
2 stops12h 05m
Delta
Deal found 3/25![Delta logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 3/29. 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 5/23:52 pm
ORD
- GEG
1 stop8h 28m
Alaska Airlines
Tue 5/52:45 pm
GEG
- ORD
1 stop7h 14m
Alaska Airlines
Deal found 3/29![Alaska Airlines logo]()
$345
This United Airlines deal was found by Cheapflights users on 3/28. 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.
Tue 5/264:21 pm
ORD
- JAC
Nonstop3h 21m
United Airlines
Wed 5/271:42 pm
JAC
- ORD
1 stop6h 57m
United Airlines
Deal found 3/28![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/237:00 am
ORD
- GEG
2 stops11h 05m
Southwest
Sat 5/305:45 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/26![Southwest logo]()
$305
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/231:22 pm
MDW
- GEG
2 stops11h 07m
Delta
Wed 6/35:00 am
GEG
- MDW
2 stops10h 56m
Delta
Deal found 3/25![Delta logo]()
$313
This American Airlines deal was found by Cheapflights users on 3/28. 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.
Sat 8/229:55 am
ORD
- IDA
Nonstop3h 15m
American Airlines
Sat 8/2912:46 pm
IDA
- ORD
Nonstop3h 25m
American Airlines
Deal found 3/28![American Airlines logo]()
$440
This Southwest deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:00 pm
MDW
- GEG
2 stops9h 25m
Southwest
Wed 6/36:30 am
GEG
- MDW
2 stops8h 05m
Southwest
Deal found 3/27![Southwest logo]()
$309
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:15 am
ORD
- GEG
1 stop9h 34m
Delta
Tue 4/287:15 am
GEG
- ORD
1 stop7h 24m
Delta
Deal found 3/25![Delta logo]()
$323
This United Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/107:45 am
STL
- JAC
2 stops8h 39m
United Airlines
Tue 4/142:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 3/26![United Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:35 pm
MDW
- GEG
1 stop7h 20m
Southwest
Thu 6/42:15 pm
GEG
- MDW
1 stop7h 55m
Southwest
Deal found 3/26![Southwest logo]()
$320
This Delta deal was found by Cheapflights users on 3/28. 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.
Thu 7/97:45 am
ORD
- IDA
1 stop7h 56m
Delta
Mon 7/1311:28 am
IDA
- ORD
1 stop6h 29m
Delta
Deal found 3/28![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:45 am
STL
- JAC
2 stops8h 39m
United Airlines
Fri 5/12:30 pm
JAC
- STL
1 stop5h 13m
United Airlines
Deal found 3/25![United Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/231:35 pm
ORD
- BOI
1 stop6h 40m
Southwest
Tue 4/281:05 pm
BOI
- ORD
2 stops8h 50m
Southwest
Deal found 3/25![Southwest logo]()
$331
This Alaska Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/94:46 pm
STL
- GEG
1 stop6h 45m
Alaska Airlines
Wed 5/131:59 pm
GEG
- STL
1 stop7h 55m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$488
This Delta deal was found by Cheapflights users on 3/28. 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.
Mon 6/85:57 pm
ORD
- GEG
1 stop7h 19m
Delta
Wed 6/105:20 am
GEG
- ORD
1 stop6h 10m
Delta
Deal found 3/28![Delta logo]()
$335
This United Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/289:10 am
STL
- BOI
2 stops14h 25m
United Airlines
Sat 5/212:30 pm
BOI
- STL
2 stops9h 49m
United Airlines
Deal found 3/26![United Airlines logo]()
$390
This Southwest deal was found by Cheapflights users on 3/29. 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 5/56:15 am
ORD
- BOI
1 stop7h 15m
Southwest
Tue 5/121:05 pm
BOI
- ORD
2 stops8h 50m
Southwest
Deal found 3/29![Southwest logo]()
$340
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated March 30, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated March 30, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:45 am
ORD
- GEG
1 stop8h 00m
Southwest
Wed 4/295:10 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/25![Southwest logo]()
$242
This American Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2210:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Wed 4/291:22 pm
GEG
- ORD
Nonstop3h 57m
American Airlines
Deal found 3/25![American Airlines logo]()
$251
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:00 am
MDW
- BOI
1 stop8h 07m
Delta
Tue 4/282:18 pm
BOI
- MDW
1 stop7h 10m
Delta
Deal found 3/26![Delta logo]()
$271
This Alaska Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/228:50 am
ORD
- BOI
1 stop13h 36m
Alaska Airlines
Tue 4/287:43 am
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:35 am
ORD
- BOI
2 stops9h 39m
Delta
Tue 4/282:18 pm
BOI
- ORD
1 stop7h 03m
Delta
Deal found 3/26![Delta logo]()
$276
This American Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/229:54 am
ORD
- BOI
Nonstop3h 55m
American Airlines
Tue 4/281:29 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Deal found 3/25![American Airlines logo]()
$283
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/254:15 pm
ORD
- BOI
1 stop6h 50m
Southwest
Tue 4/286:40 am
BOI
- ORD
1 stop11h 10m
Southwest
Deal found 3/26![Southwest logo]()
$248
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:45 am
ORD
- GEG
1 stop8h 00m
Southwest
Sat 5/25:45 am
GEG
- ORD
1 stop6h 45m
Southwest
Deal found 3/25![Southwest logo]()
$243
This Delta deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:00 am
STL
- BOI
1 stop6h 02m
Delta
Wed 5/1312:55 pm
BOI
- STL
1 stop5h 08m
Delta
Deal found 3/27![Delta logo]()
$263
This Alaska Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
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 3/26![Alaska Airlines logo]()
$283
This Trip.com deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/295:52 pm
ORD
- BOI
1 stop7h 07m
Alaska Airlines
Fri 5/17:43 am
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$288
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:40 am
MDW
- BOI
1 stop10h 00m
Southwest
Wed 5/62:00 pm
BOI
- MDW
1 stop7h 00m
Southwest
Deal found 3/26![Southwest logo]()
$258
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 30, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated March 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/139:42 pm
ORD
- BOI
1 stop15h 45m
Frontier
Deal found 3/25![Frontier logo]()
$100
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/34:50 pm
ORD
- BOI
1 stop8h 35m
Southwest
Deal found 3/25![Southwest logo]()
$111
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:45 am
ORD
- GEG
1 stop8h 00m
Southwest
Deal found 3/26![Southwest logo]()
$111
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/88:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Deal found 3/25![Frontier logo]()
$112
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/34:00 pm
MDW
- BOI
2 stops9h 25m
Southwest
Deal found 3/25![Southwest logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/143:27 pm
ORD
- BOI
2 stops44h 41m
Frontier
Deal found 3/25![Frontier logo]()
$124
This American Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/219:54 am
ORD
- BOI
Nonstop3h 55m
American Airlines
Deal found 3/26![American Airlines logo]()
$126
This American Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2910:30 am
ORD
- GEG
Nonstop4h 02m
American Airlines
Deal found 3/26![American Airlines logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 3/30. 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.
Wed 4/298:58 pm
ORD
- GEG
1 stop25h 31m
Multiple Airlines
Deal found 3/30![Multiple Airlines logo]()
$127
This Kiwi.com deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/152:15 pm
MDW
- BOI
2 stops21h 53m
Frontier
Deal found 3/26![Frontier logo]()
$129
This Southwest deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/253:15 pm
MDW
- BOI
1 stop7h 50m
Southwest
Deal found 3/26![Southwest logo]()
$132
This American Airlines deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/67:05 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 3/26![American Airlines logo]()
$132
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 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $196 (CheapOair) |
One-way from | $100 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $397 |
Good round-trip deal | $344 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 March 30, 2026.
Use the filters below to find and compare flights from Illinois to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Wed 5/27
6:20 pm-11:59 pm
1 stop7h 39m
Spokane
Wed 6/3
1:11 pm-11:55 pm
1 stop8h 44m
$271
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Wed 4/22
12:46 pm-9:24 pm
1 stop9h 38m
Boise Air Term. Gowen Fld
Tue 4/28
10:41 am-9:18 pm
2 stops9h 37m
$276
ChicagoBoise
MDW - BOI
MDWBOI
Chicago Midway
Fri 5/1
5:00 pm-12:45 am
2 stops8h 45m
Boise Air Term. Gowen Fld
Tue 5/5
6:00 am-2:10 pm
1 stop7h 10m
$287
ChicagoBoise
ORD - BOI
ORDBOI
Chicago O'Hare Intl
Fri 5/1
4:15 pm-12:45 am
2 stops9h 30m
Boise Air Term. Gowen Fld
Tue 5/5
2:00 pm-10:55 pm
1 stop7h 55m
$287
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Wed 5/20
2:27 pm-9:44 pm
1 stop8h 17m
Boise Air Term. Gowen Fld
Thu 5/28
2:23 pm-11:21 pm
1 stop7h 58m
$290
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 4/28
5:40 pm-12:25 am
2 stops7h 45m
Boise Air Term. Gowen Fld
Wed 5/13
4:05 pm-11:15 pm
1 stop6h 10m
$295
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Sat 5/23
1:55 pm-9:35 pm
2 stops9h 40m
Spokane
Wed 6/3
2:25 pm-11:20 pm
1 stop6h 55m
$303
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 5/23
7:00 am-4:05 pm
2 stops11h 05m
Spokane
Sat 5/30
5:45 am-2:30 pm
1 stop6h 45m
$305
ChicagoSpokane
MDW - GEG
MDWGEG
Chicago Midway
Wed 5/27
4:00 pm-11:25 pm
2 stops9h 25m
Spokane
Wed 6/3
6:30 am-4:35 pm
2 stops8h 05m
$309
ChicagoSpokane
ORD - GEG
ORDGEG
Chicago O'Hare Intl
Sat 5/2
12:14 pm-6:57 pm
2 stops8h 43m
Spokane
Tue 5/5
10:40 pm-12:45 pm
2 stops12h 05m
$313
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
STL-BOI
ORD-BOI
ORD-IDA
ORD-GEG
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
STL-BOI
ORD-BOI
ORD-IDA
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 30, 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 March 30, 2026.
The most flights from USIL to USID are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 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 March 30, 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.
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Comfort
8.0
Food
7.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
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 March 30, 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 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$174 | Average$337 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$237 | Average$458 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$254 | Average$378 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$268 | Average$464 | FlexibilityNo cancel fee | On-time71% |