$136+ Cheap flights from Illinois to Idaho
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Oct 3 — Oct 101
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 September 3, 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 September 3, 2026.
This Expedia deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:46 pm -
1 stop7h 13m
Mon 10/192:50 pm -
1 stop13h 26m
Deal found 9/1![Multiple Airlines logo]()
$285
This Frontier deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:55 pm -
1 stop18h 00m
Thu 10/12:50 pm -
1 stop13h 48m
Deal found 9/1![Frontier logo]()
$299
This Alaska Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/297:20 am -
1 stop7h 42m
Tue 9/294:20 pm -
1 stop6h 39m
Deal found 9/2![Alaska Airlines logo]()
$303
This Booking.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:17 pm -
1 stop18h 45m
Wed 9/304:20 pm -
1 stop6h 39m
Deal found 9/2![Alaska Airlines logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:21 pm -
1 stop9h 19m
Wed 11/1812:41 pm -
1 stop9h 18m
Deal found 9/2![Alaska Airlines logo]()
$309
This CheapOair deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/2312:17 pm -
1 stop26h 38m
Fri 9/252:50 pm -
1 stop19h 42m
Deal found 8/31![Frontier logo]()
$312
This Alaska Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/103:59 pm -
1 stop8h 50m
Wed 11/111:53 pm -
1 stop9h 06m
Deal found 9/1![Alaska Airlines logo]()
$326
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:10 am -
1 stop5h 43m
Tue 10/64:05 pm -
1 stop6h 39m
Deal found 9/1![United Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:40 am -
Nonstop3h 48m
Tue 9/2912:26 pm -
Nonstop3h 39m
Deal found 9/1![United Airlines logo]()
$329
This American Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/319:44 am -
Nonstop4h 06m
Wed 11/182:13 pm -
Nonstop3h 54m
Deal found 9/2![American Airlines logo]()
$329
This CheapOair deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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.
Thu 9/1012:17 pm -
1 stop26h 38m
Sun 9/272:50 pm -
1 stop19h 27m
Deal found 9/3![Frontier logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 10/71:21 pm -
1 stop25h 34m
Mon 10/122:50 pm -
2 stops38h 44m
Deal found 8/31![Frontier logo]()
$335
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 September 3, 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 September 3, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:15 pm -
1 stop9h 14m
Wed 11/1112:41 pm -
1 stop9h 18m
Deal found 8/29![Alaska Airlines logo]()
$337
This United Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:40 am -
Nonstop3h 48m
Sat 10/246:50 pm -
1 stop10h 09m
Deal found 9/2![United Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:15 am -
1 stop5h 30m
Sat 10/244:55 pm -
1 stop6h 20m
Deal found 9/2![Southwest logo]()
$349
This Delta deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:50 pm -
1 stop7h 09m
Sat 10/38:55 am -
2 stops12h 05m
Deal found 9/1![Delta logo]()
$354
This American Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:21 am -
1 stop8h 10m
Tue 9/291:52 pm -
2 stops9h 35m
Deal found 9/3![American Airlines logo]()
$401
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:17 pm -
1 stop24h 47m
Mon 9/216:21 pm -
2 stops47h 56m
Deal found 9/2![Multiple Airlines logo]()
$514
This Alaska Airlines deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 1/198:00 am -
1 stop9h 20m
Sat 1/2311:10 am -
1 stop11h 49m
Deal found 8/31![Alaska Airlines logo]()
$345
This Southwest deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:40 am -
1 stop5h 35m
Tue 10/612:45 pm -
1 stop7h 30m
Deal found 9/1![Southwest logo]()
$349
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/45:30 pm -
1 stop5h 55m
Wed 11/118:59 am -
2 stops11h 34m
Deal found 9/2![Delta logo]()
$354
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/291:29 pm -
2 stops10h 04m
Tue 10/62:44 pm -
1 stop4h 52m
Deal found 9/1![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:05 am -
1 stop6h 10m
Sat 11/141:35 pm -
1 stop6h 40m
Deal found 9/2![Southwest logo]()
$349
This Delta deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:10 am -
1 stop8h 34m
Tue 10/66:45 am -
2 stops10h 25m
Deal found 9/1![Delta logo]()
$354
This Alaska Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/217:00 am -
1 stop7h 54m
Mon 10/264:41 pm -
1 stop10h 59m
Deal found 8/30![Alaska Airlines logo]()
$356
This American Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/410:21 am -
2 stops10h 03m
Fri 11/62:03 pm -
2 stops8h 30m
Deal found 9/2![American Airlines logo]()
$406
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/119:59 am -
2 stops10h 58m
Sat 11/141:03 pm -
1 stop6h 30m
Deal found 9/2![Delta logo]()
$354
This Southwest deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 9/246:15 am -
2 stops11h 20m
Sat 10/35:30 am -
2 stops11h 10m
Deal found 9/3![Southwest logo]()
$359
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/254:39 pm -
1 stop5h 30m
Sat 11/285:40 pm -
1 stop4h 52m
Deal found 9/1![United Airlines logo]()
$401
This Alaska Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/53:54 pm -
1 stop7h 28m
Wed 1/66:37 am -
1 stop7h 19m
Deal found 9/2![Alaska Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:55 pm -
2 stops11h 55m
Sat 10/177:05 am -
1 stop7h 48m
Deal found 9/2![Delta logo]()
$354
This Southwest deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:25 am -
1 stop10h 40m
Tue 10/206:05 am -
1 stop7h 40m
Deal found 9/1![Southwest logo]()
$363
This United Airlines deal was found by Cheapflights users on 8/29. 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.
Sat 2/61:09 pm -
2 stops8h 59m
Tue 2/92:35 pm -
1 stop5h 24m
Deal found 8/29![United Airlines logo]()
$424
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/196:00 am -
2 stops11h 00m
Sat 1/236:00 am -
2 stops9h 37m
Deal found 9/2![Delta logo]()
$359
This American Airlines deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/215:00 am -
1 stop8h 42m
Wed 1/271:23 pm -
1 stop7h 42m
Deal found 8/29![American Airlines logo]()
$480
This Alaska Airlines deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/296:00 am -
2 stops11h 11m
Tue 9/296:49 pm -
1 stop17h 33m
Deal found 8/29![Alaska Airlines logo]()
$402
This Southwest deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:15 pm -
1 stop7h 30m
Tue 10/206:35 am -
2 stops9h 05m
Deal found 9/2![Southwest logo]()
$371
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:31 pm -
1 stop7h 28m
Tue 10/205:30 am -
1 stop5h 17m
Deal found 9/2![Delta logo]()
$366
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:50 pm -
Nonstop3h 55m
Mon 10/56:15 pm -
2 stops9h 25m
Deal found 8/30![Southwest logo]()
$372
This Alaska Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/126:00 am -
1 stop7h 37m
Thu 9/178:39 pm -
1 stop7h 41m
Deal found 9/1![Alaska Airlines logo]()
$411
This United Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/510:50 am -
2 stops11h 45m
Wed 1/68:00 am -
1 stop8h 54m
Deal found 8/30![United Airlines logo]()
$464
This Delta deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:20 am -
1 stop7h 15m
Tue 10/206:45 am -
2 stops10h 25m
Deal found 9/2![Delta logo]()
$371
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated September 3, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated September 3, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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.
Thu 9/1012:17 pm -
1 stop26h 38m
Sun 9/272:50 pm -
1 stop19h 27m
Deal found 9/3![Frontier logo]()
$333
This Alaska Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:00 pm -
1 stop15h 56m
Tue 9/296:49 pm -
1 stop17h 33m
Deal found 9/1![Alaska Airlines logo]()
$326
This CheapOair deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/2312:17 pm -
1 stop26h 38m
Fri 9/252:50 pm -
1 stop19h 42m
Deal found 8/31![Frontier logo]()
$312
This Frontier deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:55 pm -
1 stop18h 00m
Thu 10/12:50 pm -
1 stop13h 48m
Deal found 9/1![Frontier logo]()
$299
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/268:40 am -
Nonstop3h 48m
Tue 9/2912:26 pm -
Nonstop3h 39m
Deal found 9/1![United Airlines logo]()
$329
This Booking.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:17 pm -
1 stop18h 45m
Wed 9/304:20 pm -
1 stop6h 39m
Deal found 9/2![Alaska Airlines logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/297:20 am -
1 stop7h 42m
Tue 9/294:20 pm -
1 stop6h 39m
Deal found 9/2![Alaska Airlines logo]()
$303
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:10 am -
1 stop5h 43m
Tue 10/64:05 pm -
1 stop6h 39m
Deal found 9/1![United Airlines logo]()
$329
This Expedia deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 10/39:00 am -
1 stop7h 23m
Thu 10/82:50 pm -
1 stop13h 26m
Deal found 9/3![Multiple Airlines logo]()
$285
This Trip.com deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:00 am -
1 stop7h 35m
Thu 10/296:43 am -
1 stop7h 10m
Deal found 9/3![Alaska Airlines logo]()
$320
This Alaska Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:21 pm -
1 stop9h 19m
Wed 11/1812:41 pm -
1 stop9h 18m
Deal found 9/2![Alaska Airlines logo]()
$309
This American Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/319:44 am -
Nonstop4h 06m
Wed 11/182:13 pm -
Nonstop3h 54m
Deal found 9/2![American Airlines logo]()
$329
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 September 3, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated September 3, 2026.
This CheapOair deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:51 pm -
1 stop30h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$136
This Alaska Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” 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 2/276:00 am -
1 stop10h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Alaska Airlines logo]()
$155
This Alaska Airlines deal was found by Cheapflights users on 9/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:21 pm -
1 stop9h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Alaska Airlines logo]()
$155
This CheapOair deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/231:21 pm -
1 stop25h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![Frontier logo]()
$158
This Booking.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:17 pm -
1 stop18h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Alaska Airlines logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/71:21 pm -
1 stop25h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![Frontier logo]()
$164
This United Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:00 am -
1 stop5h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/30![United Airlines logo]()
$165
This United Airlines deal was found by Cheapflights users on 9/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/308:40 am -
Nonstop3h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/1![United Airlines logo]()
$165
This American Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2411:10 am -
Nonstop4h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![American Airlines logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/301:21 pm -
1 stop25h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 8/30. 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 10/216:35 pm -
2 stops43h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/30![Multiple Airlines logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 12/22:59 pm -
2 stops28h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 8/31![Frontier logo]()
$168
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 September 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $285 (Expedia) |
One-way from | $136 (CheapOair) |
Popular in | June |
Cheapest in | February |
Average price | $411 |
Good round-trip deal | $371 or less |
Good one-way deal | $249 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 7,457,451 searches. Data last updated September 3, 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
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 12/3
6:00 am-3:05 pm
1 stop10h 05m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$155
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Wed 11/4
2:15 pm-9:29 pm
1 stop9h 14m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$155
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Wed 10/21
9:00 am-1:24 pm
1 stop5h 24m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$165
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Mon 9/28
8:40 am-11:28 am
Nonstop3h 48m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$165
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Wed 10/21
6:35 pm-1:34 pm
2 stops43h 59m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$167
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Wed 12/2
2:59 pm-6:01 pm
2 stops28h 02m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$168
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Wed 9/23
3:52 pm-10:25 pm
1 stop8h 33m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Tue 10/6
2:21 pm-9:40 pm
1 stop9h 19m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$169
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 10/3
9:00 am-3:23 pm
1 stop7h 23m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$173
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Wed 10/21
9:05 am-4:00 pm
1 stop7h 55m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$175
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
STL-BOI
STL-IDA
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
STL-BOI
STL-IDA
What is the cheapest month to book a flight from Illinois to Idaho?
Currently, February is the cheapest month in which you can book a flight from Illinois to Idaho (average of $327). Flying from Illinois to Idaho in December is currently the most expensive (average of $542). 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 September 3, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 13% 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 September 3, 2026.
The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 on average).
How much does it cost to fly round-trip from Illinois to Idaho?
Airfare is below average for this route at the moment.
Illinois to Idaho flights typically cost between $315 and $405 in October.The cheapest round-trip price found within the last 5 days was $285 on Multiple Airlines (Oct 15-Oct 19).
How far ahead should I book a flight from Illinois to Idaho?
The best time to book flights from Illinois to Idaho is 74 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated September 3, 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
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Comfort
8.0
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Comfort
8.0
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Comfort
8.0
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Comfort
8.0
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Comfort
8.0
Crew
8.6
Overall
8.0
Boarding
8.1
Food
7.0
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Idaho by cabin class
Find flights from Illinois to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Idaho flights
Browse other Illinois and Idaho flight options. Last updated on September 3, 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 5 airlines flying from Illinois to Idaho
Discover the top 5 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 7,457,451 searches. Data last updated September 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$263 | Average$504 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$472 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$288 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$372 | FlexibilityNo cancel fee | On-time75% |