$138+ 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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Nov 14 — Nov 211
Round-trip
1 adult, Economy
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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 October 15, 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 October 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/224:10 pm -
2 stops26h 51m
Tue 12/296:56 pm -
1 stop9h 10m
Deal found 10/11![Frontier logo]()
$289
This Travelocity deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/163:19 pm -
1 stop9h 40m
Mon 12/216:56 pm -
1 stop9h 10m
Deal found 10/10![Multiple Airlines logo]()
$298
This Priceline deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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.
Tue 12/156:00 am -
1 stop7h 21m
Tue 12/226:56 pm -
1 stop9h 10m
Deal found 10/14![Multiple Airlines logo]()
$317
This Alaska Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/42:07 pm -
1 stop6h 59m
Wed 11/116:43 pm -
1 stop17h 34m
Deal found 10/13![Alaska Airlines logo]()
$323
This Kiwi.com deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 12/167:25 am -
2 stops35h 36m
Tue 12/296:56 pm -
1 stop9h 10m
Deal found 10/13![Frontier logo]()
$326
This United Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/107:00 am -
1 stop7h 28m
Tue 11/172:35 pm -
1 stop5h 55m
Deal found 10/11![United Airlines logo]()
$341
This Alaska Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 11/116:35 pm -
1 stop15h 32m
Wed 11/1812:49 pm -
1 stop10h 10m
Deal found 10/14![Alaska Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 11/67:45 pm -
Nonstop4h 06m
Tue 11/1012:31 pm -
Nonstop3h 34m
Deal found 10/12![United Airlines logo]()
$343
This Expedia deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/236:57 pm -
1 stop15h 47m
Mon 12/286:56 pm -
1 stop9h 10m
Deal found 10/11![Multiple Airlines logo]()
$346
This United Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 12/98:45 am -
1 stop5h 54m
Tue 12/158:00 am -
Nonstop3h 47m
Deal found 10/13![United Airlines logo]()
$349
This Expedia deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/127:00 am -
1 stop8h 27m
Thu 11/192:49 pm -
1 stop13h 24m
Deal found 10/15![Multiple Airlines logo]()
$350
This American Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/209:45 am -
Nonstop3h 53m
Mon 11/231:24 pm -
Nonstop3h 45m
Deal found 10/11![American Airlines logo]()
$351
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 October 15, 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 October 15, 2026.
This Alaska Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 11/42:07 pm -
1 stop6h 59m
Wed 11/116:43 pm -
1 stop17h 34m
Deal found 10/14![Alaska Airlines logo]()
$323
This Delta deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 1/209:30 am -
2 stops9h 44m
Sat 1/231:10 pm -
1 stop7h 43m
Deal found 10/12![Delta logo]()
$346
This United Airlines deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/166:30 pm -
Nonstop4h 22m
Mon 12/212:43 pm -
1 stop6h 59m
Deal found 10/10![United Airlines logo]()
$353
This Southwest deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 1/16:05 am -
1 stop5h 55m
Tue 1/56:20 am -
1 stop6h 50m
Deal found 10/14![Southwest logo]()
$363
This American Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/217:10 am -
2 stops11h 57m
Sat 1/237:00 am -
1 stop8h 33m
Deal found 10/11![American Airlines logo]()
$364
This Southwest deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/166:05 am -
1 stop5h 55m
Mon 12/214:10 pm -
1 stop7h 00m
Deal found 10/10![Southwest logo]()
$363
This Delta deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 11/45:31 pm -
1 stop5h 54m
Wed 11/115:30 am -
1 stop5h 20m
Deal found 10/12![Delta logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 12/253:19 pm -
1 stop7h 59m
Wed 12/305:35 am -
1 stop6h 35m
Deal found 10/13![Alaska Airlines logo]()
$383
This United Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/208:40 am -
Nonstop3h 51m
Fri 11/275:44 pm -
1 stop5h 15m
Deal found 10/13![United Airlines logo]()
$387
This Delta deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:35 am -
1 stop5h 41m
Mon 11/98:49 am -
1 stop8h 16m
Deal found 10/11![Delta logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 1/272:11 pm -
1 stop24h 08m
Sun 1/313:58 pm -
1 stop20h 15m
Deal found 10/15![Alaska Airlines logo]()
$391
This American Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 10/2711:33 am -
2 stops12h 17m
Sat 10/312:02 pm -
2 stops8h 15m
Deal found 10/12![American Airlines logo]()
$439
This Delta deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/121:00 pm -
2 stops12h 04m
Sat 1/161:43 pm -
1 stop7h 27m
Deal found 10/10![Delta logo]()
$368
This Southwest deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 12/215:15 pm -
1 stop9h 15m
Sat 12/2610:15 pm -
1 stop6h 30m
Deal found 10/14![Southwest logo]()
$411
This United Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:25 am -
2 stops11h 17m
Mon 11/22:51 pm -
1 stop5h 15m
Deal found 10/14![United Airlines logo]()
$434
This Delta deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/46:20 am -
2 stops11h 54m
Wed 11/118:55 am -
1 stop6h 52m
Deal found 10/13![Delta logo]()
$368
This American Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/64:43 pm -
1 stop6h 59m
Sun 11/82:41 pm -
1 stop7h 28m
Deal found 10/12![American Airlines logo]()
$459
This Delta deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 1/66:30 am -
1 stop8h 52m
Tue 1/1211:30 am -
2 stops9h 07m
Deal found 10/14![Delta logo]()
$368
This Alaska Airlines deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/313:49 pm -
1 stop8h 10m
Sun 11/16:04 am -
1 stop7h 56m
Deal found 10/10![Alaska Airlines logo]()
$458
This United Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 1/308:40 am -
1 stop5h 48m
Wed 2/32:30 pm -
1 stop5h 40m
Deal found 10/14![United Airlines logo]()
$459
This Delta deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/127:30 am -
1 stop5h 47m
Sat 1/168:40 am -
2 stops12h 13m
Deal found 10/10![Delta logo]()
$368
This American Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/205:19 pm -
1 stop8h 13m
Tue 1/56:30 am -
1 stop8h 06m
Deal found 10/13![American Airlines logo]()
$491
This United Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 1/95:41 pm -
1 stop6h 34m
Wed 1/132:35 pm -
1 stop5h 35m
Deal found 10/14![United Airlines logo]()
$469
This Alaska Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 2/112:03 pm -
1 stop25h 24m
Tue 2/166:15 am -
1 stop6h 57m
Deal found 10/14![Alaska Airlines logo]()
$474
This Delta deal was found by Cheapflights users on 10/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/45:35 pm -
1 stop7h 20m
Thu 1/75:40 am -
1 stop5h 11m
Deal found 10/10![Delta logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 10/303:49 pm -
1 stop8h 10m
Sun 11/16:04 am -
1 stop7h 56m
Deal found 10/12![Alaska Airlines logo]()
$488
This Delta deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 1/266:00 am -
2 stops7h 27m
Tue 2/26:45 pm -
2 stops12h 49m
Deal found 10/15![Delta logo]()
$372
This United Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/148:46 am -
1 stop5h 42m
Wed 11/182:35 pm -
1 stop5h 37m
Deal found 10/13![United Airlines logo]()
$529
This Alaska Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/198:00 am -
1 stop11h 55m
Sat 1/2311:23 am -
2 stops24h 50m
Deal found 10/11![Alaska Airlines logo]()
$512
This American Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 11/126:00 am -
1 stop7h 37m
Sun 11/152:41 pm -
1 stop7h 39m
Deal found 10/12![American Airlines logo]()
$621
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated October 15, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated October 15, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/42:07 pm -
1 stop6h 59m
Wed 11/116:43 pm -
1 stop17h 34m
Deal found 10/13![Alaska Airlines logo]()
$323
This Delta deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/45:31 pm -
1 stop5h 54m
Wed 11/115:30 am -
1 stop5h 20m
Deal found 10/13![Delta logo]()
$363
This United Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 11/67:45 pm -
Nonstop4h 06m
Tue 11/1012:31 pm -
Nonstop3h 34m
Deal found 10/12![United Airlines logo]()
$343
This Alaska Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 11/66:35 pm -
1 stop15h 32m
Mon 11/91:53 pm -
1 stop9h 06m
Deal found 10/14![Alaska Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 11/66:35 am -
1 stop9h 45m
Tue 11/106:40 am -
1 stop9h 07m
Deal found 10/12![Delta logo]()
$363
This Delta deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 11/66:35 am -
1 stop9h 45m
Mon 11/911:10 pm -
2 stops10h 29m
Deal found 10/13![Delta logo]()
$368
This United Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/107:00 am -
1 stop7h 28m
Tue 11/172:35 pm -
1 stop5h 55m
Deal found 10/11![United Airlines logo]()
$341
This Alaska Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 11/116:35 pm -
1 stop15h 32m
Wed 11/1812:49 pm -
1 stop10h 10m
Deal found 10/14![Alaska Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 11/117:00 am -
1 stop7h 28m
Sat 11/144:30 pm -
1 stop5h 16m
Deal found 10/12![United Airlines logo]()
$361
This Expedia deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 11/127:00 am -
1 stop8h 27m
Thu 11/192:49 pm -
1 stop13h 24m
Deal found 10/15![Multiple Airlines logo]()
$350
This American Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/179:45 am -
Nonstop3h 52m
Sun 11/222:42 pm -
1 stop7h 26m
Deal found 10/11![American Airlines logo]()
$361
This American Airlines deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/209:45 am -
Nonstop3h 53m
Mon 11/231:24 pm -
Nonstop3h 45m
Deal found 10/11![American Airlines logo]()
$351
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 October 15, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated October 15, 2026.
This Frontier deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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.
Mon 1/117:30 am -
1 stop12h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Frontier logo]()
$138
This Frontier deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/87:30 am -
1 stop12h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/11![Frontier logo]()
$142
This CheapOair deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 12/36:21 am -
1 stop15h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Frontier logo]()
$151
This Cheapflightsfares deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:21 am -
1 stop15h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/13![Frontier logo]()
$154
This Alaska Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” 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 1/128:00 am -
1 stop7h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/13![Alaska Airlines logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 10/15. Clicking the “Pick Dates” 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 12/109:39 pm -
1 stop24h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/15![Multiple Airlines logo]()
$166
This Alaska Airlines deal was found by Cheapflights users on 10/14. Clicking the “Pick Dates” 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 11/136:35 pm -
1 stop15h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/14![Alaska Airlines logo]()
$167
This Delta deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 1/127:30 am -
1 stop5h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/12![Delta logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 12/1011:38 am -
1 stop23h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/12![Multiple Airlines logo]()
$172
This American Airlines deal was found by Cheapflights users on 10/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/139:45 am -
Nonstop3h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/13![American Airlines logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 10/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/136:21 am -
2 stops26h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/11![Multiple Airlines logo]()
$175
This Kiwi.com deal was found by Cheapflights users on 10/12. Clicking the “Pick Dates” 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 1/148:14 pm -
1 stop14h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/12![Multiple Airlines logo]()
$179
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 October 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $260 (Cheapflightsfares) |
One-way from | $138 (Frontier) |
Popular in | December |
Cheapest in | February |
Average price | $382 |
Good round-trip deal | $372 or less |
Good one-way deal | $264 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 October 15, 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
Wed 1/13
2:11 pm-8:04 pm
1 stop6h 53m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$162
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 11/14
2:07 pm-11:46 pm
1 stop10h 39m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$167
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
Sat 4/10
5:00 pm-10:19 pm
1 stop6h 19m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$171
Quickest round-trip
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Mon 1/11
7:53 pm-11:15 pm
Nonstop4h 22m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$172
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
Tue 1/12
11:10 am-10:19 pm
2 stops12h 09m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$176
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
Tue 12/8
2:41 pm-10:07 pm
2 stops8h 26m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$176
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Fri 12/25
6:05 am-11:00 am
1 stop5h 55m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Tue 1/12
3:45 pm-10:10 pm
1 stop7h 25m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 11/12
7:00 am-1:45 pm
1 stop7h 45m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Mon 11/16
5:29 pm-11:59 pm
1 stop7h 30m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
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-IDA
MDW-BOI
PIA-IDA
PIA-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-IDA
MDW-BOI
PIA-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 $537). 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 October 15, 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 October 15, 2026.
The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (8 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 $353 and $503 in January.The cheapest round-trip price found within the last 5 days was $260 on Frontier (Jan 4-Jan 7).
How far ahead should I book a flight from Illinois to Idaho?
The best time to book flights from Illinois to Idaho is 56 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 October 15, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, andDelta from Illinois to Idaho. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
Food
7.0
Boarding
8.1
Crew
8.5
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
2.0
MediocreChris,Aug 2026
GEG - SFO
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 October 15, 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 October 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$272 | Average$509 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$288 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$473 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$348 | Average$372 | FlexibilityNo cancel fee | On-time75% |