$105+ 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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Oct 17 — Oct 241
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 September 17, 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 17, 2026.
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:46 pm -
1 stop7h 13m
Wed 10/216:43 am -
1 stop9h 07m
Deal found 9/15![Alaska Airlines logo]()
$219
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 12/85:29 pm -
1 stop8h 29m
Tue 12/1512:37 pm -
1 stop9h 22m
Deal found 9/16![Alaska Airlines logo]()
$219
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/48:40 am -
Nonstop3h 51m
Wed 11/1112:31 pm -
Nonstop3h 34m
Deal found 9/16![United Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 11/47:20 am -
1 stop13h 33m
Thu 11/124:16 pm -
1 stop6h 43m
Deal found 9/15![Alaska Airlines logo]()
$233
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/76:00 am -
1 stop7h 30m
Tue 12/157:07 am -
1 stop9h 53m
Deal found 9/16![Alaska Airlines logo]()
$236
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 10/204:05 pm -
1 stop8h 54m
Sat 10/2412:26 pm -
Nonstop3h 39m
Deal found 9/14![United Airlines logo]()
$237
This Expedia deal was found by Cheapflights users on 9/15. 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 10/156:00 am -
1 stop7h 35m
Thu 10/226:04 pm -
1 stop10h 36m
Deal found 9/15![Alaska Airlines logo]()
$239
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/179:44 am -
Nonstop4h 06m
Wed 10/212:08 pm -
Nonstop3h 52m
Deal found 9/15![American Airlines logo]()
$239
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:35 am -
Nonstop3h 58m
Wed 10/213:24 pm -
Nonstop3h 47m
Deal found 9/15![American Airlines logo]()
$243
This Expedia deal was found by Cheapflights users on 9/15. 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.
Wed 11/42:07 pm -
1 stop6h 59m
Thu 11/122:49 pm -
1 stop13h 24m
Deal found 9/15![Multiple Airlines logo]()
$246
This Delta deal was found by Cheapflights users on 9/14. 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.
Tue 10/206:04 am -
1 stop8h 30m
Sat 10/241:40 pm -
1 stop7h 53m
Deal found 9/14![Delta logo]()
$247
This Delta deal was found by Cheapflights users on 9/14. 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.
Tue 10/206:30 am -
1 stop8h 04m
Sat 10/241:40 pm -
1 stop9h 17m
Deal found 9/14![Delta logo]()
$247
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 17, 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 17, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/317:00 am -
1 stop9h 40m
Wed 11/1812:41 pm -
1 stop9h 18m
Deal found 9/16![Alaska Airlines logo]()
$219
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/42:30 pm -
1 stop7h 45m
Wed 11/115:44 pm -
1 stop5h 15m
Deal found 9/16![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/48:10 am -
2 stops8h 00m
Wed 11/113:45 pm -
1 stop7h 30m
Deal found 9/16![Southwest logo]()
$252
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 10/316:04 am -
1 stop7h 46m
Wed 11/181:08 pm -
1 stop7h 46m
Deal found 9/15![Delta logo]()
$259
This American Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/611:35 am -
2 stops12h 24m
Tue 11/106:36 am -
2 stops11h 46m
Deal found 9/16![American Airlines logo]()
$411
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 11/42:03 pm -
2 stops9h 05m
Thu 11/121:14 pm -
2 stops9h 40m
Deal found 9/15![Delta logo]()
$273
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/59:15 am -
Nonstop4h 24m
Wed 10/71:38 pm -
1 stop8h 21m
Deal found 9/15![United Airlines logo]()
$308
This Delta deal was found by Cheapflights users on 9/15. 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.
Mon 10/55:10 pm -
2 stops8h 49m
Wed 10/73:30 pm -
1 stop6h 04m
Deal found 9/15![Delta logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 9/12. 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.
Wed 11/47:20 am -
1 stop13h 26m
Wed 11/1112:49 pm -
1 stop10h 10m
Deal found 9/12![Alaska Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 9/15. 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.
Mon 10/55:10 pm -
2 stops8h 49m
Tue 10/137:25 pm -
2 stops10h 16m
Deal found 9/15![Delta logo]()
$286
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:15 pm -
1 stop7h 30m
Thu 10/226:15 pm -
2 stops9h 25m
Deal found 9/15![Southwest logo]()
$352
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:05 am -
1 stop5h 40m
Sun 10/258:10 pm -
1 stop8h 40m
Deal found 9/15![Southwest logo]()
$356
This United Airlines deal was found by Cheapflights users on 9/14. 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 10/298:40 am -
1 stop5h 48m
Wed 11/45:30 pm -
1 stop5h 29m
Deal found 9/14![United Airlines logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 10/247:00 am -
1 stop9h 20m
Wed 10/286:09 am -
1 stop9h 41m
Deal found 9/15![Alaska Airlines logo]()
$381
This Delta deal was found by Cheapflights users on 9/15. 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.
Wed 10/712:50 pm -
1 stop7h 55m
Sun 10/115:10 am -
1 stop6h 20m
Deal found 9/15![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 9/13. 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 10/219:15 am -
Nonstop4h 24m
Mon 10/261:49 pm -
1 stop8h 10m
Deal found 9/13![United Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 9/14. 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.
Thu 10/295:40 am -
1 stop6h 40m
Thu 11/511:15 am -
2 stops8h 05m
Deal found 9/14![Southwest logo]()
$404
This Delta deal was found by Cheapflights users on 9/14. 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 2/247:30 am -
1 stop5h 57m
Sun 2/286:00 am -
1 stop5h 25m
Deal found 9/14![Delta logo]()
$360
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/58:40 am -
Nonstop3h 51m
Mon 11/912:31 pm -
Nonstop3h 34m
Deal found 9/16![United Airlines logo]()
$399
This Alaska Airlines deal was found by Cheapflights users on 9/12. 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 10/235:46 pm -
1 stop22h 34m
Mon 10/261:58 pm -
1 stop9h 01m
Deal found 9/12![Alaska Airlines logo]()
$439
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/35:20 am -
1 stop7h 40m
Sat 2/67:00 am -
2 stops8h 25m
Deal found 9/11![Southwest logo]()
$410
This Orbitz deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/49:00 am -
1 stop14h 56m
Mon 12/76:00 am -
1 stop7h 21m
Deal found 9/16![Alaska Airlines logo]()
$439
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/137:00 am -
1 stop7h 28m
Sun 11/155:30 pm -
1 stop5h 29m
Deal found 9/15![United Airlines logo]()
$401
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/249:59 am -
2 stops8h 56m
Tue 12/13:44 pm -
1 stop7h 18m
Deal found 9/16![Delta logo]()
$373
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/205:40 pm -
1 stop6h 45m
Fri 11/275:50 am -
1 stop9h 50m
Deal found 9/15![Southwest logo]()
$432
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:00 am -
1 stop7h 21m
Tue 10/64:05 pm -
1 stop6h 39m
Deal found 9/15![United Airlines logo]()
$407
This Alaska Airlines deal was found by Cheapflights users on 9/12. 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.
Sat 10/107:00 am -
1 stop9h 23m
Sat 10/175:59 am -
2 stops11h 54m
Deal found 9/12![Alaska Airlines logo]()
$451
This Delta deal was found by Cheapflights users on 9/15. 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.
Fri 11/205:55 pm -
1 stop7h 04m
Tue 11/243:38 pm -
1 stop7h 21m
Deal found 9/15![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/54:05 pm -
1 stop9h 40m
Wed 10/712:45 pm -
1 stop7h 30m
Deal found 9/15![Southwest logo]()
$434
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/185:10 am -
1 stop5h 43m
Thu 10/224:05 pm -
1 stop6h 39m
Deal found 9/16![United Airlines logo]()
$415
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated September 17, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 9/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/135:50 pm -
1 stop6h 25m
Tue 10/2011:55 am -
2 stops8h 05m
Deal found 9/15![Southwest logo]()
$253
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Wed 10/147:20 am -
1 stop7h 27m
Wed 10/218:25 am -
1 stop7h 25m
Deal found 9/16![Alaska Airlines logo]()
$227
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/155:46 pm -
1 stop7h 13m
Wed 10/216:43 am -
1 stop9h 07m
Deal found 9/15![Alaska Airlines logo]()
$219
This Expedia deal was found by Cheapflights users on 9/15. 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 10/156:00 am -
1 stop7h 35m
Thu 10/226:04 pm -
1 stop10h 36m
Deal found 9/15![Alaska Airlines logo]()
$239
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1511:35 am -
Nonstop3h 58m
Wed 10/213:24 pm -
Nonstop3h 47m
Deal found 9/15![American Airlines logo]()
$243
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/179:44 am -
Nonstop4h 06m
Wed 10/212:08 pm -
Nonstop3h 52m
Deal found 9/15![American Airlines logo]()
$239
This United Airlines deal was found by Cheapflights users on 9/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/179:00 am -
Nonstop4h 24m
Wed 10/211:38 pm -
1 stop8h 21m
Deal found 9/15![United Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Tue 10/204:05 pm -
1 stop8h 54m
Sat 10/2412:26 pm -
Nonstop3h 39m
Deal found 9/14![United Airlines logo]()
$237
This Southwest deal was found by Cheapflights users on 9/14. 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.
Tue 10/205:45 am -
1 stop6h 55m
Sat 10/2411:25 am -
1 stop6h 15m
Deal found 9/14![Southwest logo]()
$247
This Delta deal was found by Cheapflights users on 9/14. 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.
Tue 10/206:30 am -
1 stop8h 04m
Sat 10/241:40 pm -
1 stop9h 17m
Deal found 9/14![Delta logo]()
$247
This Delta deal was found by Cheapflights users on 9/14. 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.
Tue 10/206:04 am -
1 stop8h 30m
Sat 10/246:00 am -
2 stops9h 47m
Deal found 9/14![Delta logo]()
$252
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/317:00 am -
1 stop9h 40m
Wed 11/1812:41 pm -
1 stop9h 18m
Deal found 9/16![Alaska Airlines logo]()
$219
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 17, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This CheapOair deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 12/1612:51 pm -
1 stop30h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 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 9/14![Frontier logo]()
$107
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 10/172:21 pm -
1 stop9h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Alaska Airlines logo]()
$110
This Alaska Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/147:20 am -
1 stop7h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Alaska Airlines logo]()
$114
This Expedia deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 12/167:27 am -
1 stop13h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Alaska Airlines logo]()
$115
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/155:46 pm -
1 stop7h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Alaska Airlines logo]()
$120
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/179:44 am -
Nonstop4h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![American Airlines logo]()
$120
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 10/145:31 pm -
1 stop7h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$124
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/176:23 am -
1 stop7h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$124
This Priceline deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Thu 10/157:16 pm -
1 stop6h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Alaska Airlines logo]()
$127
This Delta deal was found by Cheapflights users on 9/15. 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.
Sat 11/1412:30 pm -
2 stops10h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Delta logo]()
$129
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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 11/146:23 am -
2 stops11h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$129
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 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $219 (Trip.com) |
One-way from | $105 (CheapOair) |
Popular in | June |
Cheapest in | February |
Average price | $411 |
Good round-trip deal | $369 or less |
Good one-way deal | $216 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 17, 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
Sat 11/14
2:15 pm-10:39 pm
1 stop9h 24m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$114
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 10/17
12:00 pm-6:33 pm
1 stop7h 33m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$124
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Thu 11/12
2:15 pm-9:35 pm
1 stop9h 20m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$127
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Wed 12/16
1:02 pm-12:10 am
2 stops12h 08m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sat 12/12
10:24 am-6:36 pm
2 stops9h 12m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Wed 11/18
2:44 pm-12:10 am
2 stops10h 26m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Tue 10/13
5:50 pm-11:15 pm
1 stop6h 25m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$132
ChicagoSpokane
MDW Chicago Midway - GEG Spokane
MDWGEG
Chicago Midway
Tue 10/20
6:05 am-10:15 am
1 stop6h 10m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$132
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Tue 11/17
2:44 pm-11:52 pm
2 stops11h 08m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$135
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Mon 12/14
7:46 pm-10:15 pm
Nonstop4h 29m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$137
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
MDW-BOI
MDW-GEG
STL-JAC
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
MDW-BOI
MDW-GEG
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 17, 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 17, 2026.
The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Friday, 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 $323 and $405 in October.The cheapest round-trip price found within the last 5 days was $219 on Alaska Airlines (Oct 15-Oct 21).
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 17, 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.
Overall
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Overall
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Overall
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Overall
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Overall
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Overall
8.0
Boarding
8.1
Entertainment
7.5
Food
7.0
Crew
8.6
Comfort
8.0
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
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 17, 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 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$460 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$269 | Average$505 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$288 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$372 | FlexibilityNo cancel fee | On-time75% |