$116+ Cheap flights from Illinois to Idaho
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Sep 20 — Sep 271
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Idaho with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 August 21, 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 August 21, 2026.
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 11/57:00 am -
1 stop8h 57m
Mon 11/93:52 pm -
1 stop12h 43m
Deal found 8/17![Frontier logo]()
$232
This CheapOair deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/91:21 pm -
1 stop25h 34m
Mon 9/142:50 pm -
1 stop13h 48m
Deal found 8/17![Frontier logo]()
$242
This CheapOair deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/18:55 pm -
1 stop18h 00m
Mon 10/52:50 pm -
1 stop13h 48m
Deal found 8/20![Frontier logo]()
$244
This Frontier deal was found by Cheapflights users on 8/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:00 am -
1 stop8h 57m
Sun 11/83:52 pm -
1 stop12h 43m
Deal found 8/16![Frontier logo]()
$259
This CheapOair deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:21 pm -
1 stop25h 34m
Fri 9/182:50 pm -
1 stop13h 48m
Deal found 8/19![Frontier logo]()
$267
This Expedia deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:46 pm -
1 stop7h 13m
Mon 10/122:50 pm -
1 stop13h 26m
Deal found 8/20![Multiple Airlines logo]()
$278
This Alaska Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 -
1 stop7h 35m
Tue 9/292:16 pm -
1 stop8h 43m
Deal found 8/17![Alaska Airlines logo]()
$287
This Expedia deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 10/86:00 am -
1 stop7h 35m
Mon 10/122:50 pm -
1 stop13h 26m
Deal found 8/18![Multiple Airlines logo]()
$288
This Orbitz deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/65:46 pm -
1 stop7h 13m
Mon 10/122:50 pm -
1 stop13h 26m
Deal found 8/20![Multiple Airlines logo]()
$289
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/2611:10 am -
Nonstop4h 09m
Sat 10/102:08 pm -
Nonstop3h 52m
Deal found 8/17![American Airlines logo]()
$297
This American Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1211:20 am -
Nonstop4h 06m
Sat 9/192:21 pm -
Nonstop3h 54m
Deal found 8/21![American Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 10/2610:30 am -
Nonstop3h 50m
Sat 10/311:50 pm -
Nonstop3h 34m
Deal found 8/18![American Airlines logo]()
$300
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 August 21, 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 August 21, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 1/192:11 pm -
1 stop10h 33m
Sat 1/233:39 pm -
1 stop20h 34m
Deal found 8/18![Alaska Airlines logo]()
$293
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/199:59 am -
Nonstop4h 24m
Sat 9/261:40 pm -
1 stop7h 06m
Deal found 8/20![United Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/262:00 pm -
1 stop7h 31m
Sat 10/101:00 pm -
1 stop7h 33m
Deal found 8/18![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/145:40 am -
1 stop6h 50m
Mon 9/213:45 pm -
1 stop7h 05m
Deal found 8/17![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/237:49 pm -
1 stop18h 58m
Mon 10/262:06 pm -
1 stop8h 53m
Deal found 8/20![Alaska Airlines logo]()
$302
This Delta deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/76:00 am -
1 stop7h 38m
Thu 1/147:00 am -
1 stop7h 50m
Deal found 8/20![Delta logo]()
$317
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/237:44 am -
1 stop8h 47m
Mon 10/2612:31 pm -
Nonstop3h 34m
Deal found 8/20![United Airlines logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 8/16. 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 9/288:17 pm -
1 stop18h 45m
Sat 10/37:20 am -
1 stop10h 33m
Deal found 8/16![Alaska Airlines logo]()
$311
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 11/410:10 am -
2 stops8h 50m
Wed 11/111:05 pm -
2 stops7h 25m
Deal found 8/17![Southwest logo]()
$343
This Delta deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/712:40 pm -
1 stop8h 08m
Thu 1/1410:50 am -
2 stops8h 47m
Deal found 8/20![Delta logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 8/20![Alaska Airlines logo]()
$311
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/235:40 am -
1 stop6h 40m
Mon 10/262:00 pm -
2 stops10h 10m
Deal found 8/20![Southwest logo]()
$343
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:00 am -
1 stop5h 51m
Mon 9/284:05 pm -
1 stop6h 54m
Deal found 8/19![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:05 pm -
2 stops9h 06m
Sat 10/101:00 pm -
1 stop8h 57m
Deal found 8/19![Delta logo]()
$322
This Southwest deal was found by Cheapflights users on 8/16. 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 9/303:10 pm -
2 stops9h 05m
Wed 10/712:55 pm -
1 stop9h 15m
Deal found 8/16![Southwest logo]()
$344
This Delta deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 11/185:00 am -
2 stops9h 39m
Deal found 8/18![Delta logo]()
$322
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/198:47 am -
Nonstop3h 52m
Tue 9/225:53 pm -
1 stop5h 06m
Deal found 8/19![United Airlines logo]()
$381
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/106:15 pm -
1 stop6h 40m
Sat 9/124:35 pm -
2 stops10h 55m
Deal found 8/17![Southwest logo]()
$354
This Delta deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:05 am -
1 stop7h 23m
Tue 10/67:25 pm -
2 stops11h 19m
Deal found 8/20![Delta logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/167:16 pm -
1 stop21h 04m
Mon 10/191:58 pm -
1 stop9h 01m
Deal found 8/19![Alaska Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 10/66:04 am -
1 stop7h 46m
Mon 10/127:25 pm -
2 stops11h 19m
Deal found 8/17![Delta logo]()
$322
This Southwest deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:05 am -
2 stops9h 10m
Sun 10/117:50 pm -
1 stop8h 00m
Deal found 8/21![Southwest logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/237:16 pm -
1 stop21h 04m
Mon 10/263:57 pm -
1 stop20h 21m
Deal found 8/19![Alaska Airlines logo]()
$369
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/254:20 pm -
Nonstop3h 21m
Sat 10/34:28 pm -
1 stop6h 31m
Deal found 8/18![United Airlines logo]()
$431
This Delta deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/319:59 am -
2 stops8h 15m
Wed 11/189:55 am -
2 stops9h 39m
Deal found 8/19![Delta logo]()
$327
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/712:50 pm -
2 stops10h 20m
Thu 1/147:00 am -
2 stops9h 30m
Deal found 8/20![Southwest logo]()
$361
This Alaska Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 8/20![Alaska Airlines logo]()
$381
This Southwest deal was found by Cheapflights users on 8/16. 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.
Tue 9/157:50 am -
2 stops13h 00m
Tue 9/227:05 am -
2 stops9h 05m
Deal found 8/16![Southwest logo]()
$365
This Delta deal was found by Cheapflights users on 8/16. 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 1/195:35 pm -
1 stop7h 20m
Sat 1/231:43 pm -
1 stop7h 27m
Deal found 8/16![Delta logo]()
$333
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/255:00 am -
1 stop5h 53m
Fri 9/254:05 pm -
1 stop5h 41m
Deal found 8/19![United Airlines logo]()
$451
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated August 21, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated August 21, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/91:21 pm -
1 stop25h 34m
Mon 9/142:50 pm -
1 stop13h 48m
Deal found 8/17![Frontier logo]()
$242
This American Airlines deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/1211:20 am -
Nonstop4h 06m
Sat 9/192:21 pm -
Nonstop3h 54m
Deal found 8/21![American Airlines logo]()
$299
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 9/1211:20 am -
Nonstop4h 06m
Thu 9/171:53 pm -
1 stop8h 37m
Deal found 8/16![American Airlines logo]()
$307
This CheapOair deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:21 pm -
1 stop25h 34m
Fri 9/182:50 pm -
1 stop13h 48m
Deal found 8/19![Frontier logo]()
$267
This CheapOair deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/178:55 pm -
1 stop18h 00m
Mon 9/212:50 pm -
1 stop13h 48m
Deal found 8/17![Frontier logo]()
$292
This Alaska Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/188:17 pm -
1 stop18h 45m
Mon 9/212:16 pm -
1 stop8h 43m
Deal found 8/18![Alaska Airlines logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/226:00 am -
1 stop7h 35m
Tue 9/297:48 pm -
1 stop9h 32m
Deal found 8/17![Alaska Airlines logo]()
$293
This Delta deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/232:05 pm -
1 stop5h 12m
Sat 9/266:00 am -
1 stop4h 55m
Deal found 8/19![Delta logo]()
$301
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Sat 9/2611:10 am -
Nonstop4h 09m
Sat 10/102:08 pm -
Nonstop3h 52m
Deal found 8/16![American Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:50 pm -
Nonstop3h 55m
Tue 10/612:40 pm -
1 stop7h 30m
Deal found 8/20![Southwest logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 -
1 stop7h 35m
Tue 9/292:16 pm -
1 stop8h 43m
Deal found 8/17![Alaska Airlines logo]()
$287
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Wed 9/306:00 am -
1 stop7h 55m
Wed 10/72:08 pm -
Nonstop3h 52m
Deal found 8/16![American Airlines logo]()
$308
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 August 21, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated August 21, 2026.
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 11/197:00 am -
1 stop8h 57m
Deal found 8/17![Frontier logo]()
$116
This Frontier deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 11/57:00 am -
1 stop8h 57m
Deal found 8/18![Frontier logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:21 pm -
1 stop25h 34m
Deal found 8/16![Frontier logo]()
$124
This Jetabroad deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:21 pm -
1 stop25h 34m
Deal found 8/19![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:21 pm -
1 stop21h 58m
Deal found 8/16![Multiple Airlines logo]()
$136
This Frontier deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 11/137:00 am -
1 stop8h 57m
Deal found 8/17![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:21 pm -
1 stop25h 34m
Deal found 8/20![Frontier logo]()
$142
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 10/217:40 am -
2 stops31h 15m
Deal found 8/18![Frontier logo]()
$143
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:01 pm -
2 stops42h 54m
Deal found 8/20![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 10/208:01 pm -
2 stops42h 54m
Deal found 8/18![Frontier logo]()
$146
This Alaska Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 2/176:00 am -
1 stop10h 05m
Deal found 8/17![Alaska Airlines logo]()
$147
This American Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/2111:10 am -
Nonstop4h 09m
Deal found 8/17![American Airlines logo]()
$149
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 August 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $232 (Frontier) |
One-way from | $116 (Frontier) |
Popular in | June |
Cheapest in | February |
Average price | $389 |
Good round-trip deal | $380 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 August 21, 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
Tue 1/19
2:11 pm-11:44 pm
1 stop10h 33m
Boise Air Term. Gowen Fld
Sat 1/23
3:39 pm-1:13 pm
1 stop20h 34m
$293
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Fri 10/23
7:49 pm-1:47 pm
1 stop18h 58m
Boise Air Term. Gowen Fld
Mon 10/26
2:06 pm-11:59 pm
1 stop8h 53m
$302
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Sat 9/19
9:59 am-12:23 pm
Nonstop4h 24m
Spokane
Sat 9/26
1:40 pm-10:46 pm
1 stop7h 06m
$307
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Mon 9/28
8:17 pm-2:02 pm
1 stop18h 45m
Boise Air Term. Gowen Fld
Sat 10/3
7:20 am-6:53 pm
1 stop10h 33m
$311
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Tue 11/10
2:15 pm-9:29 pm
1 stop9h 14m
Spokane
Wed 11/11
12:41 pm-11:59 pm
1 stop9h 18m
$311
ChicagoSpokane
MDW Chicago Midway - GEG Spokane
MDWGEG
Chicago Midway
Sat 9/26
2:00 pm-7:31 pm
1 stop7h 31m
Spokane
Sat 10/10
1:00 pm-10:33 pm
1 stop7h 33m
$317
ChicagoSpokane
MDW Chicago Midway - GEG Spokane
MDWGEG
Chicago Midway
Thu 1/7
6:00 am-11:38 am
1 stop7h 38m
Spokane
Thu 1/14
7:00 am-4:50 pm
1 stop7h 50m
$317
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Thu 1/7
12:40 pm-6:48 pm
1 stop8h 08m
Spokane
Thu 1/14
10:50 am-9:37 pm
2 stops8h 47m
$322
ChicagoSpokane
ORD Chicago O'Hare Intl - GEG Spokane
ORDGEG
Chicago O'Hare Intl
Sat 9/26
2:05 pm-9:11 pm
2 stops9h 06m
Spokane
Sat 10/10
1:00 pm-11:57 pm
1 stop8h 57m
$322
ChicagoSpokane
MDW Chicago Midway - GEG Spokane
MDWGEG
Chicago Midway
Sat 10/31
6:04 am-11:50 am
1 stop7h 46m
Spokane
Wed 11/18
5:00 am-4:39 pm
2 stops9h 39m
$322
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-GEG
MDW-BOI
ORD-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-GEG
MDW-BOI
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 $323). Flying from Illinois to Idaho in December is currently the most expensive (average of $545). 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 August 21, 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 August 21, 2026.
The most flights from USIL to USID are scheduled on a Tuesday (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 $312 and $421 in November.The cheapest round-trip price found within the last 5 days was $232 on Frontier (Nov 5-Nov 9).
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 August 21, 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
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Food
7.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
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.
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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 August 21, 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 August 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$263 | Average$502 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$268 | Average$474 | 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$364 | FlexibilityNo cancel fee | On-time75% |