$179+ 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 12/22. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Dec 13 — Dec 201
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Idaho
Cheapest
Best
Last-minute
One-way
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 November 13, 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 November 13, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 11/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:21 am -
1 stop13h 40m
Mon 12/76:15 pm -
1 stop9h 46m
Deal found 11/12![Frontier logo]()
$288
This Cheapflightsfares deal was found by Cheapflights users on 11/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:21 am -
1 stop11h 59m
Mon 12/146:15 pm -
1 stop9h 46m
Deal found 11/11![Frontier logo]()
$301
This Trip.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/36:21 am -
1 stop13h 40m
Sun 12/66:15 pm -
1 stop9h 46m
Deal found 11/9![Frontier logo]()
$320
This Priceline deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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.
Fri 12/116:21 am -
1 stop11h 59m
Sun 12/136:15 pm -
1 stop9h 46m
Deal found 11/8![Frontier logo]()
$330
This Expedia deal was found by Cheapflights users on 11/11. 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 12/26:00 am -
1 stop7h 21m
Mon 12/76:15 pm -
1 stop9h 46m
Deal found 11/11![Multiple Airlines logo]()
$334
This Priceline deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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.
Mon 12/76:00 am -
1 stop9h 19m
Fri 12/116:15 pm -
1 stop9h 46m
Deal found 11/9![Multiple Airlines logo]()
$345
This Alaska Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/53:19 pm -
1 stop9h 40m
Tue 12/86:37 am -
1 stop8h 54m
Deal found 11/9![Alaska Airlines logo]()
$347
This Cheapflightsfares deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” 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.
Thu 12/106:21 am -
1 stop11h 59m
Sun 12/136:15 pm -
1 stop9h 46m
Deal found 11/7![Frontier logo]()
$348
This Trip.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/36:21 am -
1 stop13h 40m
Wed 12/98:02 am -
1 stop8h 47m
Deal found 11/8![Multiple Airlines logo]()
$349
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/157:00 am -
1 stop7h 37m
Tue 12/224:20 pm -
1 stop5h 22m
Deal found 11/8![United Airlines logo]()
$371
This Delta deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/26:00 am -
1 stop8h 44m
Wed 12/95:15 am -
1 stop5h 44m
Deal found 11/8![Delta logo]()
$387
This Delta deal was found by Cheapflights users on 11/11. 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.
Sat 12/512:39 pm -
1 stop8h 45m
Sat 12/122:29 pm -
1 stop7h 25m
Deal found 11/11![Delta logo]()
$397
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 November 13, 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 November 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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.
Sun 1/249:26 pm -
1 stop22h 32m
Mon 2/17:18 pm -
1 stop17h 42m
Deal found 11/9![Multiple Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/157:00 am -
1 stop7h 37m
Tue 12/224:20 pm -
1 stop5h 22m
Deal found 11/8![United Airlines logo]()
$371
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 1/207:15 am -
1 stop6h 09m
Tue 1/265:25 am -
1 stop7h 54m
Deal found 11/9![Delta logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 11/12. 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.
Tue 12/152:13 pm -
1 stop9h 14m
Tue 12/298:46 pm -
1 stop7h 54m
Deal found 11/12![Alaska Airlines logo]()
$383
This Southwest deal was found by Cheapflights users on 11/10. 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.
Thu 12/38:05 am -
1 stop8h 05m
Sun 12/610:15 am -
1 stop6h 35m
Deal found 11/10![Southwest logo]()
$409
This American Airlines deal was found by Cheapflights users on 11/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/289:40 am -
Nonstop4h 25m
Sun 1/3112:36 pm -
Nonstop3h 44m
Deal found 11/10![American Airlines logo]()
$473
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/226:50 am -
1 stop7h 38m
Tue 12/292:37 pm -
1 stop5h 53m
Deal found 11/8![United Airlines logo]()
$371
This Delta deal was found by Cheapflights users on 11/11. 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.
Sat 12/512:39 pm -
1 stop8h 45m
Sat 12/122:29 pm -
1 stop7h 25m
Deal found 11/11![Delta logo]()
$397
This Alaska Airlines deal was found by Cheapflights users on 11/12. 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.
Thu 12/179:01 am -
1 stop7h 26m
Wed 12/308:46 pm -
1 stop7h 54m
Deal found 11/12![Alaska Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” 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 12/108:05 am -
1 stop8h 05m
Thu 12/316:20 am -
1 stop6h 55m
Deal found 11/7![Southwest logo]()
$423
This United Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/157:52 pm -
Nonstop4h 07m
Sat 12/195:25 pm -
1 stop6h 05m
Deal found 11/9![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 1/194:00 pm -
1 stop7h 42m
Fri 1/225:25 am -
1 stop5h 50m
Deal found 11/11![Delta logo]()
$401
This Delta deal was found by Cheapflights users on 11/11. 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.
Sun 1/177:15 am -
1 stop6h 09m
Sat 1/231:10 pm -
1 stop7h 58m
Deal found 11/11![Delta logo]()
$401
This American Airlines deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” 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 1/159:40 am -
Nonstop4h 25m
Mon 1/1812:36 pm -
Nonstop3h 44m
Deal found 11/7![American Airlines logo]()
$496
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/216:50 am -
1 stop7h 38m
Mon 12/282:37 pm -
1 stop7h 05m
Deal found 11/8![United Airlines logo]()
$431
This Delta deal was found by Cheapflights users on 11/11. 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.
Sat 12/56:49 am -
1 stop7h 28m
Sat 12/121:07 pm -
2 stops7h 28m
Deal found 11/11![Delta logo]()
$402
This United Airlines deal was found by Cheapflights users on 11/10. 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.
Thu 1/218:29 am -
Nonstop4h 26m
Sun 1/248:15 am -
Nonstop3h 51m
Deal found 11/10![United Airlines logo]()
$432
This Alaska Airlines deal was found by Cheapflights users on 11/12. 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.
Thu 2/48:00 am -
1 stop12h 17m
Sun 2/77:59 pm -
1 stop27h 00m
Deal found 11/12![Alaska Airlines logo]()
$532
This Delta deal was found by Cheapflights users on 11/10. 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 12/85:30 am -
1 stop9h 14m
Thu 12/106:00 am -
2 stops9h 43m
Deal found 11/10![Delta logo]()
$408
This American Airlines deal was found by Cheapflights users on 11/11. 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 12/36:00 am -
1 stop7h 59m
Tue 12/82:11 pm -
2 stops9h 11m
Deal found 11/11![American Airlines logo]()
$588
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Thu 12/247:54 pm -
Nonstop4h 21m
Tue 12/298:05 am -
Nonstop3h 48m
Deal found 11/11![United Airlines logo]()
$443
This Delta deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/106:00 am -
1 stop8h 44m
Mon 12/141:47 pm -
1 stop8h 07m
Deal found 11/8![Delta logo]()
$409
This Delta deal was found by Cheapflights users on 11/11. 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.
Tue 1/1911:20 am -
2 stops12h 22m
Sun 1/246:59 pm -
2 stops14h 11m
Deal found 11/11![Delta logo]()
$411
This United Airlines deal was found by Cheapflights users on 11/11. 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.
Sat 1/238:40 am -
1 stop5h 48m
Wed 1/272:30 pm -
1 stop5h 29m
Deal found 11/11![United Airlines logo]()
$469
This Priceline deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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.
Fri 11/2011:25 am -
2 stops9h 44m
Sun 11/229:47 pm -
2 stops12h 08m
Deal found 11/8![Alaska Airlines logo]()
$629
This American Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 11/205:46 am -
1 stop7h 52m
Sun 11/222:42 pm -
1 stop7h 39m
Deal found 11/8![American Airlines logo]()
$650
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 1/2011:20 am -
2 stops12h 22m
Mon 1/251:10 pm -
2 stops9h 47m
Deal found 11/9![Delta logo]()
$411
This United Airlines deal was found by Cheapflights users on 11/10. 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.
Fri 1/298:45 am -
Nonstop4h 23m
Mon 2/112:49 pm -
Nonstop3h 40m
Deal found 11/10![United Airlines logo]()
$473
This Delta deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” 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 1/89:56 am -
2 stops11h 37m
Sun 1/102:21 pm -
1 stop6h 56m
Deal found 11/7![Delta logo]()
$414
This American Airlines deal was found by Cheapflights users on 11/11. 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.
Sun 12/204:16 pm -
1 stop6h 40m
Thu 12/316:00 am -
1 stop8h 49m
Deal found 11/11![American Airlines logo]()
$695
Last-minute flights from Illinois to IdahoDiscover last-minute flight deals from Illinois to Idaho. Data last updated November 13, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Idaho. Data last updated November 13, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 11/11. 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 12/26:00 am -
1 stop7h 21m
Mon 12/76:15 pm -
1 stop9h 46m
Deal found 11/11![Multiple Airlines logo]()
$334
This Delta deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/26:00 am -
1 stop8h 44m
Wed 12/95:15 am -
1 stop5h 44m
Deal found 11/8![Delta logo]()
$387
This Cheapflightsfares deal was found by Cheapflights users on 11/12. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:21 am -
1 stop13h 40m
Mon 12/76:15 pm -
1 stop9h 46m
Deal found 11/12![Frontier logo]()
$288
This Trip.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/36:21 am -
1 stop13h 40m
Sun 12/66:15 pm -
1 stop9h 46m
Deal found 11/9![Frontier logo]()
$320
This Trip.com deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/36:21 am -
1 stop13h 40m
Wed 12/98:02 am -
1 stop8h 47m
Deal found 11/8![Multiple Airlines logo]()
$349
This Alaska Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/53:19 pm -
1 stop9h 40m
Tue 12/86:37 am -
1 stop8h 54m
Deal found 11/9![Alaska Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 11/11. 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.
Sat 12/512:39 pm -
1 stop8h 45m
Sat 12/122:29 pm -
1 stop7h 25m
Deal found 11/11![Delta logo]()
$397
This Priceline deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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.
Mon 12/76:00 am -
1 stop9h 19m
Fri 12/116:15 pm -
1 stop9h 46m
Deal found 11/9![Multiple Airlines logo]()
$345
This Cheapflightsfares deal was found by Cheapflights users on 11/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:21 am -
1 stop11h 59m
Mon 12/146:15 pm -
1 stop9h 46m
Deal found 11/11![Frontier logo]()
$301
This Cheapflightsfares deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” 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.
Thu 12/106:21 am -
1 stop11h 59m
Sun 12/136:15 pm -
1 stop9h 46m
Deal found 11/7![Frontier logo]()
$348
This Priceline deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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.
Fri 12/116:21 am -
1 stop11h 59m
Sun 12/136:15 pm -
1 stop9h 46m
Deal found 11/8![Frontier logo]()
$330
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/157:00 am -
1 stop7h 37m
Tue 12/224:20 pm -
1 stop5h 22m
Deal found 11/8![United Airlines logo]()
$371
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 November 13, 2026.
Search for one-way flight options from Illinois to Idaho. Find affordable one-way fares based on user searches. Data last updated November 13, 2026.
This Alaska Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/228:59 pm -
1 stop13h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Alaska Airlines logo]()
$179
This Priceline deal was found by Cheapflights users on 11/12. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/52:08 pm -
1 stop7h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/12![Alaska Airlines logo]()
$184
This Alaska Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/256:00 am -
1 stop7h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Alaska Airlines logo]()
$185
This United Airlines deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” 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 12/226:50 am -
1 stop7h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/8![United Airlines logo]()
$186
This Travelocity deal was found by Cheapflights users on 11/11. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/218:59 pm -
1 stop13h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/11![Alaska Airlines logo]()
$190
This American Airlines deal was found by Cheapflights users on 11/12. 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 1/121:44 pm -
2 stops10h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/12![American Airlines logo]()
$191
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/196:30 pm -
1 stop6h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Delta logo]()
$194
This Priceline deal was found by Cheapflights users on 11/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/269:00 am -
1 stop10h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/10![Alaska Airlines logo]()
$195
This Delta deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/246:30 pm -
1 stop6h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Delta logo]()
$205
This Frontier deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 12/217:35 am -
1 stop10h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Frontier logo]()
$205
This United Airlines deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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 1/258:45 am -
Nonstop4h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![United Airlines logo]()
$205
This Frontier deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” 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.
Wed 12/237:35 am -
1 stop10h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/9![Frontier logo]()
$206
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 November 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $288 (Cheapflightsfares) |
One-way from | $179 (Alaska Airlines) |
Popular in | June |
Cheapest in | February |
Average price | $403 |
Good round-trip deal | $440 or less |
Good one-way deal | $244 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 November 13, 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
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
Tue 12/22
6:50 am-1:28 pm
1 stop7h 38m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$186
ChicagoIdaho Falls
ORD Chicago O'Hare Intl - IDA Idaho Falls Fanning Field
ORDIDA
Chicago O'Hare Intl
Tue 1/12
7:00 am-1:12 pm
1 stop7h 12m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$186
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Wed 12/23
7:35 am-4:48 pm
1 stop10h 13m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$190
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Thu 12/24
6:30 pm-11:59 pm
1 stop6h 29m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$205
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Thu 12/31
1:20 pm-11:15 pm
2 stops10h 55m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$210
ChicagoHailey
ORD Chicago O'Hare Intl - SUN Hailey Sun Valley-Friedman
ORDSUN
Chicago O'Hare Intl
Mon 1/25
3:43 pm-9:36 pm
1 stop6h 53m
Hailey Sun Valley-Friedman
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$215
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Wed 12/23
10:55 pm-12:05 pm
1 stop14h 10m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$223
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Wed 12/30
10:55 pm-12:05 pm
1 stop14h 10m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$223
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Mon 12/21
5:15 pm-1:35 am
1 stop9h 20m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$235
ChicagoHailey
ORD Chicago O'Hare Intl - SUN Hailey Sun Valley-Friedman
ORDSUN
Chicago O'Hare Intl
Fri 12/25
8:45 am-12:08 pm
Nonstop4h 23m
Hailey Sun Valley-Friedman
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$237
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
ORD-SUN
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
ORD-SUN
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 $529). 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 November 13, 2026.
It’s typically best to fly out from Illinois to Idaho at noon. Doing so could potentially save you 29% 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 November 13, 2026.
The most flights from USIL to USID are scheduled on a Monday (8 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (3 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 $379 and $561 in December.The cheapest round-trip price found within the last 5 days was $288 on Frontier (Dec 3-Dec 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 November 13, 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.
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Related info for your journey
Find useful and relevant information for your journey from Illinois to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Return Flight Options
Top destinations
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 November 13, 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 November 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$386 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$274 | Average$511 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$292 | Average$473 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$321 | Average$537 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$382 | FlexibilityNo cancel fee | On-time75% |