$78+ Cheap flights from Illinois to Boise (BOI)
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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Sep 12 — Sep 191
Round-trip
1 adult, Economy
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Find cheap flights from Illinois to Boise with Cheapflights
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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 BoiseExplore the most affordable flight options available from Illinois to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2026.
Explore the most affordable flight options available from Illinois to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:21 pm -
1 stop25h 34m
Mon 9/282:50 pm -
1 stop13h 48m
Deal found 8/13![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:21 pm -
1 stop25h 34m
Mon 9/142:50 pm -
1 stop13h 48m
Deal found 8/12![Frontier logo]()
$177
This CheapOair deal was found by Cheapflights users on 8/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:19 pm -
1 stop22h 38m
Mon 10/123:52 pm -
1 stop8h 25m
Deal found 8/12![Frontier logo]()
$182
This CheapOair deal was found by Cheapflights users on 8/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/51:02 pm -
1 stop26h 55m
Mon 11/93:52 pm -
1 stop12h 43m
Deal found 8/11![Frontier logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:32 pm -
1 stop22h 25m
Mon 11/23:52 pm -
1 stop29h 47m
Deal found 8/12![Frontier logo]()
$202
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:50 am -
1 stop9h 07m
Thu 10/293:52 pm -
1 stop12h 43m
Deal found 8/10![Frontier logo]()
$232
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:00 pm -
1 stop7h 57m
Sat 10/35:30 am -
1 stop6h 50m
Deal found 8/12![Delta logo]()
$239
This Delta deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:50 pm -
1 stop6h 50m
Tue 9/291:06 pm -
1 stop7h 49m
Deal found 8/13![Delta logo]()
$239
This Southwest deal was found by Cheapflights users on 8/11. 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.
Sat 9/125:40 am -
1 stop8h 20m
Sat 9/194:05 pm -
2 stops11h 25m
Deal found 8/11![Southwest logo]()
$245
This Delta deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/221:00 pm -
2 stops11h 58m
Tue 9/295:30 am -
2 stops12h 03m
Deal found 8/13![Delta logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am -
1 stop8h 57m
Sun 11/153:52 pm -
1 stop19h 05m
Deal found 8/11![Frontier logo]()
$254
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:05 am -
1 stop5h 55m
Tue 12/151:05 pm -
1 stop5h 30m
Deal found 8/12![Southwest logo]()
$257
Best flights from Illinois to BoiseDiscover carefully curated flight deals from Illinois to Boise that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 13, 2026.
Discover carefully curated flight deals from Illinois to Boise that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 13, 2026.
This CheapOair deal was found by Cheapflights users on 8/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:19 pm -
1 stop22h 38m
Mon 10/123:52 pm -
1 stop8h 25m
Deal found 8/12![Frontier logo]()
$182
This Delta deal was found by Cheapflights users on 8/11. 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 9/266:05 am -
1 stop7h 56m
Sat 10/35:30 am -
1 stop6h 50m
Deal found 8/11![Delta logo]()
$239
This Southwest deal was found by Cheapflights users on 8/11. 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.
Sat 9/125:40 am -
1 stop8h 20m
Sat 9/194:05 pm -
1 stop12h 40m
Deal found 8/11![Southwest logo]()
$245
This Alaska Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/246:29 am -
1 stop7h 06m
Tue 9/296:23 am -
1 stop6h 58m
Deal found 8/11![Alaska Airlines logo]()
$269
This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:00 am -
1 stop5h 34m
Sun 10/1112:26 pm -
Nonstop3h 39m
Deal found 8/12![United Airlines logo]()
$341
This American Airlines deal was found by Cheapflights users on 8/10. 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.
Fri 9/114:43 pm -
1 stop6h 44m
Wed 9/163:21 pm -
1 stop7h 47m
Deal found 8/10![American Airlines logo]()
$436
This Delta deal was found by Cheapflights users on 8/11. 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 9/262:05 pm -
1 stop5h 48m
Sat 10/31:06 pm -
1 stop7h 54m
Deal found 8/11![Delta logo]()
$239
This Southwest deal was found by Cheapflights users on 8/12. 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 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 9/194:05 pm -
2 stops11h 25m
Deal found 8/12![Southwest logo]()
$263
This Delta deal was found by Cheapflights users on 8/11. 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.
Mon 9/285:44 pm -
1 stop7h 14m
Sat 10/38:55 am -
1 stop8h 05m
Deal found 8/11![Delta logo]()
$257
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/224:05 pm -
2 stops7h 25m
Tue 9/293:40 pm -
1 stop6h 00m
Deal found 8/12![Southwest logo]()
$274
This CheapOair deal was found by Cheapflights users on 8/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:17 pm -
1 stop26h 38m
Thu 9/172:50 pm -
1 stop19h 37m
Deal found 8/9![Frontier logo]()
$331
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:05 am -
2 stops9h 15m
Mon 11/212:30 pm -
2 stops8h 50m
Deal found 8/12![Southwest logo]()
$280
This Delta deal was found by Cheapflights users on 8/10. 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.
Thu 9/2412:50 pm -
1 stop6h 49m
Mon 9/2811:10 pm -
2 stops10h 27m
Deal found 8/10![Delta logo]()
$280
This Alaska Airlines deal was found by Cheapflights users on 8/12. 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 10/217:00 am -
1 stop8h 11m
Sat 10/248:25 am -
1 stop8h 55m
Deal found 8/12![Alaska Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/108:00 am -
1 stop9h 42m
Wed 11/116:30 am -
1 stop5h 08m
Deal found 8/11![United Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 8/10. 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 10/1510:55 pm -
1 stop13h 25m
Mon 10/196:50 pm -
2 stops9h 55m
Deal found 8/10![Southwest logo]()
$286
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/316:44 pm -
1 stop6h 15m
Tue 9/16:49 am -
1 stop9h 11m
Deal found 8/12![Delta logo]()
$314
This United Airlines deal was found by Cheapflights users on 8/11. 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.
Fri 9/116:00 am -
1 stop6h 26m
Tue 9/152:41 pm -
1 stop5h 04m
Deal found 8/11![United Airlines logo]()
$384
This American Airlines deal was found by Cheapflights users on 8/11. 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 9/104:43 pm -
1 stop6h 44m
Mon 9/143:21 pm -
1 stop7h 47m
Deal found 8/11![American Airlines logo]()
$436
This Southwest deal was found by Cheapflights users on 8/10. 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.
Fri 9/115:00 pm -
2 stops6h 40m
Fri 9/187:50 pm -
1 stop8h 55m
Deal found 8/10![Southwest logo]()
$319
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/41:50 pm -
1 stop9h 07m
Wed 9/93:28 pm -
1 stop7h 29m
Deal found 8/12![Delta logo]()
$321
This American Airlines deal was found by Cheapflights users on 8/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/216:32 am -
1 stop8h 27m
Fri 8/286:44 am -
1 stop8h 35m
Deal found 8/9![American Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/75:22 pm -
1 stop6h 29m
Tue 11/102:51 pm -
1 stop5h 15m
Deal found 8/12![United Airlines logo]()
$429
This United Airlines deal was found by Cheapflights users on 8/11. 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 10/246:15 am -
1 stop6h 13m
Wed 10/282:51 pm -
1 stop5h 15m
Deal found 8/11![United Airlines logo]()
$429
This Southwest deal was found by Cheapflights users on 8/11. 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.
Fri 9/256:15 pm -
1 stop6h 40m
Fri 10/22:00 pm -
2 stops10h 10m
Deal found 8/11![Southwest logo]()
$355
This Delta deal was found by Cheapflights users on 8/8. 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.
Tue 10/277:35 am -
2 stops10h 39m
Tue 11/31:06 pm -
1 stop7h 54m
Deal found 8/8![Delta logo]()
$370
This United Airlines deal was found by Cheapflights users on 8/10. 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 9/116:00 am -
1 stop6h 26m
Wed 9/167:05 pm -
2 stops13h 52m
Deal found 8/10![United Airlines logo]()
$434
This American Airlines deal was found by Cheapflights users on 8/8. 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.
Tue 8/256:00 am -
1 stop9h 29m
Mon 9/143:21 pm -
1 stop7h 37m
Deal found 8/8![American Airlines logo]()
$537
This Delta deal was found by Cheapflights users on 8/8. 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.
Tue 9/227:00 am -
1 stop9h 16m
Tue 9/2910:34 am -
2 stops10h 21m
Deal found 8/8![Delta logo]()
$370
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:00 am -
2 stops11h 40m
Mon 10/124:45 pm -
1 stop7h 30m
Deal found 8/12![Southwest logo]()
$378
Last-minute flights from Illinois to BoiseDiscover last-minute flight deals from Illinois to Boise. Data last updated August 13, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Boise. Data last updated August 13, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/11. 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 9/87:13 pm -
1 stop5h 46m
Tue 9/152:11 pm -
1 stop7h 33m
Deal found 8/11![Delta logo]()
$264
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:21 pm -
1 stop25h 34m
Mon 9/142:50 pm -
1 stop13h 48m
Deal found 8/12![Frontier logo]()
$177
This American Airlines deal was found by Cheapflights users on 8/12. 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.
Wed 9/911:35 am -
Nonstop3h 56m
Wed 9/163:21 pm -
Nonstop3h 55m
Deal found 8/12![American Airlines logo]()
$263
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/102:50 pm -
1 stop6h 55m
Sat 9/194:05 pm -
1 stop12h 40m
Deal found 8/12![Southwest logo]()
$263
This Southwest deal was found by Cheapflights users on 8/11. 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.
Sat 9/125:40 am -
1 stop8h 20m
Sat 9/194:05 pm -
2 stops11h 25m
Deal found 8/11![Southwest logo]()
$245
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/147:40 pm -
1 stop5h 18m
Wed 9/166:45 am -
2 stops10h 19m
Deal found 8/12![Delta logo]()
$262
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:50 pm -
1 stop6h 50m
Tue 9/291:06 pm -
1 stop7h 49m
Deal found 8/12![Delta logo]()
$239
This Delta deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/221:00 pm -
2 stops11h 58m
Tue 9/295:30 am -
2 stops12h 03m
Deal found 8/13![Delta logo]()
$249
This United Airlines deal was found by Cheapflights users on 8/13. 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.
Tue 9/228:40 am -
Nonstop3h 46m
Tue 9/2912:26 pm -
Nonstop3h 39m
Deal found 8/13![United Airlines logo]()
$257
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/231:21 pm -
1 stop25h 34m
Mon 9/282:50 pm -
1 stop13h 48m
Deal found 8/13![Frontier logo]()
$159
This Delta deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:00 pm -
1 stop7h 57m
Sat 10/35:30 am -
1 stop6h 50m
Deal found 8/13![Delta logo]()
$239
This American Airlines deal was found by Cheapflights users on 8/12. 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.
Sat 9/2611:35 am -
Nonstop3h 56m
Sat 10/33:21 pm -
Nonstop3h 55m
Deal found 8/12![American Airlines logo]()
$258
One-way flights from Illinois to BoiseSearch for one-way flight options from Illinois to Boise. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
Search for one-way flight options from Illinois to Boise. Find affordable one-way fares based on user searches. Data last updated August 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:21 pm -
1 stop25h 34m
Deal found 8/11![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am -
1 stop8h 57m
Deal found 8/13![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/1411:06 am -
2 stops28h 51m
Deal found 8/11![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 8/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:50 am -
1 stop9h 07m
Deal found 8/10![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/137:00 am -
1 stop8h 57m
Deal found 8/11![Frontier logo]()
$117
This Delta deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/105:25 pm -
1 stop7h 31m
Deal found 8/13![Delta logo]()
$120
This Delta deal was found by Cheapflights users on 8/11. 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 9/128:25 am -
1 stop6h 04m
Deal found 8/11![Delta logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/141:02 pm -
2 stops26h 55m
Deal found 8/11![Frontier logo]()
$121
This Delta deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/129:59 am -
2 stops9h 54m
Deal found 8/12![Delta logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:54 pm -
2 stops26h 01m
Deal found 8/12![Frontier logo]()
$127
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1111:40 am -
Nonstop3h 30m
Deal found 8/12![Southwest logo]()
$129
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/208:45 pm -
2 stops15h 35m
Deal found 8/13![Southwest logo]()
$131
Find flight deals from Illinois to Boise
Keep the following information in mind while searching for Illinois to Boise flight deals. Data was last updated August 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $159 (Kiwi.com) |
One-way from | $78 (Kiwi.com) |
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 Boise 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 2,558,603 searches. Data last updated August 13, 2026.
Use the filters below to find and compare flights from Illinois to Boise that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Thu 10/8
5:19 pm-2:57 pm
1 stop22h 38m
Boise Air Term. Gowen Fld
Mon 10/12
3:52 pm-1:17 am
1 stop8h 25m
$182
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sat 9/26
6:05 am-1:01 pm
1 stop7h 56m
Boise Air Term. Gowen Fld
Sat 10/3
5:30 am-1:20 pm
1 stop6h 50m
$239
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 9/26
2:05 pm-6:53 pm
1 stop5h 48m
Boise Air Term. Gowen Fld
Sat 10/3
1:06 pm-10:00 pm
1 stop7h 54m
$239
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sat 9/12
5:40 am-1:00 pm
1 stop8h 20m
Boise Air Term. Gowen Fld
Sat 9/19
4:05 pm-5:45 am
1 stop12h 40m
$245
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Mon 9/28
5:44 pm-11:58 pm
1 stop7h 14m
Boise Air Term. Gowen Fld
Sat 10/3
8:55 am-6:00 pm
1 stop8h 05m
$257
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Thu 9/10
6:15 pm-11:55 pm
1 stop6h 40m
Boise Air Term. Gowen Fld
Sat 9/19
4:05 pm-4:30 am
2 stops11h 25m
$263
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Thu 9/24
6:29 am-12:35 pm
1 stop7h 06m
Boise Air Term. Gowen Fld
Tue 9/29
6:23 am-2:21 pm
1 stop6h 58m
$269
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Tue 9/22
4:05 pm-10:30 pm
2 stops7h 25m
Boise Air Term. Gowen Fld
Tue 9/29
3:40 pm-10:40 pm
1 stop6h 00m
$274
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Thu 10/29
5:05 am-1:20 pm
2 stops9h 15m
Boise Air Term. Gowen Fld
Mon 11/2
12:30 pm-10:20 pm
2 stops8h 50m
$280
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 9/24
12:50 pm-6:39 pm
1 stop6h 49m
Boise Air Term. Gowen Fld
Mon 9/28
11:10 pm-10:37 am
2 stops10h 27m
$280
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Illinois to Boise
Have a flexible travel schedule? Discover the best time to fly to Boise from Illinois with our price prediction graph.
ORD-BOI
STL-BOI
MDW-BOI
PIA-BOI
BMI-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 Boise
USIL-BOI
ORD-BOI
STL-BOI
MDW-BOI
PIA-BOI
What is the cheapest month to book a flight from Illinois to Boise?
Currently, February is the cheapest month in which you can book a flight from Illinois to Boise (average of $323). Flying from Illinois to Boise 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 BOI?
Find hourly flight availability from Illinois to Boise. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 13, 2026.
One of the essential ways to save on airfare from Illinois to Boise is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 21% on airfare.
Weekly flight availability from Illinois to Boise
Explore weekly flight availability from Illinois to Boise. 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 13, 2026.
The most flights from USIL to BOI are scheduled on a Wednesday (8 on average). You will have fewer flight options on Monday, 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 Boise?
Airfare is below average for this route at the moment.
Illinois to Boise flights typically cost between $319 and $437 in September.The cheapest round-trip price found within the last 5 days was $159 on Frontier (Sep 23-Sep 28).
How far ahead should I book a flight from Illinois to Boise?
The best time to book flights from Illinois to Boise 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.
Related info for your journey
Find useful and relevant information for your journey from Illinois to Boise. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Boise?
Book flights to Boise if you plan to visit one of these locationsOntario
Meridian
Nampa
Caldwell
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to Boise
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Other flights to Boise
Explore flights to Boise departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 13, 2026.
Complete your trip
Complete your trip to Boise by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Illinois to Boise by cabin class
Find flights from Illinois to Boise, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Illinois and Boise flights
Browse other Illinois and Boise flight options. Last updated on August 13, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Illinois to Boise flights
Consider these flights traveling from Illinois to Boise.
Top 5 airlines flying from Illinois to Boise
Discover the top 5 airlines that operate flights from Illinois to Boise. 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 2,558,603 searches. Data last updated August 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$472 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$339 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$269 | Average$535 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$288 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$348 | Average$364 | FlexibilityNo cancel fee | On-time75% |