$112+ Cheap flights from Illinois to Boise (BOI)
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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Oct 30 — Nov 61
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 September 30, 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 September 30, 2026.
This Expedia deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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.
Tue 10/273:49 pm -
1 stop9h 10m
Thu 10/292:49 pm -
1 stop13h 24m
Deal found 9/28![Multiple Airlines logo]()
$304
This Orbitz deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 12/228:59 pm -
1 stop13h 45m
Tue 12/296:56 pm -
1 stop9h 10m
Deal found 9/28![Multiple Airlines logo]()
$319
This Cheapflightsfares deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/223:30 pm -
1 stop23h 25m
Mon 10/262:50 pm -
1 stop13h 26m
Deal found 9/29![Frontier logo]()
$320
This Alaska Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 12/52:08 pm -
1 stop7h 02m
Thu 12/102:05 pm -
1 stop8h 54m
Deal found 9/30![Alaska Airlines logo]()
$323
This Alaska Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:35 pm -
1 stop15h 32m
Mon 11/96:43 pm -
1 stop17h 34m
Deal found 9/30![Alaska Airlines logo]()
$331
This Alaska Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” 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 12/106:47 pm -
1 stop15h 43m
Mon 12/144:47 pm -
1 stop19h 28m
Deal found 9/25![Alaska Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/248:40 am -
Nonstop3h 48m
Sat 10/3112:31 pm -
Nonstop3h 34m
Deal found 9/29![United Airlines logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:21 am -
1 stop15h 35m
Mon 12/149:51 pm -
2 stops26h 03m
Deal found 9/29![Frontier logo]()
$345
This American Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 11/46:00 am -
1 stop8h 51m
Wed 11/111:24 pm -
Nonstop3h 46m
Deal found 9/30![American Airlines logo]()
$353
This American Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2411:35 am -
Nonstop3h 58m
Sat 10/3112:14 pm -
1 stop7h 24m
Deal found 9/28![American Airlines logo]()
$355
This Kiwi.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/2112:37 pm -
2 stops26h 18m
Thu 11/52:49 pm -
1 stop13h 24m
Deal found 9/29![Frontier logo]()
$357
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/246:00 am -
1 stop8h 34m
Sun 11/811:10 pm -
1 stop10h 09m
Deal found 9/30![Delta logo]()
$359
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 September 30, 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 September 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/62:15 pm -
1 stop9h 24m
Mon 11/96:43 pm -
1 stop17h 34m
Deal found 9/29![Alaska Airlines logo]()
$331
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/45:31 pm -
1 stop5h 54m
Wed 11/115:30 am -
1 stop5h 20m
Deal found 9/30![Delta logo]()
$363
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 10/246:35 am -
2 stops10h 40m
Sat 10/316:00 am -
2 stops8h 25m
Deal found 9/28![Southwest logo]()
$373
This United Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/138:40 am -
Nonstop3h 48m
Tue 10/202:44 pm -
1 stop8h 15m
Deal found 9/26![United Airlines logo]()
$391
This American Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/205:19 pm -
1 stop8h 13m
Tue 1/56:30 am -
1 stop7h 51m
Deal found 9/29![American Airlines logo]()
$491
This Alaska Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” 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 12/106:47 pm -
1 stop15h 43m
Mon 12/144:47 pm -
1 stop19h 28m
Deal found 9/25![Alaska Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” 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 12/1012:58 pm -
1 stop6h 40m
Mon 12/1410:37 am -
2 stops10h 19m
Deal found 9/25![Delta logo]()
$368
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 11/57:00 am -
1 stop8h 27m
Mon 11/96:43 pm -
1 stop17h 34m
Deal found 9/29![Alaska Airlines logo]()
$343
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” 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 10/2210:55 pm -
1 stop13h 25m
Mon 10/266:50 pm -
2 stops9h 55m
Deal found 9/25![Southwest logo]()
$382
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/44:00 pm -
1 stop7h 08m
Wed 11/1112:13 pm -
2 stops8h 20m
Deal found 9/26![Delta logo]()
$368
This Alaska Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” 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 10/137:00 am -
1 stop9h 23m
Tue 10/202:06 pm -
1 stop14h 34m
Deal found 9/26![Alaska Airlines logo]()
$361
This Delta deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 10/225:30 pm -
1 stop7h 29m
Wed 10/288:59 am -
2 stops12h 06m
Deal found 9/28![Delta logo]()
$368
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 11/185:20 am -
1 stop7h 45m
Mon 11/308:45 pm -
1 stop7h 15m
Deal found 9/28![Southwest logo]()
$414
This United Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/95:00 am -
1 stop7h 55m
Wed 1/132:45 pm -
1 stop5h 02m
Deal found 9/28![United Airlines logo]()
$469
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:20 am -
2 stops11h 54m
Mon 11/91:41 pm -
1 stop9h 13m
Deal found 9/30![Delta logo]()
$368
This Southwest deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/216:50 pm -
1 stop7h 15m
Mon 12/288:45 pm -
1 stop7h 15m
Deal found 9/25![Southwest logo]()
$452
This Alaska Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:35 pm -
1 stop15h 32m
Tue 11/178:09 am -
2 stops9h 50m
Deal found 9/28![Alaska Airlines logo]()
$416
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1810:34 am -
2 stops12h 52m
Mon 11/3011:10 pm -
2 stops9h 27m
Deal found 9/26![Delta logo]()
$401
This American Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” 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 11/204:07 pm -
1 stop8h 42m
Mon 11/232:03 pm -
2 stops9h 04m
Deal found 9/26![American Airlines logo]()
$620
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” 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 10/132:50 pm -
2 stops8h 30m
Tue 10/2012:55 pm -
2 stops8h 05m
Deal found 9/26![Southwest logo]()
$472
This United Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/196:25 am -
2 stops8h 20m
Sun 11/225:00 am -
2 stops7h 53m
Deal found 9/29![United Airlines logo]()
$575
This Delta deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/610:12 am -
2 stops8h 47m
Mon 11/96:40 am -
2 stops8h 59m
Deal found 9/25![Delta logo]()
$422
This American Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:00 am -
1 stop7h 51m
Thu 10/223:24 pm -
1 stop7h 47m
Deal found 9/29![American Airlines logo]()
$677
This United Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:00 am -
1 stop7h 31m
Fri 11/202:51 pm -
1 stop5h 21m
Deal found 9/30![United Airlines logo]()
$628
This United Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/192:28 pm -
2 stops10h 31m
Mon 11/912:31 pm -
1 stop7h 51m
Deal found 9/30![United Airlines logo]()
$650
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/196:01 am -
1 stop8h 38m
Tue 11/241:41 pm -
1 stop7h 50m
Deal found 9/29![Delta logo]()
$499
This American Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/266:03 am -
1 stop8h 49m
Sat 11/286:44 am -
1 stop7h 53m
Deal found 9/28![American Airlines logo]()
$804
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” 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 11/2412:30 pm -
2 stops10h 56m
Tue 12/15:15 am -
1 stop5h 44m
Deal found 9/26![Delta logo]()
$504
This Delta deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 2/186:01 am -
1 stop7h 38m
Sun 2/211:43 pm -
1 stop7h 40m
Deal found 9/28![Delta logo]()
$549
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/2011:21 am -
2 stops11h 45m
Thu 10/228:22 pm -
2 stops13h 29m
Deal found 9/29![Alaska Airlines logo]()
$859
Last-minute flights from Illinois to BoiseDiscover last-minute flight deals from Illinois to Boise. Data last updated September 30, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Boise. Data last updated September 30, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” 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 10/137:00 am -
1 stop9h 23m
Tue 10/202:06 pm -
1 stop14h 34m
Deal found 9/26![Alaska Airlines logo]()
$361
This Kiwi.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/2112:37 pm -
2 stops26h 18m
Thu 11/52:49 pm -
1 stop13h 24m
Deal found 9/29![Frontier logo]()
$357
This Cheapflightsfares deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/223:30 pm -
1 stop23h 25m
Mon 10/262:50 pm -
1 stop13h 26m
Deal found 9/29![Frontier logo]()
$320
This Alaska Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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 10/223:49 pm -
1 stop9h 10m
Wed 10/282:06 pm -
1 stop14h 34m
Deal found 9/28![Alaska Airlines logo]()
$323
This United Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/228:40 am -
Nonstop3h 48m
Mon 10/262:51 pm -
1 stop5h 39m
Deal found 9/29![United Airlines logo]()
$353
This United Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/248:40 am -
Nonstop3h 48m
Sat 10/3112:31 pm -
Nonstop3h 34m
Deal found 9/29![United Airlines logo]()
$343
This American Airlines deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2411:35 am -
Nonstop3h 58m
Sat 10/3112:14 pm -
1 stop7h 24m
Deal found 9/28![American Airlines logo]()
$355
This Delta deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/246:00 am -
1 stop8h 34m
Sun 11/811:10 pm -
1 stop10h 09m
Deal found 9/30![Delta logo]()
$359
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/2412:00 pm -
1 stop7h 33m
Tue 11/101:19 pm -
1 stop7h 28m
Deal found 9/29![Delta logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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.
Sun 10/256:00 am -
1 stop7h 35m
Tue 10/272:06 pm -
1 stop14h 34m
Deal found 9/29![Alaska Airlines logo]()
$351
This Expedia deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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.
Tue 10/273:49 pm -
1 stop9h 10m
Thu 10/292:49 pm -
1 stop13h 24m
Deal found 9/28![Multiple Airlines logo]()
$304
This Delta deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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 10/276:04 am -
1 stop8h 30m
Sat 11/71:40 pm -
1 stop7h 53m
Deal found 9/29![Delta logo]()
$363
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 September 30, 2026.
Search for one-way flight options from Illinois to Boise. Find affordable one-way fares based on user searches. Data last updated September 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/29. Clicking the “Pick Dates” 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
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/277:50 pm -
2 stops43h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$137
This Frontier deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” 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 12/236:11 am -
1 stop12h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$138
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:21 am -
1 stop15h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/286:16 am -
2 stops32h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 10/275:46 pm -
1 stop7h 13m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Alaska Airlines logo]()
$162
This Cheapflightsfares deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” 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.
Tue 11/245:19 am -
1 stop14h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$163
This Frontier deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” 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 12/286:11 am -
1 stop12h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Frontier logo]()
$165
This CheapOair deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” 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.
Mon 12/146:21 am -
1 stop15h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” 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 10/233:49 pm -
1 stop9h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Alaska Airlines logo]()
$170
This United Airlines deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/298:40 am -
Nonstop3h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![United Airlines logo]()
$172
This Southwest deal was found by Cheapflights users on 9/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:40 am -
1 stop6h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Southwest logo]()
$177
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 September 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $299 (Orbitz) |
One-way from | $112 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $427 |
Good round-trip deal | $359 or less |
Good one-way deal | $258 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 7,457,451 searches. Data last updated September 30, 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
Quickest round-trip
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 11/14
8:40 am-11:31 am
Nonstop3h 51m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$172
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sat 10/31
6:04 am-1:34 pm
1 stop8h 30m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 12/24
2:08 pm-8:12 pm
1 stop7h 04m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Thu 11/26
6:00 am-1:11 pm
1 stop8h 11m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 10/24
7:00 am-2:11 pm
1 stop8h 11m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Wed 10/28
6:04 am-1:34 pm
1 stop8h 30m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 11/26
12:58 pm-6:39 pm
1 stop6h 41m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$182
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 10/29
6:20 am-3:20 pm
2 stops10h 00m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$187
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Sat 10/24
9:59 am-6:46 pm
2 stops9h 47m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$187
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Fri 12/25
6:00 am-12:23 pm
1 stop7h 23m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$190
Showing 1-10 of 54 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
MLI-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
MLI-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 $325). Flying from Illinois to Boise in December is currently the most expensive (average of $554). 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 September 30, 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 11% 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 September 30, 2026.
The most flights from USIL to BOI are scheduled on a Monday (8 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (7 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 $353 and $481 in December.The cheapest round-trip price found within the last 5 days was $299 on Multiple Airlines (Dec 14-Dec 21).
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
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Boise flight routes
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Alternative routes for Illinois to Boise
See prices for flight routes from nearby airports that may be better suited for you.
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 September 30, 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 September 30, 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 7,457,451 searches. Data last updated September 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$272 | Average$549 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$288 | Average$458 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$292 | Average$461 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$348 | Average$372 | FlexibilityNo cancel fee | On-time75% |