$184+ 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BOI
Dec 15 — Dec 221
Round-trip
1 adult, Economy
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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 November 15, 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 November 15, 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 11/13. 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 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 11/13![Frontier logo]()
$298
This Cheapflightsfares deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 11/14![Frontier logo]()
$313
This Expedia deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:21 am -
1 stop11h 59m
Mon 12/146:15 pm -
1 stop9h 46m
Deal found 11/14![Frontier logo]()
$315
This Expedia deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/146:21 am -
1 stop11h 59m
Mon 12/215:33 pm -
1 stop11h 16m
Deal found 11/14![Frontier logo]()
$323
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 Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:21 am -
1 stop13h 40m
Sat 12/56:37 am -
1 stop6h 44m
Deal found 11/12![Multiple Airlines logo]()
$344
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/87:27 am -
1 stop16h 00m
Wed 12/98:02 am -
1 stop8h 47m
Deal found 11/11![Alaska Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Thu 12/108:53 am -
1 stop5h 46m
Mon 12/142:48 pm -
1 stop5h 14m
Deal found 11/13![United Airlines logo]()
$379
This American Airlines deal was found by Cheapflights users on 11/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:00 am -
1 stop7h 59m
Mon 12/142:11 pm -
2 stops8h 09m
Deal found 11/13![American Airlines logo]()
$384
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 Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/912:00 pm -
1 stop7h 00m
Mon 12/143:30 pm -
1 stop5h 00m
Deal found 11/11![Southwest logo]()
$403
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 November 15, 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 November 15, 2026.
This Alaska Airlines deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/93:19 pm -
1 stop9h 40m
Mon 12/148:02 am -
1 stop7h 29m
Deal found 11/14![Alaska Airlines logo]()
$368
This United Airlines deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/710:40 am -
2 stops11h 55m
Mon 1/112:35 pm -
1 stop5h 35m
Deal found 11/14![United Airlines logo]()
$384
This Delta deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1711:08 am -
2 stops14h 02m
Thu 12/241:51 pm -
1 stop7h 46m
Deal found 11/14![Delta logo]()
$384
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/72:05 pm -
2 stops9h 10m
Mon 1/118:20 am -
2 stops8h 20m
Deal found 11/12![Southwest logo]()
$429
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 Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/218:59 pm -
1 stop13h 45m
Fri 12/255:00 pm -
1 stop11h 40m
Deal found 11/10![Alaska Airlines logo]()
$369
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 1/196:00 am -
1 stop8h 26m
Sat 1/231:12 pm -
2 stops9h 43m
Deal found 11/10![Delta logo]()
$402
This United Airlines deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/117:30 am -
1 stop8h 37m
Sun 2/148:20 am -
Nonstop3h 44m
Deal found 11/14![United Airlines logo]()
$418
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 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/125:05 am -
1 stop7h 00m
Sat 12/198:50 pm -
1 stop12h 55m
Deal found 11/14![Southwest logo]()
$433
This Delta deal was found by Cheapflights users on 11/13. 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 1/197:15 am -
1 stop6h 02m
Tue 1/2610:33 am -
2 stops10h 35m
Deal found 11/13![Delta logo]()
$402
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 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 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.
Mon 12/212:00 pm -
2 stops8h 40m
Mon 12/2810:20 pm -
1 stop6h 25m
Deal found 11/10![Southwest logo]()
$469
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.
Sat 2/65:41 pm -
1 stop6h 34m
Tue 2/92:35 pm -
1 stop5h 35m
Deal found 11/10![United Airlines logo]()
$479
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.
Thu 2/1112:42 pm -
1 stop8h 55m
Sun 2/142:30 pm -
1 stop7h 15m
Deal found 11/11![Delta logo]()
$409
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 12/36:30 am -
2 stops11h 20m
Tue 12/811:49 am -
1 stop8h 11m
Deal found 11/11![United Airlines logo]()
$484
This Delta deal was found by Cheapflights users on 11/13. 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.
Fri 11/276:00 am -
1 stop8h 11m
Sat 12/52:29 pm -
1 stop7h 32m
Deal found 11/13![Delta logo]()
$414
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.
Thu 1/217:15 am -
1 stop6h 02m
Sun 1/248:44 am -
2 stops12h 24m
Deal found 11/10![Delta logo]()
$414
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/175:30 pm -
1 stop7h 40m
Thu 12/311:51 pm -
1 stop7h 31m
Deal found 11/12![Delta logo]()
$419
This Expedia deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1710:51 am -
2 stops13h 00m
Thu 12/248:46 pm -
2 stops12h 29m
Deal found 11/14![Alaska Airlines logo]()
$579
This United Airlines deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/177:52 am -
1 stop6h 35m
Thu 12/242:43 pm -
1 stop5h 08m
Deal found 11/14![United Airlines logo]()
$591
This Delta deal was found by Cheapflights users on 11/13. 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.
Thu 12/317:10 am -
1 stop6h 00m
Mon 1/41:50 pm -
1 stop9h 08m
Deal found 11/13![Delta logo]()
$419
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/186:40 am -
1 stop10h 24m
Mon 12/2811:10 pm -
1 stop8h 45m
Deal found 11/12![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 11/13. 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 12/12:31 pm -
1 stop9h 28m
Sun 12/62:48 pm -
1 stop5h 14m
Deal found 11/13![United Airlines logo]()
$678
This Delta deal was found by Cheapflights users on 11/13. 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.
Fri 12/116:10 am -
1 stop8h 34m
Mon 12/141:47 pm -
1 stop8h 14m
Deal found 11/13![Delta logo]()
$424
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/136:20 am -
2 stops10h 44m
Thu 12/176:00 am -
2 stops11h 26m
Deal found 11/12![Delta logo]()
$429
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1211:21 am -
2 stops12h 04m
Tue 3/165:53 am -
2 stops10h 40m
Deal found 11/11![Alaska Airlines logo]()
$777
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 3/132:26 pm -
1 stop9h 50m
Tue 3/168:52 pm -
2 stops13h 52m
Deal found 11/11![United Airlines logo]()
$741
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 11/245:29 pm -
1 stop7h 30m
Tue 12/15:15 am -
2 stops11h 46m
Deal found 11/10![Delta logo]()
$438
Last-minute flights from Illinois to BoiseDiscover last-minute flight deals from Illinois to Boise. Data last updated November 15, 2026 and is based on user searches.
Discover last-minute flight deals from Illinois to Boise. Data last updated November 15, 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 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 Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:21 am -
1 stop13h 40m
Sat 12/56:37 am -
1 stop6h 44m
Deal found 11/12![Multiple Airlines logo]()
$344
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 11/11. 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.
Tue 12/87:27 am -
1 stop16h 00m
Wed 12/98:02 am -
1 stop8h 47m
Deal found 11/11![Alaska Airlines logo]()
$357
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/912:00 pm -
1 stop7h 00m
Mon 12/143:30 pm -
1 stop5h 00m
Deal found 11/11![Southwest logo]()
$403
This Cheapflightsfares deal was found by Cheapflights users on 11/13. 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 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 11/13![Frontier logo]()
$298
This Cheapflightsfares deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 11/14![Frontier logo]()
$313
This United Airlines deal was found by Cheapflights users on 11/13. 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.
Thu 12/108:53 am -
1 stop5h 46m
Mon 12/142:48 pm -
1 stop5h 14m
Deal found 11/13![United Airlines logo]()
$379
This American Airlines deal was found by Cheapflights users on 11/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:00 am -
1 stop7h 59m
Mon 12/142:11 pm -
2 stops8h 09m
Deal found 11/13![American Airlines logo]()
$384
This Expedia deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:21 am -
1 stop11h 59m
Mon 12/146:15 pm -
1 stop9h 46m
Deal found 11/14![Frontier logo]()
$315
This Expedia deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/146:21 am -
1 stop11h 59m
Mon 12/215:33 pm -
1 stop11h 16m
Deal found 11/14![Frontier logo]()
$323
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 November 15, 2026.
Search for one-way flight options from Illinois to Boise. Find affordable one-way fares based on user searches. Data last updated November 15, 2026.
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 Priceline deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/126:00 am -
1 stop9h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/14![Alaska Airlines logo]()
$190
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 Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/166:05 am -
1 stop5h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/12![Southwest logo]()
$199
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.
Thu 12/316:30 pm -
1 stop6h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/11![Delta logo]()
$205
This Jetabroad deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/225:15 am -
1 stop14h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/14![Frontier logo]()
$206
This Cheapflightsfares deal was found by Cheapflights users on 11/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/255:15 am -
1 stop14h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/13![Frontier logo]()
$209
This Delta deal was found by Cheapflights users on 11/13. 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.
Sun 12/135:30 pm -
1 stop7h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/13![Delta logo]()
$210
This Delta deal was found by Cheapflights users on 11/13. 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.
Fri 12/185:55 pm -
1 stop6h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/13![Delta logo]()
$210
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/246:00 am -
1 stop8h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/11![Delta logo]()
$218
This Delta deal was found by Cheapflights users on 11/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/196:30 pm -
1 stop6h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/14![Delta logo]()
$219
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 11/2612:45 pm -
1 stop6h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/10![Southwest logo]()
$235
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 November 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $288 (Cheapflightsfares) |
One-way from | $184 (Priceline) |
Popular in | June |
Cheapest in | February |
Average price | $403 |
Good round-trip deal | $520 or less |
Good one-way deal | $257 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 November 15, 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
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Wed 11/25
5:15 am-7:00 pm
1 stop14h 45m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$209
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
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sun 12/13
5:30 pm-12:10 am
1 stop7h 40m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$210
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Fri 12/18
5:55 pm-11:52 pm
1 stop6h 57m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$210
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sat 12/19
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
$219
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Thu 11/26
9:20 am-5:25 pm
2 stops9h 05m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$240
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Thu 11/26
6:23 am-5:00 pm
2 stops11h 37m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$240
ChicagoBoise
ORD Chicago O'Hare Intl - BOI Boise Air Term. Gowen Fld
ORDBOI
Chicago O'Hare Intl
Mon 11/30
5:42 pm-11:59 pm
1 stop7h 17m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$240
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Sat 12/19
5:30 pm-1:40 am
2 stops9h 10m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$244
ChicagoBoise
MDW Chicago Midway - BOI Boise Air Term. Gowen Fld
MDWBOI
Chicago Midway
Fri 12/18
10:55 pm-9:50 am
1 stop11h 55m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$244
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
PIA-BOI
MLI-BOI
MDW-BOI
SPI-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
PIA-BOI
MLI-BOI
MDW-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 $327). Flying from Illinois to Boise in December is currently the most expensive (average of $579). 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 November 15, 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 afternoon tend to be the most expensive. A flight at noon could potentially save you up to 38% 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 November 15, 2026.
The most flights from USIL to BOI 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 Boise?
Airfare is below average for this route at the moment.
Illinois to Boise flights typically cost between $364 and $455 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 Boise?
The best time to book flights from Illinois to Boise is 90 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
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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 November 15, 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 November 15, 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 November 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$234 | Average$370 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$274 | Average$557 | 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$372 | FlexibilityNo cancel fee | On-time75% |