$89+ Cheap flights from Boise (BOI) to Illinois
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Sep 15 — Sep 221
Round-trip
1 adult, Economy
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Find cheap flights from Boise to Illinois 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 Boise to IllinoisExplore the most affordable flight options available from Boise to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 16, 2026.
Explore the most affordable flight options available from Boise to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 16, 2026.
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 9/102:50 pm -
1 stop19h 27m
Wed 9/1612:17 pm -
1 stop26h 38m
Deal found 8/11![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/142:50 pm -
1 stop13h 48m
Wed 9/166:30 am -
2 stops32h 25m
Deal found 8/14![Frontier logo]()
$181
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 9/102:50 pm -
1 stop13h 48m
Wed 9/166:30 am -
2 stops32h 25m
Deal found 8/11![Frontier logo]()
$205
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 10/93:52 pm -
1 stop12h 50m
Mon 10/126:50 am -
1 stop9h 07m
Deal found 8/11![Frontier logo]()
$232
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.
Sat 10/104:55 pm -
1 stop6h 15m
Tue 10/136:05 am -
1 stop7h 10m
Deal found 8/13![Southwest logo]()
$239
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.
Wed 9/238:55 am -
1 stop8h 06m
Tue 9/297:40 pm -
1 stop5h 18m
Deal found 8/12![Delta logo]()
$239
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 9/102:50 pm -
1 stop13h 48m
Sun 9/138:55 pm -
1 stop18h 00m
Deal found 8/11![Frontier logo]()
$241
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 9/122:11 pm -
1 stop7h 33m
Sat 9/199:59 am -
2 stops9h 54m
Deal found 8/12![Delta logo]()
$244
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 9/261:50 pm -
1 stop13h 40m
Wed 9/306:00 pm -
1 stop6h 15m
Deal found 8/11![Southwest logo]()
$245
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.
Wed 11/116:00 am -
2 stops9h 39m
Sat 11/149:30 am -
2 stops7h 43m
Deal found 8/11![Delta logo]()
$249
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.
Wed 9/236:45 am -
2 stops10h 19m
Sat 9/268:25 am -
2 stops11h 15m
Deal found 8/13![Delta logo]()
$249
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 9/102:50 pm -
1 stop19h 27m
Sun 9/1312:27 pm -
1 stop26h 28m
Deal found 8/11![Frontier logo]()
$254
Best flights from Boise to IllinoisDiscover carefully curated flight deals from Boise to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 16, 2026.
Discover carefully curated flight deals from Boise to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 16, 2026.
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.
Wed 10/213:00 pm -
1 stop5h 36m
Sat 10/249:59 am -
2 stops7h 15m
Deal found 8/11![Delta logo]()
$244
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.
Wed 10/214:40 pm -
1 stop6h 10m
Mon 10/266:15 pm -
1 stop8h 25m
Deal found 8/11![Southwest logo]()
$257
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.
Wed 10/2112:26 pm -
Nonstop3h 39m
Sat 10/248:40 am -
Nonstop3h 48m
Deal found 8/11![United Airlines logo]()
$257
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:18 pm -
1 stop6h 41m
Sat 10/246:02 am -
1 stop7h 33m
Deal found 8/13![Alaska Airlines logo]()
$269
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/51:55 pm -
2 stops8h 47m
Tue 9/85:42 am -
1 stop6h 34m
Deal found 8/13![American Airlines logo]()
$276
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.
Wed 11/41:06 pm -
1 stop7h 54m
Tue 11/107:35 am -
2 stops12h 02m
Deal found 8/13![Delta logo]()
$244
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 11/102:51 pm -
1 stop5h 08m
Wed 11/115:00 am -
1 stop7h 30m
Deal found 8/11![United Airlines logo]()
$264
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.
Tue 11/106:20 am -
2 stops8h 00m
Wed 11/115:05 am -
1 stop6h 40m
Deal found 8/11![Southwest logo]()
$274
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 9/2811:10 pm -
2 stops10h 27m
Wed 9/3012:50 pm -
1 stop6h 50m
Deal found 8/11![Delta logo]()
$262
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 10/294:18 pm -
1 stop6h 41m
Mon 11/27:00 am -
1 stop9h 27m
Deal found 8/11![Alaska Airlines logo]()
$299
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.
Mon 11/93:55 pm -
1 stop5h 25m
Tue 11/108:30 am -
2 stops7h 40m
Deal found 8/11![Southwest logo]()
$274
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.
Wed 9/98:55 am -
1 stop8h 06m
Sat 9/197:00 am -
1 stop9h 16m
Deal found 8/13![Delta logo]()
$264
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 9/233:21 pm -
1 stop7h 42m
Tue 10/63:58 pm -
1 stop7h 31m
Deal found 8/12![American Airlines logo]()
$339
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.
Wed 10/2110:34 am -
2 stops10h 26m
Mon 10/262:03 pm -
2 stops9h 05m
Deal found 8/11![Delta logo]()
$267
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 10/1012:26 pm -
Nonstop3h 39m
Wed 10/148:40 am -
Nonstop3h 48m
Deal found 8/11![United Airlines logo]()
$333
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 10/106:00 am -
2 stops8h 55m
Wed 10/146:05 am -
1 stop7h 10m
Deal found 8/11![Southwest logo]()
$307
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 9/123:21 pm -
1 stop7h 42m
Sat 9/194:24 pm -
1 stop7h 03m
Deal found 8/12![American Airlines logo]()
$339
This American Airlines deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/243:21 pm -
1 stop7h 47m
Tue 10/64:42 pm -
1 stop6h 47m
Deal found 8/16![American 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 9/12:44 pm -
1 stop5h 17m
Fri 10/22:28 pm -
2 stops10h 31m
Deal found 8/11![United Airlines logo]()
$344
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 11/68:30 pm -
2 stops8h 15m
Mon 11/96:05 pm -
1 stop8h 20m
Deal found 8/11![Southwest logo]()
$318
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.
Fri 11/1311:35 pm -
1 stop9h 58m
Wed 11/186:00 am -
1 stop8h 34m
Deal found 8/11![Delta logo]()
$294
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 10/172:41 pm -
1 stop7h 36m
Wed 10/214:38 pm -
1 stop7h 01m
Deal found 8/12![American Airlines logo]()
$339
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.
Tue 9/83:19 pm -
1 stop7h 49m
Tue 9/154:33 pm -
1 stop6h 54m
Deal found 8/11![American Airlines logo]()
$339
This Southwest deal was found by Cheapflights users on 8/14. 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.
Mon 9/142:55 pm -
1 stop7h 55m
Wed 9/166:40 am -
1 stop5h 15m
Deal found 8/14![Southwest logo]()
$342
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.
Thu 10/11:06 pm -
1 stop7h 49m
Fri 10/28:25 am -
1 stop6h 19m
Deal found 8/12![Delta logo]()
$312
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.
Wed 9/28:23 am -
1 stop8h 22m
Fri 10/22:28 pm -
2 stops10h 31m
Deal found 8/11![United Airlines logo]()
$379
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.
Wed 9/23:19 pm -
1 stop7h 49m
Sat 10/34:33 pm -
1 stop6h 54m
Deal found 8/11![American Airlines logo]()
$339
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 9/51:59 pm -
1 stop7h 37m
Fri 9/115:03 pm -
2 stops7h 55m
Deal found 8/11![Delta logo]()
$316
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 10/295:00 am -
2 stops9h 43m
Mon 11/24:39 pm -
1 stop7h 20m
Deal found 8/12![United Airlines logo]()
$394
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.
Thu 9/32:49 pm -
1 stop7h 53m
Sun 9/68:36 am -
2 stops9h 13m
Deal found 8/12![American Airlines logo]()
$353
Last-minute flights from Boise to IllinoisDiscover last-minute flight deals from Boise to Illinois. Data last updated August 16, 2026 and is based on user searches.
Discover last-minute flight deals from Boise to Illinois. Data last updated August 16, 2026 and is based on user searches.
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 9/102:50 pm -
1 stop19h 27m
Wed 9/1612:17 pm -
1 stop26h 38m
Deal found 8/11![Frontier logo]()
$180
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 9/102:50 pm -
1 stop13h 48m
Wed 9/166:30 am -
2 stops32h 25m
Deal found 8/11![Frontier logo]()
$205
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 9/102:50 pm -
1 stop13h 48m
Sun 9/138:55 pm -
1 stop18h 00m
Deal found 8/11![Frontier logo]()
$241
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 9/102:50 pm -
1 stop13h 48m
Thu 9/178:55 pm -
1 stop18h 00m
Deal found 8/11![Frontier logo]()
$254
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 9/102:50 pm -
1 stop19h 27m
Sun 9/1312:27 pm -
1 stop26h 28m
Deal found 8/12![Frontier logo]()
$255
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 9/122:11 pm -
1 stop7h 33m
Sat 9/192:00 pm -
1 stop7h 57m
Deal found 8/12![Delta logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/142:50 pm -
1 stop13h 48m
Wed 9/166:30 am -
2 stops32h 25m
Deal found 8/14![Frontier logo]()
$181
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.
Mon 9/143:45 pm -
1 stop7h 05m
Sat 9/195:40 am -
1 stop8h 20m
Deal found 8/13![Southwest logo]()
$257
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.
Wed 9/238:55 am -
1 stop8h 06m
Tue 9/297:40 pm -
1 stop5h 18m
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.
Wed 9/236:45 am -
2 stops10h 19m
Sat 9/268:25 am -
2 stops11h 15m
Deal found 8/13![Delta logo]()
$249
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 9/261:50 pm -
1 stop13h 40m
Wed 9/306:00 pm -
1 stop6h 15m
Deal found 8/11![Southwest logo]()
$245
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 9/2811:10 pm -
1 stop9h 39m
Wed 9/302:00 pm -
2 stops10h 58m
Deal found 8/11![Delta logo]()
$262
One-way flights from Boise to IllinoisSearch for one-way flight options from Boise to Illinois. Find affordable one-way fares based on user searches. Data last updated August 16, 2026.
Search for one-way flight options from Boise to Illinois. Find affordable one-way fares based on user searches. Data last updated August 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/163:52 pm -
1 stop12h 43m
Deal found 8/14![Frontier logo]()
$89
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.
Mon 9/142:50 pm -
1 stop13h 48m
Deal found 8/12![Frontier logo]()
$94
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 9/102:50 pm -
1 stop13h 48m
Deal found 8/12![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/122:50 pm -
2 stops32h 34m
Deal found 8/14![Frontier logo]()
$106
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.
Mon 9/212:50 pm -
2 stops32h 33m
Deal found 8/11![Frontier logo]()
$107
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 10/12:50 pm -
1 stop13h 48m
Deal found 8/12![Frontier logo]()
$108
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.
Tue 9/81:24 pm -
1 stop28h 53m
Deal found 8/12![Frontier logo]()
$111
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.
Fri 10/22:50 pm -
2 stops32h 33m
Deal found 8/12![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” 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 9/142:50 pm -
1 stop19h 42m
Deal found 8/15![Frontier logo]()
$117
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.
Mon 9/142:50 pm -
2 stops25h 56m
Deal found 8/13![Frontier logo]()
$117
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 2/91:43 pm -
1 stop7h 27m
Deal found 8/12![Delta logo]()
$120
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.
Mon 10/122:50 pm -
2 stops20h 27m
Deal found 8/12![Frontier logo]()
$124
Find flight deals from Boise to Illinois
Keep the following information in mind while searching for Boise to Illinois flight deals. Data was last updated August 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $180 (CheapOair) |
One-way from | $89 (Kiwi.com) |
Popular in | March |
Cheapest in | February |
Average price | $384 |
Good round-trip deal | $408 or less |
Good one-way deal | $259 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Boise to Illinois 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 16, 2026.
Use the filters below to find and compare flights from Boise to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BoiseChicago
BOI Boise Air Term. Gowen Fld - ORD Chicago O'Hare Intl
BOIORD
Boise Air Term. Gowen Fld
Wed 10/21
3:00 pm-9:36 pm
1 stop5h 36m
Chicago O'Hare Intl
Sat 10/24
9:59 am-4:14 pm
2 stops7h 15m
$244
BoiseChicago
BOI Boise Air Term. Gowen Fld - ORD Chicago O'Hare Intl
BOIORD
Boise Air Term. Gowen Fld
Wed 11/4
1:06 pm-10:00 pm
1 stop7h 54m
Chicago O'Hare Intl
Tue 11/10
7:35 am-6:37 pm
2 stops12h 02m
$244
BoiseChicago
BOI Boise Air Term. Gowen Fld - MDW Chicago Midway
BOIMDW
Boise Air Term. Gowen Fld
Wed 10/21
4:40 pm-11:50 pm
1 stop6h 10m
Chicago Midway
Mon 10/26
6:15 pm-1:40 am
1 stop8h 25m
$257
Quickest round-trip
BoiseChicago
BOI Boise Air Term. Gowen Fld - ORD Chicago O'Hare Intl
BOIORD
Boise Air Term. Gowen Fld
Wed 10/21
12:26 pm-5:05 pm
Nonstop3h 39m
Chicago O'Hare Intl
Sat 10/24
8:40 am-11:28 am
Nonstop3h 48m
$257
BoiseChicago
BOI Boise Air Term. Gowen Fld - ORD Chicago O'Hare Intl
BOIORD
Boise Air Term. Gowen Fld
Mon 9/28
11:10 pm-10:37 am
2 stops10h 27m
Chicago O'Hare Intl
Wed 9/30
12:50 pm-6:40 pm
1 stop6h 50m
$262
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Tue 11/10
2:51 pm-8:59 pm
1 stop5h 08m
Lambert-St Louis
Wed 11/11
5:00 am-11:30 am
1 stop7h 30m
$264
BoiseChicago
BOI Boise Air Term. Gowen Fld - ORD Chicago O'Hare Intl
BOIORD
Boise Air Term. Gowen Fld
Wed 9/9
8:55 am-6:01 pm
1 stop8h 06m
Chicago O'Hare Intl
Sat 9/19
7:00 am-3:16 pm
1 stop9h 16m
$264
BoiseChicago
BOI Boise Air Term. Gowen Fld - ORD Chicago O'Hare Intl
BOIORD
Boise Air Term. Gowen Fld
Wed 10/21
10:34 am-10:00 pm
2 stops10h 26m
Chicago O'Hare Intl
Mon 10/26
2:03 pm-10:08 pm
2 stops9h 05m
$267
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Wed 10/21
4:18 pm-11:59 pm
1 stop6h 41m
Lambert-St Louis
Sat 10/24
6:02 am-12:35 pm
1 stop7h 33m
$269
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Tue 11/10
6:20 am-3:20 pm
2 stops8h 00m
Lambert-St Louis
Wed 11/11
5:05 am-10:45 am
1 stop6h 40m
$274
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Boise to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Boise with our price prediction graph.
BOI-STL
BOI-ORD
BOI-MDW
BOI-PIA
BOI-BMI
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 Boise to Illinois
BOI-USIL
BOI-STL
BOI-ORD
BOI-MDW
BOI-PIA
What is the cheapest month to book a flight from Boise to Illinois?
Currently, February is the cheapest month in which you can book a flight from Boise to Illinois (average of $340). Flying from Boise to Illinois in March is currently the most expensive (average of $474). 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 BOI to IL?
Find hourly flight availability from Boise to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 16, 2026.
When flying from Boise to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 27% versus a flight at noon.
Weekly flight availability from Boise to Illinois
Explore weekly flight availability from Boise to Illinois. 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 16, 2026.
The most flights from BOI to USIL are scheduled on a Friday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from Boise to Illinois?
Airfare is below average for this route at the moment.
Boise to Illinois flights typically cost between $353 and $484 in September.The cheapest round-trip price found within the last 5 days was $181 on Frontier (Sep 14-Sep 16).
How far ahead should I book a flight from Boise to Illinois?
The price you pay for your flight from Boise to Illinois may vary depending on when you book. For the best chance of a lower fare, look to book 77 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Reviews of airlines servicing Illinois
Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated August 16, 2026.
Read through reviews of airlines operating flights from Boise to Illinois, such as Southwest,Alaska Airlines, andDelta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Food
7.0
Entertainment
7.5
Overall
8.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Reviews
1 / 20
6.0
GoodReza,Jun 2026
TPA - MDW
Related info for your journey
Find useful and relevant information for your journey from Boise to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Boise to Illinois
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Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Boise to Illinois by cabin class
Find flights from Boise to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Boise and Illinois flights
Browse other Boise and Illinois flight options. Last updated on August 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Boise to Illinois flights
Consider these flights traveling from Boise to Illinois.
Top 5 airlines flying from Boise to Illinois
Discover the top 5 airlines that operate flights from Boise to Illinois. 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 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$228 | Average$364 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$268 | Average$443 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$268 | Average$512 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$298 | Average$390 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$314 | Average$455 | FlexibilityNo cancel fee | On-time63% |