$80+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Mar 5 — Mar 121
1 adult, Economy
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Find cheap flights from Boise to Illinois with Cheapflights
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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 February 3, 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 February 3, 2026.
This Expedia deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/2612:38 pm
BOI
- ORD
1 stop9h 36m
Multiple Airlines
Mon 3/25:29 pm
ORD
- BOI
1 stop7h 30m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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.
Sat 2/282:20 pm
BOI
- ORD
1 stop8h 36m
Hawaiian Airlines
Mon 3/95:29 pm
ORD
- BOI
1 stop7h 30m
Hawaiian Airlines
Deal found 2/2![Hawaiian Airlines logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/35:40 am
BOI
- ORD
1 stop6h 31m
Alaska Airlines
Tue 3/177:00 am
ORD
- BOI
1 stop9h 08m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$213
This Alaska Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 9/188:24 pm
BOI
- ORD
1 stop9h 36m
Alaska Airlines
Wed 9/233:09 pm
ORD
- BOI
1 stop10h 02m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$229
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/2812:59 pm
BOI
- STL
1 stop7h 39m
Delta
Sat 3/77:00 am
STL
- BOI
1 stop6h 09m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/32:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Tue 3/106:25 am
STL
- BOI
2 stops8h 07m
United Airlines
Deal found 2/2![United Airlines logo]()
$242
This Alaska Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 4/237:43 am
BOI
- ORD
1 stop10h 20m
Alaska Airlines
Fri 5/13:52 pm
ORD
- BOI
1 stop8h 10m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 4/272:57 pm
BOI
- ORD
1 stop8h 02m
Alaska Airlines
Mon 5/48:50 am
ORD
- BOI
1 stop28h 42m
Alaska Airlines
Deal found 1/31![Alaska Airlines logo]()
$253
This American Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 8/261:14 pm
BOI
- ORD
Nonstop3h 40m
American Airlines
Sat 8/297:53 am
ORD
- BOI
1 stop9h 51m
American Airlines
Deal found 2/1![American Airlines logo]()
$258
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/35:24 pm
BOI
- ORD
1 stop5h 35m
United Airlines
Tue 3/178:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Deal found 2/2![United Airlines logo]()
$259
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/31:30 pm
BOI
- ORD
Nonstop3h 40m
American Airlines
Tue 3/109:47 am
ORD
- BOI
Nonstop4h 13m
American Airlines
Deal found 2/3![American Airlines logo]()
$262
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/31:43 pm
BOI
- MDW
1 stop7h 50m
Delta
Tue 3/179:30 am
MDW
- BOI
1 stop5h 35m
Delta
Deal found 2/2![Delta logo]()
$269
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 February 3, 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 February 3, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/29:52 am
BOI
- ORD
1 stop13h 04m
Alaska Airlines
Mon 3/95:29 pm
ORD
- BOI
1 stop7h 30m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$229
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/32:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Tue 3/104:30 pm
STL
- BOI
1 stop7h 13m
United Airlines
Deal found 2/2![United Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/2812:59 pm
BOI
- STL
1 stop7h 39m
Delta
Sat 3/77:00 am
STL
- BOI
1 stop6h 09m
Delta
Deal found 2/3![Delta logo]()
$237
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/31:30 pm
BOI
- ORD
Nonstop3h 40m
American Airlines
Tue 3/109:47 am
ORD
- BOI
Nonstop4h 13m
American Airlines
Deal found 2/3![American Airlines logo]()
$262
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/311:20 am
BOI
- MDW
1 stop7h 35m
Southwest
Tue 3/176:35 pm
MDW
- BOI
1 stop6h 55m
Southwest
Deal found 2/1![Southwest logo]()
$269
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/243:47 pm
BOI
- ORD
1 stop7h 09m
Alaska Airlines
Wed 2/255:29 pm
ORD
- BOI
1 stop7h 30m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$229
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/32:40 pm
BOI
- ORD
1 stop8h 19m
United Airlines
Tue 3/178:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Deal found 2/1![United Airlines logo]()
$259
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/31:43 pm
BOI
- MDW
1 stop7h 50m
Delta
Tue 3/102:05 pm
MDW
- BOI
1 stop8h 04m
Delta
Deal found 2/3![Delta logo]()
$269
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/274:25 pm
BOI
- MDW
1 stop7h 10m
Southwest
Mon 3/28:10 am
MDW
- BOI
1 stop14h 05m
Southwest
Deal found 2/1![Southwest logo]()
$275
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 4/152:18 pm
BOI
- MDW
1 stop7h 10m
Delta
Sat 4/186:00 am
MDW
- BOI
1 stop8h 07m
Delta
Deal found 2/3![Delta logo]()
$269
This CheapOair deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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.
Tue 3/242:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Mon 3/304:20 pm
STL
- BOI
1 stop7h 37m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$281
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/252:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Mon 3/24:30 pm
STL
- BOI
1 stop6h 02m
United Airlines
Deal found 2/2![United Airlines logo]()
$281
This Southwest deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 4/152:00 pm
BOI
- MDW
1 stop7h 00m
Southwest
Fri 4/176:00 am
MDW
- BOI
1 stop5h 35m
Southwest
Deal found 2/3![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 4/305:34 am
BOI
- MDW
1 stop6h 58m
Delta
Mon 5/49:31 am
MDW
- BOI
1 stop5h 55m
Delta
Deal found 2/2![Delta logo]()
$269
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/210:24 am
BOI
- ORD
1 stop5h 24m
Delta
Wed 7/87:20 am
ORD
- BOI
1 stop8h 02m
Delta
Deal found 1/31![Delta logo]()
$269
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 6/3010:24 am
BOI
- ORD
1 stop8h 19m
Delta
Sat 7/45:00 pm
ORD
- BOI
1 stop7h 11m
Delta
Deal found 1/31![Delta logo]()
$269
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/42:45 pm
BOI
- ORD
1 stop8h 02m
Delta
Wed 7/87:20 am
ORD
- BOI
1 stop8h 02m
Delta
Deal found 1/31![Delta logo]()
$269
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 7/46:00 am
BOI
- ORD
1 stop5h 21m
Delta
Sun 7/56:00 am
ORD
- BOI
1 stop5h 59m
Delta
Deal found 2/2![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/186:59 pm
BOI
- CMI
2 stops12h 55m
United Airlines
Sat 7/259:49 am
CMI
- BOI
2 stops13h 15m
United Airlines
Deal found 1/31![United Airlines logo]()
$394
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/61:58 pm
BOI
- MLI
1 stop7h 00m
American Airlines
Sat 2/77:32 am
MLI
- BOI
1 stop8h 19m
American Airlines
Deal found 2/3![American Airlines logo]()
$506
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/210:24 am
BOI
- ORD
1 stop5h 24m
Delta
Sat 7/49:30 am
ORD
- BOI
1 stop5h 33m
Delta
Deal found 1/31![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/171:30 pm
BOI
- PIA
1 stop18h 41m
American Airlines
Sat 2/212:50 pm
PIA
- BOI
1 stop23h 10m
American Airlines
Deal found 2/2![American Airlines logo]()
$507
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/311:30 pm
BOI
- ORD
1 stop9h 34m
Delta
Fri 7/101:15 pm
ORD
- BOI
1 stop10h 23m
Delta
Deal found 1/31![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/176:59 pm
BOI
- BMI
2 stops12h 58m
United Airlines
Sat 7/259:44 am
BMI
- BOI
2 stops13h 20m
United Airlines
Deal found 1/31![United Airlines logo]()
$439
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/51:43 pm
BOI
- ORD
1 stop9h 13m
Delta
Sun 3/88:55 am
ORD
- BOI
1 stop6h 09m
Delta
Deal found 2/1![Delta logo]()
$269
This United Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/176:59 pm
BOI
- BMI
2 stops12h 58m
United Airlines
Fri 7/249:44 am
BMI
- BOI
2 stops13h 20m
United Airlines
Deal found 1/31![United Airlines logo]()
$439
This American Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/182:58 pm
BOI
- BMI
1 stop7h 52m
American Airlines
Sat 7/256:48 am
BMI
- BOI
1 stop9h 27m
American Airlines
Deal found 1/31![American Airlines logo]()
$540
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/310:24 am
BOI
- ORD
1 stop8h 19m
Delta
Wed 7/87:20 am
ORD
- BOI
1 stop8h 02m
Delta
Deal found 1/31![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 7/1812:19 pm
BOI
- CMI
1 stop8h 52m
American Airlines
Sat 7/256:20 am
CMI
- BOI
1 stop8h 48m
American Airlines
Deal found 1/31![American Airlines logo]()
$546
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/612:19 pm
BOI
- MLI
1 stop8h 17m
United Airlines
Sun 2/83:45 pm
MLI
- BOI
1 stop8h 12m
United Airlines
Deal found 2/3![United Airlines logo]()
$469
Last-minute flights from Boise to IllinoisDiscover last-minute flight deals from Boise to Illinois. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from Boise to Illinois. Data last updated February 3, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/238:27 pm
BOI
- ORD
1 stop16h 44m
Alaska Airlines
Wed 2/255:29 pm
ORD
- BOI
1 stop7h 30m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/249:52 am
BOI
- ORD
2 stops13h 07m
Alaska Airlines
Wed 2/257:00 am
ORD
- BOI
1 stop8h 58m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$271
This Expedia deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/2612:38 pm
BOI
- ORD
1 stop9h 36m
Multiple Airlines
Mon 3/25:29 pm
ORD
- BOI
1 stop7h 30m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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.
Sat 2/282:20 pm
BOI
- ORD
1 stop8h 36m
Hawaiian Airlines
Mon 3/95:29 pm
ORD
- BOI
1 stop7h 30m
Hawaiian Airlines
Deal found 2/2![Hawaiian Airlines logo]()
$207
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/2812:59 pm
BOI
- STL
1 stop7h 39m
Delta
Sat 3/77:00 am
STL
- BOI
1 stop6h 09m
Delta
Deal found 2/3![Delta logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/35:40 am
BOI
- ORD
1 stop6h 31m
Alaska Airlines
Tue 3/177:00 am
ORD
- BOI
1 stop9h 08m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$213
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/32:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Tue 3/106:25 am
STL
- BOI
2 stops8h 07m
United Airlines
Deal found 2/2![United Airlines logo]()
$242
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/35:24 pm
BOI
- ORD
1 stop5h 35m
United Airlines
Tue 3/178:55 am
ORD
- BOI
Nonstop4h 18m
United Airlines
Deal found 2/2![United Airlines logo]()
$259
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/31:30 pm
BOI
- ORD
Nonstop3h 40m
American Airlines
Tue 3/109:47 am
ORD
- BOI
Nonstop4h 13m
American Airlines
Deal found 2/3![American Airlines logo]()
$262
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 3/311:20 am
BOI
- MDW
1 stop7h 35m
Southwest
Tue 3/176:35 pm
MDW
- BOI
1 stop6h 55m
Southwest
Deal found 2/1![Southwest logo]()
$269
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/38:50 am
BOI
- ORD
2 stops12h 02m
Delta
Tue 3/106:15 am
ORD
- BOI
1 stop8h 49m
Delta
Deal found 2/3![Delta logo]()
$274
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/204:40 pm
BOI
- ORD
1 stop6h 12m
Delta
Wed 3/252:20 pm
ORD
- BOI
1 stop8h 44m
Delta
Deal found 2/2![Delta logo]()
$269
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 February 3, 2026.
Search for one-way flight options from Boise to Illinois. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This Frontier deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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.
Thu 2/2612:38 pm
BOI
- ORD
1 stop9h 36m
Frontier
Deal found 2/1![Frontier logo]()
$80
This WAYA deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/512:38 pm
BOI
- ORD
1 stop9h 36m
Frontier
Deal found 2/1![Frontier logo]()
$86
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/286:28 am
BOI
- ORD
1 stop9h 05m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 3/2612:15 pm
BOI
- STL
1 stop20h 34m
Frontier
Deal found 2/2![Frontier logo]()
$101
This Orbitz deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/246:04 pm
BOI
- ORD
1 stop11h 35m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$104
This CheapOair deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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 4/3011:53 am
BOI
- ORD
1 stop20h 57m
Frontier
Deal found 1/31![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/2711:56 am
BOI
- STL
1 stop25h 00m
Frontier
Deal found 2/1![Frontier logo]()
$108
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/288:30 am
BOI
- MDW
1 stop5h 00m
Southwest
Deal found 2/1![Southwest logo]()
$113
This Southwest deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/285:55 am
BOI
- ORD
1 stop9h 20m
Southwest
Deal found 2/1![Southwest logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” 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 2/2711:56 am
BOI
- MDW
2 stops26h 23m
Frontier
Deal found 2/1![Frontier logo]()
$115
This Alaska Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 2/275:40 am
BOI
- ORD
1 stop6h 31m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$115
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” 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 4/116:00 am
BOI
- STL
1 stop7h 43m
Delta
Deal found 2/2![Delta logo]()
$119
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 February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $194 (Expedia) |
One-way from | $80 (Frontier) |
Popular in | December |
Cheapest in | September |
Average price | $328 |
Good round-trip deal | $388 or less |
Good one-way deal | $278 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 February 3, 2026.
Use the filters below to find and compare flights from Boise to Illinois that are best for you.
Fly from
Boise
Fly to
Illinois
Route
Depart
Return
Price
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Mon 3/2
9:52 am-11:56 pm
1 stop13h 04m
Chicago O'Hare Intl
Mon 3/9
5:29 pm-11:59 pm
1 stop7h 30m
$229
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Tue 2/24
3:47 pm-11:56 pm
1 stop7h 09m
Chicago O'Hare Intl
Wed 2/25
5:29 pm-11:59 pm
1 stop7h 30m
$229
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 3/3
2:40 pm-8:26 pm
1 stop4h 46m
Lambert-St Louis
Tue 3/10
4:30 pm-10:43 pm
1 stop7h 13m
$237
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Sat 2/28
12:59 pm-9:38 pm
1 stop7h 39m
Lambert-St Louis
Sat 3/7
7:00 am-12:09 pm
1 stop6h 09m
$237
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Tue 3/3
2:40 pm-11:59 pm
1 stop8h 19m
Chicago O'Hare Intl
Tue 3/17
8:55 am-12:13 pm
Nonstop4h 18m
$259
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Tue 3/3
1:30 pm-6:10 pm
Nonstop3h 40m
Chicago O'Hare Intl
Tue 3/10
9:47 am-1:00 pm
Nonstop4h 13m
$262
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Tue 3/3
11:20 am-7:55 pm
1 stop7h 35m
Chicago Midway
Tue 3/17
6:35 pm-12:30 am
1 stop6h 55m
$269
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Tue 3/3
1:43 pm-10:33 pm
1 stop7h 50m
Chicago Midway
Tue 3/10
2:05 pm-9:09 pm
1 stop8h 04m
$269
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Wed 4/15
2:18 pm-10:28 pm
1 stop7h 10m
Chicago Midway
Sat 4/18
6:00 am-1:07 pm
1 stop8h 07m
$269
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Thu 4/30
5:34 am-1:32 pm
1 stop6h 58m
Chicago Midway
Mon 5/4
9:31 am-2:26 pm
1 stop5h 55m
$269
Showing 1-10 of 60 results
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-ORD
BOI-STL
BOI-MDW
BOI-PIA
BOI-MLI
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-ORD
BOI-STL
BOI-MDW
BOI-PIA
What is the cheapest month to book a flight from Boise to Illinois?
Currently, May is the cheapest month in which you can book a flight from Boise to Illinois (average of $87). Flying from Boise to Illinois in December is currently the most expensive (average of $276). 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 February 3, 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 44% versus a flight in the evening.
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 February 3, 2026.
The most flights from BOI to USIL are scheduled on a Monday (8 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).
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 February 3, 2026.
Read through reviews of airlines operating flights from Boise to Illinois, such as Alaska Airlines, Southwest, and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Entertainment
7.0
Boarding
8.1
Crew
8.5
Food
7.1
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
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.
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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 February 3, 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 February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$87 | Average$291 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$219 | Average$538 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$233 | Average$385 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$249 | Average$456 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$260 | Average$353 | FlexibilityNo cancel fee | On-time75% |