$105+ 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 6/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ORD
Jun 10 — Jun 171
Round-trip
1 adult, Economy
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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 May 11, 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 May 11, 2026.
This Mytrip deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/211:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Wed 6/248:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Deal found 5/6![Frontier logo]()
$239
This Kiwi.com deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” 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 7/141:25 pm
BOI
- STL
1 stop28h 58m
Frontier
Mon 7/204:52 pm
STL
- BOI
2 stops20h 37m
Frontier
Deal found 5/7![Frontier logo]()
$285
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/210:41 am
BOI
- MLI
2 stops11h 33m
United Airlines
Sat 7/46:30 am
MLI
- BOI
1 stop6h 02m
United Airlines
Deal found 5/6![United Airlines logo]()
$325
This Alaska Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/35:56 am
BOI
- ORD
1 stop6h 25m
Alaska Airlines
Sat 10/33:49 pm
ORD
- BOI
1 stop9h 09m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$329
This Expedia deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/21:25 pm
BOI
- ORD
1 stop6h 07m
Multiple Airlines
Thu 6/46:00 am
ORD
- BOI
1 stop8h 02m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$330
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/211:39 pm
BOI
- MLI
1 stop9h 41m
Delta
Sat 7/45:56 am
MLI
- BOI
1 stop7h 58m
Delta
Deal found 5/6![Delta logo]()
$330
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/210:41 am
BOI
- MLI
2 stops11h 33m
United Airlines
Fri 7/36:30 am
MLI
- BOI
1 stop6h 02m
United Airlines
Deal found 5/6![United Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/144:20 pm
BOI
- MDW
1 stop6h 45m
Southwest
Tue 7/286:00 am
MDW
- BOI
1 stop8h 25m
Southwest
Deal found 5/5![Southwest logo]()
$335
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/201:59 pm
BOI
- ORD
1 stop9h 29m
American Airlines
Sat 6/277:25 am
ORD
- BOI
1 stop7h 04m
American Airlines
Deal found 5/10![American Airlines logo]()
$335
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/610:25 am
BOI
- MDW
1 stop9h 35m
Southwest
Tue 6/95:30 am
MDW
- BOI
1 stop5h 35m
Southwest
Deal found 5/8![Southwest logo]()
$340
This American Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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.
Mon 6/83:12 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Tue 6/1611:30 am
ORD
- BOI
Nonstop3h 52m
American Airlines
Deal found 5/6![American Airlines logo]()
$340
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/25:15 pm
BOI
- MDW
1 stop11h 10m
Southwest
Fri 7/32:40 pm
MDW
- BOI
Nonstop3h 35m
Southwest
Deal found 5/6![Southwest logo]()
$341
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 May 11, 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 May 11, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 8/194:17 pm
BOI
- ORD
1 stop6h 42m
Alaska Airlines
Sat 8/226:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$330
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/210:41 am
BOI
- MLI
2 stops11h 33m
United Airlines
Fri 7/36:30 am
MLI
- BOI
1 stop6h 02m
United Airlines
Deal found 5/6![United Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/2311:30 am
BOI
- MDW
1 stop8h 50m
Southwest
Wed 7/14:35 pm
MDW
- BOI
2 stops8h 50m
Southwest
Deal found 5/5![Southwest logo]()
$350
This Delta deal was found by Cheapflights users on 5/10. 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 6/236:00 am
BOI
- MDW
2 stops9h 16m
Delta
Tue 6/309:54 am
MDW
- BOI
2 stops7h 58m
Delta
Deal found 5/10![Delta logo]()
$355
This American Airlines deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” 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 6/163:12 pm
BOI
- PIA
1 stop7h 22m
American Airlines
Tue 7/214:43 pm
PIA
- BOI
1 stop7h 39m
American Airlines
Deal found 5/7![American Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:46 pm
BOI
- ORD
1 stop5h 58m
United Airlines
Tue 6/235:00 am
ORD
- BOI
1 stop5h 45m
United Airlines
Deal found 5/9![United Airlines logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/12:16 pm
BOI
- ORD
1 stop8h 43m
Alaska Airlines
Tue 10/66:00 am
ORD
- BOI
1 stop7h 35m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 5/10. 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.
Wed 7/85:30 am
BOI
- MDW
1 stop6h 39m
Delta
Tue 7/141:18 pm
MDW
- BOI
2 stops9h 46m
Delta
Deal found 5/10![Delta logo]()
$360
This Southwest deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” 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 6/97:10 am
BOI
- MDW
Nonstop3h 20m
Southwest
Thu 6/116:00 pm
MDW
- BOI
2 stops8h 10m
Southwest
Deal found 5/7![Southwest logo]()
$372
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:00 am
BOI
- ORD
1 stop4h 59m
Delta
Tue 7/143:55 pm
ORD
- BOI
2 stops9h 10m
Delta
Deal found 5/9![Delta logo]()
$360
This American Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 7/43:12 pm
BOI
- STL
1 stop8h 03m
American Airlines
Sat 7/117:02 am
STL
- BOI
1 stop8h 20m
American Airlines
Deal found 5/5![American Airlines logo]()
$426
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/610:25 am
BOI
- MDW
1 stop9h 35m
Southwest
Sat 6/1310:15 am
MDW
- BOI
2 stops8h 05m
Southwest
Deal found 5/5![Southwest logo]()
$388
This Delta deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/295:30 am
BOI
- MDW
1 stop6h 39m
Delta
Fri 7/31:49 pm
MDW
- BOI
1 stop8h 06m
Delta
Deal found 5/5![Delta logo]()
$365
This Alaska Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:20 am
BOI
- STL
1 stop6h 44m
Alaska Airlines
Wed 8/266:00 am
STL
- BOI
1 stop9h 22m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$403
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 8/1812:23 pm
BOI
- PIA
1 stop6h 02m
United Airlines
Sat 8/225:31 pm
PIA
- BOI
1 stop6h 15m
United Airlines
Deal found 5/5![United Airlines logo]()
$419
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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.
Sun 7/57:15 pm
BOI
- MDW
1 stop8h 25m
Southwest
Thu 7/96:25 pm
MDW
- BOI
2 stops7h 45m
Southwest
Deal found 5/5![Southwest logo]()
$400
This Delta deal was found by Cheapflights users on 5/10. 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 7/911:42 pm
BOI
- MDW
1 stop9h 23m
Delta
Tue 7/146:00 am
MDW
- BOI
1 stop7h 53m
Delta
Deal found 5/10![Delta logo]()
$374
This American Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/234:05 pm
BOI
- PIA
1 stop6h 28m
American Airlines
Wed 5/274:46 pm
PIA
- BOI
1 stop6h 43m
American Airlines
Deal found 5/8![American Airlines logo]()
$454
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/210:41 am
BOI
- MLI
2 stops9h 41m
United Airlines
Sat 7/41:15 pm
MLI
- BOI
2 stops9h 50m
United Airlines
Deal found 5/6![United Airlines logo]()
$431
This Southwest deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/276:00 pm
BOI
- MDW
1 stop10h 10m
Southwest
Tue 6/305:25 am
MDW
- BOI
1 stop6h 40m
Southwest
Deal found 5/9![Southwest logo]()
$402
This Delta deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” 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 8/1211:12 am
BOI
- ORD
2 stops11h 46m
Delta
Wed 8/192:12 pm
ORD
- BOI
2 stops10h 47m
Delta
Deal found 5/7![Delta logo]()
$376
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/94:06 pm
BOI
- PIA
1 stop6h 32m
American Airlines
Tue 6/164:47 pm
PIA
- BOI
1 stop6h 41m
American Airlines
Deal found 5/10![American Airlines logo]()
$456
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/245:46 pm
BOI
- STL
1 stop5h 12m
United Airlines
Sun 6/286:00 am
STL
- BOI
1 stop6h 27m
United Airlines
Deal found 5/5![United Airlines logo]()
$435
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/24:05 pm
BOI
- MDW
1 stop6h 15m
Southwest
Thu 6/46:20 am
MDW
- BOI
2 stops9h 25m
Southwest
Deal found 5/6![Southwest logo]()
$402
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/43:29 pm
BOI
- ORD
1 stop6h 59m
Delta
Mon 8/101:59 pm
ORD
- BOI
2 stops9h 31m
Delta
Deal found 5/9![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:35 pm
BOI
- STL
2 stops8h 05m
Southwest
Thu 9/246:00 am
STL
- BOI
1 stop6h 30m
Southwest
Deal found 5/6![Southwest logo]()
$409
This American Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/14:05 pm
BOI
- PIA
1 stop6h 33m
American Airlines
Fri 6/57:11 pm
PIA
- BOI
1 stop20h 11m
American Airlines
Deal found 5/8![American Airlines logo]()
$500
This United Airlines deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” 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 6/165:00 am
BOI
- PIA
2 stops7h 57m
United Airlines
Tue 7/216:30 am
PIA
- BOI
1 stop6h 02m
United Airlines
Deal found 5/7![United Airlines logo]()
$466
This Delta deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:38 am
BOI
- ORD
2 stops10h 15m
Delta
Sat 10/101:35 pm
ORD
- BOI
2 stops11h 29m
Delta
Deal found 5/8![Delta logo]()
$386
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/47:25 am
BOI
- STL
1 stop5h 05m
Southwest
Sat 7/117:35 pm
STL
- BOI
1 stop5h 50m
Southwest
Deal found 5/8![Southwest logo]()
$426
Last-minute flights from Boise to IllinoisDiscover last-minute flight deals from Boise to Illinois. Data last updated May 11, 2026 and is based on user searches.
Discover last-minute flight deals from Boise to Illinois. Data last updated May 11, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/210:41 am
BOI
- MLI
2 stops11h 33m
United Airlines
Sat 7/46:30 am
MLI
- BOI
1 stop6h 02m
United Airlines
Deal found 5/6![United Airlines logo]()
$325
This Expedia deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/21:25 pm
BOI
- ORD
1 stop6h 07m
Multiple Airlines
Thu 6/46:00 am
ORD
- BOI
1 stop8h 02m
Multiple Airlines
Deal found 5/8![Multiple Airlines logo]()
$330
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/211:39 pm
BOI
- MLI
1 stop9h 41m
Delta
Sat 7/45:56 am
MLI
- BOI
1 stop7h 58m
Delta
Deal found 5/6![Delta logo]()
$330
This United Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/210:41 am
BOI
- MLI
2 stops11h 33m
United Airlines
Fri 7/36:30 am
MLI
- BOI
1 stop6h 02m
United Airlines
Deal found 5/6![United Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/25:15 pm
BOI
- MDW
1 stop11h 10m
Southwest
Fri 7/32:40 pm
MDW
- BOI
Nonstop3h 35m
Southwest
Deal found 5/6![Southwest logo]()
$341
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/211:39 pm
BOI
- ORD
1 stop8h 00m
Delta
Fri 7/36:30 am
ORD
- BOI
1 stop5h 28m
Delta
Deal found 5/6![Delta logo]()
$350
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/610:25 am
BOI
- MDW
1 stop9h 35m
Southwest
Tue 6/95:30 am
MDW
- BOI
1 stop5h 35m
Southwest
Deal found 5/8![Southwest logo]()
$340
This American Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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.
Mon 6/83:12 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Tue 6/165:00 am
ORD
- BOI
1 stop9h 29m
American Airlines
Deal found 5/6![American Airlines logo]()
$340
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/201:59 pm
BOI
- ORD
1 stop9h 29m
American Airlines
Sat 6/277:25 am
ORD
- BOI
1 stop7h 04m
American Airlines
Deal found 5/10![American Airlines logo]()
$335
This Mytrip deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/211:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Wed 6/248:08 pm
STL
- BOI
1 stop17h 22m
Frontier
Deal found 5/6![Frontier logo]()
$239
This Delta deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 6/235:30 am
BOI
- MDW
1 stop6h 39m
Delta
Tue 6/301:49 pm
MDW
- BOI
1 stop8h 06m
Delta
Deal found 5/6![Delta logo]()
$345
This American Airlines deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/303:12 pm
BOI
- ORD
Nonstop3h 47m
American Airlines
Mon 7/611:30 am
ORD
- BOI
Nonstop3h 50m
American Airlines
Deal found 5/10![American Airlines logo]()
$345
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 May 11, 2026.
Search for one-way flight options from Boise to Illinois. Find affordable one-way fares based on user searches. Data last updated May 11, 2026.
This Priceline deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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.
Tue 6/301:25 pm
BOI
- ORD
1 stop6h 18m
Frontier
Deal found 5/6![Frontier logo]()
$105
This deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/41:25 pm
BOI
- ORD
1 stop6h 27m
Frontier
Deal found 5/8![Frontier logo]()
$107
This deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/61:25 pm
BOI
- ORD
1 stop6h 27m
Frontier
Deal found 5/8![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 5/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/161:25 pm
BOI
- STL
1 stop28h 58m
Frontier
Deal found 5/10![Frontier logo]()
$125
This Frontier deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/111:25 pm
BOI
- ORD
1 stop6h 27m
Frontier
Deal found 5/9![Frontier logo]()
$126
This Mytrip deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2012:23 pm
BOI
- ORD
1 stop20h 38m
Frontier
Deal found 5/7![Frontier logo]()
$135
This CheapOair deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/141:25 pm
BOI
- STL
1 stop28h 28m
Frontier
Deal found 5/9![Frontier logo]()
$136
This Frontier deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/91:25 pm
BOI
- ORD
1 stop6h 27m
Frontier
Deal found 5/9![Frontier logo]()
$146
This Alaska Airlines deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” 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 11/48:47 am
BOI
- ORD
1 stop7h 14m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$148
This Alaska Airlines deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/314:19 pm
BOI
- ORD
1 stop6h 40m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$153
This Priceline deal was found by Cheapflights users on 5/10. 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 5/281:25 pm
BOI
- ORD
1 stop6h 07m
Frontier
Deal found 5/10![Frontier logo]()
$155
This Southwest deal was found by Cheapflights users on 5/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/38:45 am
BOI
- MDW
Nonstop3h 20m
Southwest
Deal found 5/8![Southwest logo]()
$158
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 May 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $239 (Mytrip) |
One-way from | $105 (Priceline) |
Popular in | March |
Cheapest in | February |
Average price | $432 |
Good round-trip deal | $437 or less |
Good one-way deal | $255 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 May 11, 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 - ORD
BOIORD
Boise Air Term. Gowen Fld
Wed 8/19
4:17 pm-11:59 pm
1 stop6h 42m
Chicago O'Hare Intl
Sat 8/22
6:00 am-12:35 pm
1 stop7h 35m
$330
BoiseMoline
BOI - MLI
BOIMLI
Boise Air Term. Gowen Fld
Tue 6/2
10:41 am-11:14 pm
2 stops11h 33m
Moline Quad-City
Fri 7/3
6:30 am-11:32 am
1 stop6h 02m
$334
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Wed 6/17
5:46 pm-12:44 am
1 stop5h 58m
Chicago O'Hare Intl
Tue 6/23
5:00 am-9:45 am
1 stop5h 45m
$335
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Thu 10/1
2:16 pm-11:59 pm
1 stop8h 43m
Chicago O'Hare Intl
Tue 10/6
6:00 am-12:35 pm
1 stop7h 35m
$335
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Tue 6/23
11:30 am-9:20 pm
1 stop8h 50m
Chicago Midway
Wed 7/1
4:35 pm-12:25 am
2 stops8h 50m
$350
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Tue 6/23
6:00 am-4:16 pm
2 stops9h 16m
Chicago Midway
Tue 6/30
9:54 am-4:52 pm
2 stops7h 58m
$355
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Wed 7/8
5:30 am-1:09 pm
1 stop6h 39m
Chicago Midway
Tue 7/14
1:18 pm-10:04 pm
2 stops9h 46m
$360
BoiseChicago
BOI - ORD
BOIORD
Boise Air Term. Gowen Fld
Wed 7/8
6:00 am-11:59 am
1 stop4h 59m
Chicago O'Hare Intl
Tue 7/14
3:55 pm-12:05 am
2 stops9h 10m
$360
BoisePeoria
BOI - PIA
BOIPIA
Boise Air Term. Gowen Fld
Tue 6/16
3:12 pm-11:34 pm
1 stop7h 22m
Greater Peoria
Tue 7/21
4:43 pm-11:22 pm
1 stop7h 39m
$364
BoiseChicago
BOI - MDW
BOIMDW
Boise Air Term. Gowen Fld
Mon 6/29
5:30 am-1:09 pm
1 stop6h 39m
Chicago Midway
Fri 7/3
1:49 pm-8:55 pm
1 stop8h 06m
$365
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-ORD
BOI-MLI
BOI-MDW
BOI-PIA
BOI-STL
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-MLI
BOI-MDW
BOI-PIA
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 57 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
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 March is currently the most expensive (average of $268). 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 May 11, 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 at noon, which can drop the price by up to 39% 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 May 11, 2026.
The most flights from BOI to USIL are scheduled on a Monday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (10 on average).
How much does it cost to fly round-trip from Boise to Illinois?
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 May 11, 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
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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 May 11, 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 May 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$109 | Average$337 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$233 | Average$385 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$239 | Average$543 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$260 | Average$374 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$268 | Average$439 | FlexibilityNo cancel fee | On-time71% |