$150+ Cheap flights from Billings (BIL) 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 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
BIL — ORD
Mar 1 — Mar 81
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Billings to Illinois with Cheapflights
1. Tell us where you want to go
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Billings to Illinois
Cheapest
Best
Last-minute
One-way
Cheapest flights from Billings to IllinoisExplore the most affordable flight options available from Billings to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2026.
Explore the most affordable flight options available from Billings to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2026.
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:20 am
BIL
- MDW
1 stop5h 45m
Delta
Mon 2/231:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/29![Delta logo]()
$249
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:10 am
BIL
- ORD
1 stop6h 09m
Delta
Mon 2/233:59 pm
ORD
- BIL
1 stop4h 40m
Delta
Deal found 1/29![Delta logo]()
$249
This American Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am
BIL
- ORD
Nonstop2h 51m
American Airlines
Mon 8/318:46 pm
ORD
- BIL
Nonstop3h 13m
American Airlines
Deal found 1/29![American Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:10 am
BIL
- MDW
2 stops11h 27m
Delta
Mon 2/231:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/28![Delta logo]()
$254
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/85:45 am
BIL
- ORD
1 stop5h 36m
Delta
Sun 5/103:50 pm
ORD
- BIL
1 stop7h 47m
Delta
Deal found 1/29![Delta logo]()
$270
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:45 am
BIL
- ORD
1 stop5h 36m
Delta
Wed 5/135:20 pm
ORD
- BIL
1 stop6h 17m
Delta
Deal found 1/28![Delta logo]()
$274
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:10 am
BIL
- STL
1 stop7h 22m
Delta
Tue 3/103:05 pm
STL
- BIL
1 stop6h 14m
Delta
Deal found 1/28![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/132:35 pm
BIL
- ORD
1 stop7h 17m
United Airlines
Tue 2/177:10 am
ORD
- BIL
1 stop7h 13m
United Airlines
Deal found 1/29![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:10 am
BIL
- ORD
1 stop6h 09m
Delta
Mon 2/233:59 pm
ORD
- BIL
1 stop4h 40m
Delta
Deal found 1/28![Delta logo]()
$304
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:45 am
BIL
- ORD
1 stop5h 36m
Delta
Mon 8/311:35 pm
ORD
- BIL
2 stops10h 02m
Delta
Deal found 1/28![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:55 pm
BIL
- ORD
1 stop5h 49m
United Airlines
Mon 6/87:52 pm
ORD
- BIL
Nonstop3h 21m
United Airlines
Deal found 1/27![United Airlines logo]()
$314
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/136:20 am
BIL
- MDW
1 stop5h 45m
Delta
Tue 2/171:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/29![Delta logo]()
$329
Best flights from Billings to IllinoisDiscover carefully curated flight deals from Billings to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 30, 2026.
Discover carefully curated flight deals from Billings to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 30, 2026.
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:20 am
BIL
- MDW
1 stop5h 45m
Delta
Mon 2/231:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/29![Delta logo]()
$249
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/132:35 pm
BIL
- ORD
1 stop7h 17m
United Airlines
Tue 2/177:10 am
ORD
- BIL
1 stop7h 13m
United Airlines
Deal found 1/29![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:10 am
BIL
- MDW
2 stops11h 27m
Delta
Mon 2/231:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/28![Delta logo]()
$254
This Alaska Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/187:21 pm
BIL
- STL
2 stops20h 45m
Alaska Airlines
Thu 5/287:56 pm
STL
- BIL
2 stops19h 58m
Alaska Airlines
Deal found 1/28![Alaska Airlines logo]()
$523
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:45 am
BIL
- ORD
1 stop5h 36m
Delta
Wed 5/135:20 pm
ORD
- BIL
1 stop6h 17m
Delta
Deal found 1/28![Delta logo]()
$274
This American Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/212:36 pm
BIL
- EVV
1 stop10h 20m
American Airlines
Tue 7/75:30 pm
EVV
- BIL
1 stop6h 15m
American Airlines
Deal found 1/28![American Airlines logo]()
$611
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:55 pm
BIL
- ORD
1 stop5h 49m
United Airlines
Mon 6/87:52 pm
ORD
- BIL
Nonstop3h 21m
United Airlines
Deal found 1/27![United Airlines logo]()
$314
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:10 am
BIL
- ORD
1 stop6h 09m
Delta
Mon 2/232:05 pm
ORD
- BIL
2 stops9h 21m
Delta
Deal found 1/29![Delta logo]()
$275
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/125:55 pm
BIL
- ORD
1 stop5h 49m
United Airlines
Sun 6/147:52 pm
ORD
- BIL
Nonstop3h 21m
United Airlines
Deal found 1/29![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:10 am
BIL
- STL
1 stop7h 22m
Delta
Tue 3/103:05 pm
STL
- BIL
1 stop6h 14m
Delta
Deal found 1/28![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/172:30 pm
BIL
- STL
1 stop5h 12m
United Airlines
Tue 6/234:50 pm
STL
- BIL
1 stop5h 19m
United Airlines
Deal found 1/28![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:10 am
BIL
- ORD
1 stop6h 09m
Delta
Mon 2/233:59 pm
ORD
- BIL
1 stop4h 40m
Delta
Deal found 1/28![Delta logo]()
$304
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/147:00 am
BIL
- ORD
1 stop6h 50m
United Airlines
Tue 2/177:10 am
ORD
- BIL
1 stop7h 13m
United Airlines
Deal found 1/28![United Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/136:20 am
BIL
- MDW
1 stop5h 45m
Delta
Tue 2/171:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/29![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/165:55 pm
BIL
- STL
1 stop5h 03m
United Airlines
Wed 6/245:15 am
STL
- BIL
1 stop5h 24m
United Airlines
Deal found 1/28![United Airlines logo]()
$386
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:00 am
BIL
- STL
2 stops15h 59m
United Airlines
Tue 3/107:40 am
STL
- BIL
2 stops30h 43m
United Airlines
Deal found 1/28![United Airlines logo]()
$407
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/185:45 am
BIL
- STL
1 stop6h 36m
Delta
Thu 5/282:18 pm
STL
- BIL
2 stops9h 09m
Delta
Deal found 1/28![Delta logo]()
$383
This Delta deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/36:25 am
BIL
- MDW
1 stop6h 00m
Delta
Mon 4/62:05 pm
MDW
- BIL
1 stop7h 14m
Delta
Deal found 1/27![Delta logo]()
$384
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/172:30 pm
BIL
- STL
1 stop5h 12m
United Airlines
Wed 6/244:50 pm
STL
- BIL
1 stop5h 19m
United Airlines
Deal found 1/28![United Airlines logo]()
$423
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/96:15 am
BIL
- MDW
1 stop5h 52m
Delta
Wed 5/136:45 pm
MDW
- BIL
1 stop4h 52m
Delta
Deal found 1/28![Delta logo]()
$394
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/182:30 pm
BIL
- STL
1 stop5h 13m
United Airlines
Thu 5/285:15 am
STL
- BIL
1 stop5h 24m
United Airlines
Deal found 1/28![United Airlines logo]()
$475
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:15 am
BIL
- MDW
1 stop5h 52m
Delta
Sun 5/106:45 pm
MDW
- BIL
1 stop4h 52m
Delta
Deal found 1/29![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/155:55 pm
BIL
- STL
1 stop5h 03m
United Airlines
Tue 6/234:50 pm
STL
- BIL
1 stop5h 19m
United Airlines
Deal found 1/28![United Airlines logo]()
$475
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/232:35 pm
BIL
- STL
1 stop5h 19m
United Airlines
Sun 4/269:10 am
STL
- BIL
2 stops12h 47m
United Airlines
Deal found 1/28![United Airlines logo]()
$518
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/126:25 pm
BIL
- STL
1 stop5h 00m
Delta
Mon 2/166:10 am
STL
- BIL
2 stops12h 17m
Delta
Deal found 1/28![Delta logo]()
$500
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/26:25 pm
BIL
- EVV
2 stops14h 01m
Delta
Tue 7/710:05 am
EVV
- BIL
2 stops13h 22m
Delta
Deal found 1/29![Delta logo]()
$674
Last-minute flights from Billings to IllinoisDiscover last-minute flight deals from Billings to Illinois. Data last updated January 30, 2026 and is based on user searches.
Discover last-minute flight deals from Billings to Illinois. Data last updated January 30, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/32:45 pm
BIL
- STL
1 stop5h 13m
United Airlines
Sat 2/74:15 pm
STL
- BIL
1 stop6h 08m
United Airlines
Deal found 1/27![United Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/126:25 pm
BIL
- STL
1 stop5h 00m
Delta
Mon 2/163:40 pm
STL
- BIL
1 stop4h 59m
Delta
Deal found 1/28![Delta logo]()
$384
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/126:20 am
BIL
- ORD
1 stop4h 25m
Delta
Sun 2/156:45 am
ORD
- BIL
2 stops13h 54m
Delta
Deal found 1/29![Delta logo]()
$424
This United Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/132:35 pm
BIL
- ORD
1 stop7h 17m
United Airlines
Tue 2/177:10 am
ORD
- BIL
1 stop7h 13m
United Airlines
Deal found 1/29![United Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/136:20 am
BIL
- MDW
1 stop5h 45m
Delta
Tue 2/171:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/29![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/147:00 am
BIL
- ORD
1 stop6h 50m
United Airlines
Tue 2/177:10 am
ORD
- BIL
1 stop7h 13m
United Airlines
Deal found 1/28![United Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:10 am
BIL
- MDW
2 stops11h 27m
Delta
Mon 2/231:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/28![Delta logo]()
$254
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/185:10 am
BIL
- ORD
1 stop6h 09m
Delta
Mon 2/233:59 pm
ORD
- BIL
1 stop4h 40m
Delta
Deal found 1/28![Delta logo]()
$304
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/196:20 am
BIL
- MDW
1 stop5h 45m
Delta
Mon 2/231:49 pm
MDW
- BIL
1 stop6h 50m
Delta
Deal found 1/29![Delta logo]()
$249
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:10 am
BIL
- ORD
1 stop6h 09m
Delta
Mon 2/233:59 pm
ORD
- BIL
1 stop4h 40m
Delta
Deal found 1/29![Delta logo]()
$249
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/285:10 am
BIL
- STL
1 stop7h 22m
Delta
Tue 3/103:05 pm
STL
- BIL
1 stop6h 14m
Delta
Deal found 1/28![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:00 am
BIL
- STL
2 stops15h 59m
United Airlines
Tue 3/107:40 am
STL
- BIL
2 stops30h 43m
United Airlines
Deal found 1/28![United Airlines logo]()
$407
One-way flights from Billings to IllinoisSearch for one-way flight options from Billings to Illinois. Find affordable one-way fares based on user searches. Data last updated January 30, 2026.
Search for one-way flight options from Billings to Illinois. Find affordable one-way fares based on user searches. Data last updated January 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/282:04 pm
BIL
- ORD
1 stop8h 52m
Alaska Airlines
Deal found 1/29![Alaska Airlines logo]()
$150
This Kiwi.com deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/910:39 am
BIL
- ORD
2 stops53h 24m
Multiple Airlines
Deal found 1/28![Multiple Airlines logo]()
$154
This Alaska Airlines deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/22:04 pm
BIL
- ORD
1 stop8h 52m
Alaska Airlines
Deal found 1/29![Alaska Airlines logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2710:34 am
BIL
- ORD
1 stop19h 13m
Multiple Airlines
Deal found 1/27![Multiple Airlines logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1310:34 am
BIL
- ORD
1 stop19h 13m
Multiple Airlines
Deal found 1/29![Multiple Airlines logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2710:22 am
BIL
- STL
1 stop30h 24m
Multiple Airlines
Deal found 1/29![Multiple Airlines logo]()
$175
This Delta deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/266:20 am
BIL
- MDW
1 stop5h 45m
Delta
Deal found 1/28![Delta logo]()
$186
This Delta deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/256:20 am
BIL
- ORD
1 stop4h 25m
Delta
Deal found 1/29![Delta logo]()
$186
This Alaska Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/302:05 pm
BIL
- ORD
1 stop15h 34m
Alaska Airlines
Deal found 1/28![Alaska Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 1/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/210:22 am
BIL
- ORD
2 stops29h 30m
Multiple Airlines
Deal found 1/29![Multiple Airlines logo]()
$188
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:35 pm
BIL
- STL
1 stop5h 06m
United Airlines
Deal found 1/28![United Airlines logo]()
$193
This United Airlines deal was found by Cheapflights users on 1/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/102:35 pm
BIL
- STL
1 stop5h 06m
United Airlines
Deal found 1/28![United Airlines logo]()
$216
Find flight deals from Billings to Illinois
Keep the following information in mind while searching for Billings to Illinois flight deals. Data was last updated January 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $249 (Delta) |
One-way from | $150 (Alaska Airlines) |
Popular in | November |
Cheapest in | January |
Average price | $253 |
Good round-trip deal | $605 or less |
Good one-way deal | $238 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Billings 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 January 30, 2026.
Use the filters below to find and compare flights from Billings to Illinois that are best for you.
Fly from
Billings
Fly to
Illinois
Route
Depart
Return
Price
BillingsChicago
BIL - MDW
BILMDW
Billings Logan Intl
Thu 2/19
6:20 am-1:05 pm
1 stop5h 45m
Chicago Midway
Mon 2/23
1:49 pm-7:39 pm
1 stop6h 50m
$249
BillingsChicago
BIL - MDW
BILMDW
Billings Logan Intl
Wed 2/18
5:10 am-5:37 pm
2 stops11h 27m
Chicago Midway
Mon 2/23
1:49 pm-7:39 pm
1 stop6h 50m
$254
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Sat 5/9
5:45 am-12:21 pm
1 stop5h 36m
Chicago O'Hare Intl
Wed 5/13
5:20 pm-10:37 pm
1 stop6h 17m
$274
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Thu 2/19
5:10 am-12:19 pm
1 stop6h 09m
Chicago O'Hare Intl
Mon 2/23
2:05 pm-10:26 pm
2 stops9h 21m
$275
BillingsSt. Louis
BIL - STL
BILSTL
Billings Logan Intl
Sat 2/28
5:10 am-1:32 pm
1 stop7h 22m
Lambert-St Louis
Tue 3/10
3:05 pm-8:19 pm
1 stop6h 14m
$279
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Fri 2/13
2:35 pm-10:52 pm
1 stop7h 17m
Chicago O'Hare Intl
Tue 2/17
7:10 am-1:23 pm
1 stop7h 13m
$299
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Wed 2/18
5:10 am-12:19 pm
1 stop6h 09m
Chicago O'Hare Intl
Mon 2/23
3:59 pm-7:39 pm
1 stop4h 40m
$304
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Fri 6/5
5:55 pm-12:44 am
1 stop5h 49m
Chicago O'Hare Intl
Mon 6/8
7:52 pm-10:13 pm
Nonstop3h 21m
$314
BillingsChicago
BIL - MDW
BILMDW
Billings Logan Intl
Fri 2/13
6:20 am-1:05 pm
1 stop5h 45m
Chicago Midway
Tue 2/17
1:49 pm-7:39 pm
1 stop6h 50m
$329
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Fri 6/12
5:55 pm-12:44 am
1 stop5h 49m
Chicago O'Hare Intl
Sun 6/14
7:52 pm-10:13 pm
Nonstop3h 21m
$337
Showing 1-10 of 55 results
Best time to book a flight from Billings to Illinois
Have a flexible travel schedule? Discover the best time to fly to Illinois from Billings with our price prediction graph.
BIL-MDW
BIL-ORD
BIL-STL
BIL-EVV
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 Billings to Illinois
BIL-USIL
BIL-MDW
BIL-ORD
BIL-STL
BIL-EVV
No data available for this route at this time. Please check back soon.
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 January 30, 2026.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Billings to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Entertainment
7.8
Comfort
7.9
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Related info for your journey
Find useful and relevant information for your journey from Billings to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for Billings to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Top 3 airlines flying from Billings to Illinois
Discover the top 3 airlines that operate flights from Billings 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 January 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$225 | Average$371 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$239 | Average$406 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$248 | Average$447 | FlexibilityNo cancel fee | On-timeN/A |