$153+ 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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
BIL — ORD
Aug 7 — Aug 141
Round-trip
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 July 8, 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 July 8, 2026.
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Sat 8/224:35 pm
BIL
- ORD
Nonstop3h 05m
United Airlines
Wed 8/265:00 am
ORD
- BIL
1 stop5h 41m
United Airlines
Deal found 7/6![United Airlines logo]()
$261
This Delta deal was found by Cheapflights users on 7/5. 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.
Wed 8/195:20 am
BIL
- ORD
1 stop5h 39m
Delta
Wed 8/266:45 pm
ORD
- BIL
1 stop5h 45m
Delta
Deal found 7/5![Delta logo]()
$271
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- MDW
2 stops12h 13m
Delta
Sat 8/221:51 pm
MDW
- BIL
1 stop7h 21m
Delta
Deal found 7/7![Delta logo]()
$276
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- ORD
1 stop5h 39m
Delta
Wed 8/191:59 pm
ORD
- BIL
2 stops10h 31m
Delta
Deal found 7/7![Delta logo]()
$276
This United Airlines deal was found by Cheapflights users on 7/7. 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 8/184:40 pm
BIL
- ORD
1 stop6h 19m
United Airlines
Sat 8/225:00 am
ORD
- BIL
1 stop5h 41m
United Airlines
Deal found 7/7![United Airlines logo]()
$286
This American Airlines deal was found by Cheapflights users on 7/6. 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.
Wed 9/2312:28 pm
BIL
- ORD
Nonstop3h 02m
American Airlines
Wed 9/309:41 am
ORD
- BIL
Nonstop3h 16m
American Airlines
Deal found 7/6![American Airlines logo]()
$299
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- ORD
1 stop5h 39m
Delta
Sat 8/223:00 pm
ORD
- BIL
1 stop6h 12m
Delta
Deal found 7/7![Delta logo]()
$302
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- MDW
2 stops12h 13m
Delta
Mon 8/177:25 pm
MDW
- BIL
1 stop5h 05m
Delta
Deal found 7/7![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 7/5. 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.
Sat 9/266:20 am
BIL
- ORD
1 stop4h 19m
Delta
Thu 10/11:55 pm
ORD
- BIL
2 stops10h 20m
Delta
Deal found 7/5![Delta logo]()
$307
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Thu 8/2712:22 pm
BIL
- ORD
Nonstop3h 01m
American Airlines
Mon 8/319:40 am
ORD
- BIL
Nonstop3h 10m
American Airlines
Deal found 7/7![American Airlines logo]()
$313
This American Airlines deal was found by Cheapflights users on 7/6. 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.
Thu 8/2712:22 pm
BIL
- ORD
Nonstop3h 01m
American Airlines
Sun 8/309:40 am
ORD
- BIL
Nonstop3h 10m
American Airlines
Deal found 7/6![American Airlines logo]()
$314
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Sat 8/2210:37 am
BIL
- ORD
Nonstop3h 01m
American Airlines
Sat 8/299:40 am
ORD
- BIL
Nonstop3h 10m
American Airlines
Deal found 7/7![American Airlines logo]()
$328
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 July 8, 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 July 8, 2026.
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Sat 8/224:35 pm
BIL
- ORD
Nonstop3h 05m
United Airlines
Wed 8/265:00 am
ORD
- BIL
1 stop5h 41m
United Airlines
Deal found 7/6![United Airlines logo]()
$261
This Delta deal was found by Cheapflights users on 7/6. 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.
Wed 9/235:30 am
BIL
- ORD
1 stop5h 25m
Delta
Wed 9/3012:29 pm
ORD
- BIL
2 stops11h 05m
Delta
Deal found 7/6![Delta logo]()
$276
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Sun 8/307:00 am
BIL
- STL
1 stop6h 45m
American Airlines
Wed 9/26:00 am
STL
- BIL
1 stop6h 50m
American Airlines
Deal found 7/7![American Airlines logo]()
$495
This Alaska Airlines deal was found by Cheapflights users on 7/7. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1111:55 am
BIL
- ORD
1 stop11h 02m
Alaska Airlines
Thu 11/128:10 am
ORD
- BIL
2 stops15h 33m
Alaska Airlines
Deal found 7/7![Alaska Airlines logo]()
$505
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Wed 8/194:40 pm
BIL
- ORD
1 stop6h 19m
United Airlines
Wed 8/265:00 am
ORD
- BIL
1 stop5h 41m
United Airlines
Deal found 7/3![United Airlines logo]()
$271
This Delta deal was found by Cheapflights users on 7/3. 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 8/196:26 am
BIL
- MDW
1 stop5h 44m
Delta
Wed 8/267:25 pm
MDW
- BIL
1 stop5h 05m
Delta
Deal found 7/3![Delta logo]()
$359
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Sat 11/74:00 pm
BIL
- ORD
1 stop6h 57m
United Airlines
Wed 11/1112:45 pm
ORD
- BIL
1 stop5h 19m
United Airlines
Deal found 7/7![United Airlines logo]()
$361
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Wed 7/226:00 pm
BIL
- STL
1 stop4h 57m
United Airlines
Sun 7/265:10 am
STL
- BIL
1 stop5h 26m
United Airlines
Deal found 7/7![United Airlines logo]()
$404
This United Airlines deal was found by Cheapflights users on 7/6. 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 10/272:29 pm
BIL
- MLI
2 stops7h 32m
United Airlines
Sat 10/316:30 am
MLI
- BIL
2 stops7h 48m
United Airlines
Deal found 7/6![United Airlines logo]()
$409
This Delta deal was found by Cheapflights users on 7/7. 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.
Sat 7/185:20 am
BIL
- MDW
2 stops11h 47m
Delta
Sat 7/251:49 pm
MDW
- BIL
1 stop7h 10m
Delta
Deal found 7/7![Delta logo]()
$498
This Delta deal was found by Cheapflights users on 7/7. 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.
Sat 8/226:26 am
BIL
- MDW
1 stop5h 44m
Delta
Sat 8/291:25 pm
MDW
- BIL
2 stops10h 28m
Delta
Deal found 7/7![Delta logo]()
$502
This United Airlines deal was found by Cheapflights users on 7/5. 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 7/214:10 pm
BIL
- STL
1 stop6h 47m
United Airlines
Sat 7/254:45 pm
STL
- BIL
1 stop7h 09m
United Airlines
Deal found 7/5![United Airlines logo]()
$442
This Delta deal was found by Cheapflights users on 7/7. 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 11/115:45 am
BIL
- MDW
2 stops11h 52m
Delta
Thu 11/129:30 am
MDW
- BIL
2 stops9h 19m
Delta
Deal found 7/7![Delta logo]()
$514
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Tue 7/286:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Sat 8/15:00 am
ORD
- BIL
1 stop5h 35m
United Airlines
Deal found 7/3![United Airlines logo]()
$457
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Mon 8/34:10 pm
BIL
- ORD
1 stop6h 09m
United Airlines
Mon 8/105:00 am
ORD
- BIL
1 stop5h 36m
United Airlines
Deal found 7/3![United Airlines logo]()
$474
This American Airlines deal was found by Cheapflights users on 7/7. 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 7/2812:49 pm
BIL
- EVV
1 stop10h 10m
American Airlines
Tue 8/45:19 am
EVV
- BIL
1 stop8h 40m
American Airlines
Deal found 7/7![American Airlines logo]()
$868
This Delta deal was found by Cheapflights users on 7/3. 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 7/226:24 am
BIL
- MDW
1 stop5h 45m
Delta
Wed 7/297:06 pm
MDW
- BIL
1 stop5h 24m
Delta
Deal found 7/3![Delta logo]()
$613
This United Airlines deal was found by Cheapflights users on 7/5. 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 7/216:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Thu 7/305:00 am
ORD
- BIL
1 stop5h 36m
United Airlines
Deal found 7/5![United Airlines logo]()
$491
This Delta deal was found by Cheapflights users on 7/8. 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.
Sat 8/16:24 am
BIL
- MDW
1 stop5h 45m
Delta
Tue 8/41:25 pm
MDW
- BIL
2 stops10h 00m
Delta
Deal found 7/8![Delta logo]()
$621
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Wed 7/226:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Thu 7/305:00 am
ORD
- BIL
1 stop5h 36m
United Airlines
Deal found 7/6![United Airlines logo]()
$493
This Delta deal was found by Cheapflights users on 7/7. 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.
Sun 8/166:26 am
BIL
- MDW
1 stop5h 44m
Delta
Thu 8/207:25 pm
MDW
- BIL
1 stop5h 05m
Delta
Deal found 7/7![Delta logo]()
$717
This United Airlines deal was found by Cheapflights users on 7/5. 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.
Sat 8/16:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Tue 8/45:00 am
ORD
- BIL
1 stop5h 36m
United Airlines
Deal found 7/5![United Airlines logo]()
$557
This Delta deal was found by Cheapflights users on 7/3. 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.
Mon 8/36:26 am
BIL
- MDW
1 stop5h 44m
Delta
Mon 8/107:25 pm
MDW
- BIL
1 stop5h 05m
Delta
Deal found 7/3![Delta logo]()
$741
This Delta deal was found by Cheapflights users on 7/7. 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.
Tue 7/286:34 pm
BIL
- EVV
2 stops13h 52m
Delta
Tue 8/41:42 pm
EVV
- BIL
2 stops9h 43m
Delta
Deal found 7/7![Delta logo]()
$798
This Delta deal was found by Cheapflights users on 7/5. 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.
Tue 7/216:34 pm
BIL
- STL
2 stops12h 45m
Delta
Sat 7/258:00 am
STL
- BIL
2 stops10h 52m
Delta
Deal found 7/5![Delta logo]()
$822
This United Airlines deal was found by Cheapflights users on 7/5. 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.
Mon 7/206:00 pm
BIL
- MLI
1 stop25h 54m
United Airlines
Fri 7/241:15 pm
MLI
- BIL
2 stops21h 20m
United Airlines
Deal found 7/5![United Airlines logo]()
$751
This Delta deal was found by Cheapflights users on 7/7. 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 7/225:20 am
BIL
- STL
2 stops11h 33m
Delta
Sun 7/261:54 pm
STL
- BIL
2 stops9h 56m
Delta
Deal found 7/7![Delta logo]()
$937
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Wed 12/162:40 pm
BIL
- MLI
2 stops8h 34m
United Airlines
Sat 12/198:50 am
MLI
- BIL
1 stop26h 01m
United Airlines
Deal found 7/7![United Airlines logo]()
$938
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Sun 7/192:25 pm
BIL
- MLI
1 stop5h 29m
United Airlines
Thu 7/239:05 am
MLI
- BIL
1 stop7h 24m
United Airlines
Deal found 7/3![United Airlines logo]()
$939
Last-minute flights from Billings to IllinoisDiscover last-minute flight deals from Billings to Illinois. Data last updated July 8, 2026 and is based on user searches.
Discover last-minute flight deals from Billings to Illinois. Data last updated July 8, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- MDW
2 stops12h 13m
Delta
Sat 8/221:51 pm
MDW
- BIL
1 stop7h 21m
Delta
Deal found 7/7![Delta logo]()
$276
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- ORD
1 stop5h 39m
Delta
Wed 8/191:59 pm
ORD
- BIL
2 stops10h 31m
Delta
Deal found 7/7![Delta logo]()
$276
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- ORD
1 stop5h 39m
Delta
Sat 8/223:00 pm
ORD
- BIL
1 stop6h 12m
Delta
Deal found 7/7![Delta logo]()
$302
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- MDW
2 stops12h 13m
Delta
Mon 8/177:25 pm
MDW
- BIL
1 stop5h 05m
Delta
Deal found 7/7![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 7/7. 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 8/125:20 am
BIL
- ORD
1 stop5h 39m
Delta
Fri 8/211:59 pm
ORD
- BIL
2 stops10h 31m
Delta
Deal found 7/7![Delta logo]()
$307
This Delta deal was found by Cheapflights users on 7/7. 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.
Sun 8/165:20 am
BIL
- ORD
1 stop5h 39m
Delta
Sat 8/223:00 pm
ORD
- BIL
1 stop6h 12m
Delta
Deal found 7/7![Delta logo]()
$333
This United Airlines deal was found by Cheapflights users on 7/7. 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 8/184:40 pm
BIL
- ORD
1 stop6h 19m
United Airlines
Sat 8/225:00 am
ORD
- BIL
1 stop5h 41m
United Airlines
Deal found 7/7![United Airlines logo]()
$286
This Delta deal was found by Cheapflights users on 7/5. 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.
Wed 8/195:20 am
BIL
- ORD
1 stop5h 39m
Delta
Wed 8/266:45 pm
ORD
- BIL
1 stop5h 45m
Delta
Deal found 7/5![Delta logo]()
$271
This United Airlines deal was found by Cheapflights users on 7/6. 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.
Sat 8/224:35 pm
BIL
- ORD
Nonstop3h 05m
United Airlines
Wed 8/265:00 am
ORD
- BIL
1 stop5h 41m
United Airlines
Deal found 7/6![United Airlines logo]()
$261
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Sat 8/2210:37 am
BIL
- ORD
Nonstop3h 01m
American Airlines
Sat 8/299:40 am
ORD
- BIL
Nonstop3h 10m
American Airlines
Deal found 7/7![American Airlines logo]()
$328
This American Airlines deal was found by Cheapflights users on 7/7. 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.
Thu 8/2712:22 pm
BIL
- ORD
Nonstop3h 01m
American Airlines
Mon 8/319:40 am
ORD
- BIL
Nonstop3h 10m
American Airlines
Deal found 7/7![American Airlines logo]()
$313
This American Airlines deal was found by Cheapflights users on 7/6. 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.
Thu 8/2712:22 pm
BIL
- ORD
Nonstop3h 01m
American Airlines
Sun 8/309:40 am
ORD
- BIL
Nonstop3h 10m
American Airlines
Deal found 7/6![American Airlines logo]()
$314
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 July 8, 2026.
Search for one-way flight options from Billings to Illinois. Find affordable one-way fares based on user searches. Data last updated July 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/8. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/78:53 pm
BIL
- ORD
2 stops15h 43m
Multiple Airlines
Deal found 7/8![Multiple Airlines logo]()
$153
This United Airlines deal was found by Cheapflights users on 7/7. 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.
Sat 8/86:00 pm
BIL
- ORD
1 stop5h 44m
United Airlines
Deal found 7/7![United Airlines logo]()
$167
This Kiwi.com deal was found by Cheapflights users on 7/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/285:22 pm
BIL
- ORD
1 stop11h 20m
Multiple Airlines
Deal found 7/3![Multiple Airlines logo]()
$171
This American Airlines deal was found by Cheapflights users on 7/7. 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 9/812:22 pm
BIL
- ORD
Nonstop3h 01m
American Airlines
Deal found 7/7![American Airlines logo]()
$172
This Kiwi.com deal was found by Cheapflights users on 7/7. 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.
Mon 10/510:20 pm
BIL
- ORD
1 stop30h 22m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$174
This Kiwi.com deal was found by Cheapflights users on 7/5. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/39:59 am
BIL
- ORD
1 stop18h 38m
Multiple Airlines
Deal found 7/5![Multiple Airlines logo]()
$211
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Tue 9/82:29 pm
BIL
- ORD
1 stop7h 17m
United Airlines
Deal found 7/3![United Airlines logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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 8/319:57 pm
BIL
- ORD
2 stops14h 39m
Multiple Airlines
Deal found 7/4![Multiple Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 7/3. 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 9/86:20 am
BIL
- MDW
1 stop6h 00m
Delta
Deal found 7/3![Delta logo]()
$224
This Delta deal was found by Cheapflights users on 7/6. 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.
Wed 8/195:20 am
BIL
- MDW
2 stops9h 55m
Delta
Deal found 7/6![Delta logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 7/7. 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.
Mon 8/39:59 am
BIL
- MDW
2 stops35h 04m
Multiple Airlines
Deal found 7/7![Multiple Airlines logo]()
$246
This Kiwi.com deal was found by Cheapflights users on 7/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:45 pm
BIL
- STL
3 stops46h 37m
Multiple Airlines
Deal found 7/3![Multiple Airlines logo]()
$249
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 July 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $261 (United Airlines) |
One-way from | $153 (Kiwi.com) |
Popular in | July |
Cheapest in | January |
Average price | $655 |
Good round-trip deal | $348 or less |
Good one-way deal | $370 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 July 8, 2026.
Use the filters below to find and compare flights from Billings to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Sat 8/22
4:35 pm-8:40 pm
Nonstop3h 05m
Chicago O'Hare Intl
Wed 8/26
5:00 am-9:41 am
1 stop5h 41m
$261
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Wed 8/19
4:40 pm-11:59 pm
1 stop6h 19m
Chicago O'Hare Intl
Wed 8/26
5:00 am-9:41 am
1 stop5h 41m
$271
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Wed 9/23
5:30 am-11:55 am
1 stop5h 25m
Chicago O'Hare Intl
Wed 9/30
12:29 pm-10:34 pm
2 stops11h 05m
$276
BillingsChicago
BIL - MDW
BILMDW
Billings Logan Intl
Wed 8/19
6:26 am-1:10 pm
1 stop5h 44m
Chicago Midway
Wed 8/26
7:25 pm-11:30 pm
1 stop5h 05m
$359
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Sat 11/7
4:00 pm-11:57 pm
1 stop6h 57m
Chicago O'Hare Intl
Wed 11/11
12:45 pm-5:04 pm
1 stop5h 19m
$361
BillingsSt. Louis
BIL - STL
BILSTL
Billings Logan Intl
Wed 7/22
6:00 pm-11:57 pm
1 stop4h 57m
Lambert-St Louis
Sun 7/26
5:10 am-9:36 am
1 stop5h 26m
$404
BillingsMoline
BIL - MLI
BILMLI
Billings Logan Intl
Tue 10/27
2:29 pm-11:01 pm
2 stops7h 32m
Moline Quad-City
Sat 10/31
6:30 am-1:18 pm
2 stops7h 48m
$409
BillingsSt. Louis
BIL - STL
BILSTL
Billings Logan Intl
Tue 7/21
4:10 pm-11:57 pm
1 stop6h 47m
Lambert-St Louis
Sat 7/25
4:45 pm-10:54 pm
1 stop7h 09m
$442
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Tue 7/28
6:00 pm-12:44 am
1 stop5h 44m
Chicago O'Hare Intl
Sat 8/1
5:00 am-9:35 am
1 stop5h 35m
$457
BillingsChicago
BIL - ORD
BILORD
Billings Logan Intl
Mon 8/3
4:10 pm-11:19 pm
1 stop6h 09m
Chicago O'Hare Intl
Mon 8/10
5:00 am-9:36 am
1 stop5h 36m
$474
Showing 1-10 of 58 resultsSorted by cheapest first
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-ORD
BIL-MDW
BIL-STL
BIL-MLI
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-ORD
BIL-MDW
BIL-STL
BIL-MLI
What is the cheapest month to book a flight from Billings to Illinois?
Currently, March is the cheapest month in which you can book a flight from Billings to Illinois (average of $210). Flying from Billings to Illinois in June is currently the most expensive (average of $319). 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 BIL to IL?
Find hourly flight availability from Billings 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 July 8, 2026.
When flying from Billings to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Weekly flight availability from Billings to Illinois
Explore weekly flight availability from Billings 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 July 8, 2026.
The most flights from BIL to USIL are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from Billings 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 July 8, 2026.
See what other customers who have flown with Delta,United Airlines, andAmerican 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.
Boarding
8.1
Entertainment
7.8
Overall
7.8
Food
7.2
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.8
Food
7.2
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.8
Food
7.2
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Entertainment
7.8
Overall
7.8
Food
7.2
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
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
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Billings to Illinois
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Billings to Illinois by cabin class
Find flights from Billings to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Billings and Illinois flights
Browse other Billings and Illinois flight options. Last updated on July 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Billings to Illinois flights
Consider these flights traveling from Billings to Illinois.
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 July 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$210 | Average$492 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$229 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$249 | Average$399 | FlexibilityNo cancel fee | On-time69% |