HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$157+ 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 6/18. Fares are subject to change and may not be available on all flights or dates of travel.
BIL — ORD
May 6 — May 131
Tue 5/6
Tue 5/13
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

Keep the following information in mind while searching for Billings to Illinois flight deals. Data was last updated May 1, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$209
(American Airlines)

One-way from

$157
(Delta)

Popular in

December

Cheapest in

April

Average price

$319

Good round-trip deal

$383 or less

Good one-way deal

$195 or less
Provider with most accurate pricing for Billings Logan Intl-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Billings Logan Intl-Chicago (CHI) flights.
Search Deals
From Billings Logan Intl to Illinois
Search Deals
One-way flight from Billings Logan Intl to Illinois
Search Deals
Highest demand for flights based on searches. 32% potential increase in price ($219 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
Search Deals
Price to beat on a round-trip flight from Billings Logan Intl to Illinois.
Search Deals
Price to beat on a one-way flight from Billings Logan Intl to Illinois.
Search Deals

Find flight deals from Billings to Illinois

Cheapest flights from Billings to Illinois
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 May 1, 2025.

This American Airlines deal was found by Cheapflights users on 4/29. 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.
Sat 8/166:00 amBIL - ORD
Nonstop2h 51mAmerican Airlines
Wed 8/208:46 pmORD - BIL
Nonstop3h 13mAmerican Airlines
Deal found 4/29$209
This Delta deal was found by Cheapflights users on 4/29. 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.
Sat 8/166:25 amBIL - ORD
1 stop7h 34mDelta
Wed 8/201:35 pmORD - BIL
2 stops9h 51mDelta
Deal found 4/29$234
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Thu 8/145:55 pmBIL - ORD
1 stop5h 35mUnited Airlines
Mon 8/189:20 amORD - BIL
Nonstop3h 16mUnited Airlines
Deal found 4/29$299
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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 5/246:23 amBIL - MDW
1 stop5h 52mDelta
Sun 5/257:25 pmMDW - BIL
1 stop4h 33mDelta
Deal found 4/30$309
This United Airlines deal was found by Cheapflights users on 4/28. 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 5/274:16 pmBIL - STL
1 stop6h 43mUnited Airlines
Tue 6/34:32 pmSTL - BIL
1 stop5h 42mUnited Airlines
Deal found 4/28$313
This Delta deal was found by Cheapflights users on 4/28. 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.
Tue 5/276:23 amBIL - STL
2 stops9h 12mDelta
Tue 6/32:15 pmSTL - BIL
2 stops11h 04mDelta
Deal found 4/28$323
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Wed 5/2812:30 pmBIL - MLI
1 stop7h 57mUnited Airlines
Sat 5/3110:55 amMLI - BIL
2 stops12h 02mUnited Airlines
Deal found 4/29$344
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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.
Thu 5/293:45 pmBIL - ORD
1 stop7h 11mAlaska Airlines
Tue 6/310:00 amORD - BIL
1 stop9h 44mAlaska Airlines
Deal found 4/29$345
This Delta deal was found by Cheapflights users on 4/29. 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 5/75:20 amBIL - MLI
2 stops10h 14mDelta
Sat 5/106:00 amMLI - BIL
2 stops12h 17mDelta
Deal found 4/29$379
This Mytrip deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” 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.
Wed 6/1112:20 pmBIL - ORD
1 stop16h 52mMultiple Airlines
Sun 6/229:35 pmORD - BIL
1 stop24h 59mMultiple Airlines
Deal found 4/30$388
This American Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 5/22:02 pmBIL - MLI
1 stop6h 21mAmerican Airlines
Wed 5/73:25 pmMLI - BIL
1 stop7h 37mAmerican Airlines
Deal found 4/29$449
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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.
Wed 5/216:05 amBIL - STL
2 stops15h 59mAlaska Airlines
Thu 5/226:52 amSTL - BIL
2 stops18h 07mAlaska Airlines
Deal found 4/29$724

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 May 1, 2025.
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 - ORD

BILORD

Billings Logan Intl

Sat 8/16

6:00 am-9:51 am

Nonstop2h 51m

Chicago O'Hare Intl

Wed 8/20

8:46 pm-10:59 pm

Nonstop3h 13m

$209

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Sat 8/16

6:25 am-2:59 pm

1 stop7h 34m

Chicago O'Hare Intl

Wed 8/20

1:35 pm-10:26 pm

2 stops9h 51m

$234

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Thu 8/14

12:50 pm-4:45 pm

Nonstop2h 55m

Chicago O'Hare Intl

Sun 8/17

5:00 am-9:38 am

1 stop5h 38m

$299

BillingsChicago

BIL - MDW

BILMDW

Billings Logan Intl

Sat 5/24

6:23 am-1:15 pm

1 stop5h 52m

Chicago Midway

Sun 5/25

7:25 pm-10:58 pm

1 stop4h 33m

$309

BillingsSt. Louis

BIL - STL

BILSTL

Billings Logan Intl

Tue 5/27

4:16 pm-11:59 pm

1 stop6h 43m

Lambert-St Louis

Tue 6/3

4:32 pm-9:14 pm

1 stop5h 42m

$313

BillingsSt. Louis

BIL - STL

BILSTL

Billings Logan Intl

Tue 5/27

6:23 am-4:35 pm

2 stops9h 12m

Lambert-St Louis

Tue 6/3

2:15 pm-12:19 am

2 stops11h 04m

$323

BillingsMoline

BIL - MLI

BILMLI

Billings Logan Intl

Wed 5/28

12:30 pm-9:27 pm

1 stop7h 57m

Moline Quad-City

Sat 5/31

10:55 am-9:57 pm

2 stops12h 02m

$344

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Thu 5/29

3:45 pm-11:56 pm

1 stop7h 11m

Chicago O'Hare Intl

Tue 6/3

10:00 am-6:44 pm

1 stop9h 44m

$345

BillingsChicago

BIL - ORD

BILORD

Billings Logan Intl

Wed 6/11

12:20 pm-6:12 am

1 stop16h 52m

Chicago O'Hare Intl

Sun 6/22

9:35 pm-9:34 pm

1 stop24h 59m

$388

BillingsMoline

BIL - MLI

BILMLI

Billings Logan Intl

Wed 5/28

6:23 am-4:34 pm

2 stops9h 11m

Moline Quad-City

Sun 6/1

6:00 am-5:17 pm

2 stops12h 17m

$499

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 20 results
1
2

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.
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

What is the cheapest month to book a flight from Billings to Illinois?

Currently, August is the cheapest month in which you can book a flight from Billings to Illinois (average of $245). Flying from Billings to Illinois in March is currently the most expensive (average of $321). 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 May 1, 2025.

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.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 1, 2025.
See what other customers who have flown with Alaska Airlines, Delta and Hawaiian 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.
Alaska Airlines
8.0
Very good
9,968 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
9,968 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,934 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,406 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,968 reviews

Boarding

8.2

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • What airport do you fly from for flights from Billings to Illinois?

    Billings Logan Intl (BIL) is the airport you will fly out of if you book a flight from Billings to Illinois. It is only a 2.7 mi journey to Billings Logan Intl (BIL) from Billings’s city center.

  • What are the cheapest airlines to fly from Billings to Illinois one-way?

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as $157. However, be on the lookout for offers from Alaska Airlines and American Airlines, as they are both options that can get you from Billings to Illinois for a low price.

  • What are the most popular routes from Billings to Illinois?

    Most travelers choose Billings Logan Intl - Chicago O'Hare Intl, Billings Logan Intl - Chicago Midway or Billings Logan Intl - Lambert-St Louis when deciding on the best route from Billings to Illinois.

  • What are the cheapest flights from Billings to Illinois?

    The cheapest flight price from Billings to Illinois is $150. On average you can expect to pay $742. The most popular route, (Billings Logan Intl - Chicago O'Hare Intl), can usually be booked for $234.

  • Can I find deals for flights from Billings to Illinois that include hotel bookings?

    Yes. In addition to deals on Billings to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Billings to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Billings to Illinois.

  • Can I find deals for business class flights from Billings to Illinois?

    Yes. Cheapflights offers flight deals from Billings to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Billings to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Billings to Illinois (average of $245). Flying from Billings to Illinois in March is currently the most expensive (average of $321). 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.

See more FAQs

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.
Kalispell to Seattle flights
Bozeman to Newark flights
Bozeman to Seattle flights
Bozeman to John F Kennedy Intl flights
Kalispell to Portland flights
Billings to Seattle flights
Missoula to Seattle flights
Bozeman to Los Angeles flights
Missoula to O'Hare Intl flights
Missoula to Denver flights
Bozeman to Atlanta flights
Missoula to Minneapolis flights
Bozeman to Philadelphia flights
Bozeman to O'Hare Intl flights
Bozeman to Denver flights
Bozeman to Boston flights
Bozeman to LaGuardia flights
Bozeman to Las Vegas flights
Bozeman to Minneapolis flights
Bozeman to San Francisco flights
Great Falls to Seattle flights
Kalispell to O'Hare Intl flights
Billings to Dallas/Fort Worth flights
Missoula to Nashville flights
Bozeman to San Diego flights
Bozeman to Cincinnati flights
Kalispell to Denver flights
Missoula to John F Kennedy Intl flights
Billings to Portland flights
Bozeman to Dulles Intl flights
Billings to O'Hare Intl flights
Missoula to LaGuardia flights
Butte to Seattle flights
Missoula to Las Vegas flights
Bozeman to Orlando flights
Bozeman to Baltimore flights
Bozeman to Miami flights
Missoula to Dulles Intl flights
Kalispell to San Francisco flights
Bozeman to Salt Lake City flights
Billings to Minneapolis flights
Billings to Denver flights
Missoula to Dallas/Fort Worth flights
Kalispell to Minneapolis flights
Missoula to Salt Lake City flights
Bozeman to Dallas/Fort Worth flights
Kalispell to Boston flights
Billings to Baltimore flights
Missoula to Sacramento flights
Missoula to Boston flights

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 May 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$239Average$595FlexibilityNo cancel feeOn-time69%
DeltaCheapest$314Average$384FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$316Average$655FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.