HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Belfast Intl

$322+ Cheap flights from Illinois to Belfast Intl (BFS)

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 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
Oct 16 — Oct 231
Thu 10/16
Thu 10/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Belfast Intl 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 Illinois to Belfast Intl

Keep the following information in mind while searching for Illinois to Belfast Intl flight deals. Data was last updated September 16, 2025.

Round-trip from

$583
(Trip.com)

One-way from

$322
(Kiwi.com)
From Illinois to Belfast Intl
Search Deals
One-way flight from Illinois to Belfast Intl
Search Deals

Find flight deals from Illinois to Belfast Intl

Cheapest flights from Illinois to Belfast Intl
Explore the most affordable flight options available from Illinois to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/291:26 pmSTL - BFS
2 stops27h 44mMultiple Airlines
Tue 10/76:45 amBFS - STL
2 stops21h 19mMultiple Airlines
Deal found 9/15$583
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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.
Fri 10/319:15 pmORD - BFS
3 stops20h 30mMultiple Airlines
Mon 11/1010:20 pmBFS - ORD
3 stops46h 40mMultiple Airlines
Deal found 9/14$726
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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.
Thu 10/166:00 pmORD - BFS
3 stops23h 25mMultiple Airlines
Sat 10/256:00 amBFS - ORD
3 stops39h 45mMultiple Airlines
Deal found 9/14$736
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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.
Mon 9/296:30 amORD - BFS
2 stops31h 55mMultiple Airlines
Thu 10/24:25 pmBFS - ORD
3 stops30h 05mMultiple Airlines
Deal found 9/15$760
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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.
Sat 9/278:40 amORD - BFS
3 stops26h 30mMultiple Airlines
Thu 10/24:25 pmBFS - ORD
3 stops30h 05mMultiple Airlines
Deal found 9/15$784
This Trip.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/267:25 pmORD - BFS
2 stops20h 55mMultiple Airlines
Wed 10/19:05 pmBFS - ORD
2 stops27h 10mMultiple Airlines
Deal found 9/15$802
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/286:30 amORD - BFS
2 stops31h 50mMultiple Airlines
Thu 10/24:25 pmBFS - ORD
3 stops30h 05mMultiple Airlines
Deal found 9/15$827
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:25 pmORD - BFS
2 stops20h 55mMultiple Airlines
Wed 10/15:20 pmBFS - ORD
2 stops25h 15mMultiple Airlines
Deal found 9/15$836
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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.
Thu 10/307:30 pmORD - BFS
2 stops12h 05mMultiple Airlines
Mon 11/1010:20 pmBFS - ORD
3 stops46h 40mMultiple Airlines
Deal found 9/14$844
This Mytrip deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/294:50 pmSTL - BFS
2 stops18h 20mMultiple Airlines
Wed 11/58:50 pmBFS - STL
3 stops47h 05mMultiple Airlines
Deal found 9/14$1,877
This Mytrip deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” 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.
Mon 9/299:35 amMDW - BFS
3 stops29h 20mMultiple Airlines
Thu 10/27:10 amBFS - MDW
3 stops31h 29mMultiple Airlines
Deal found 9/16$2,132

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Belfast Intl 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 September 16, 2025.
Use the filters below to find and compare flights from Illinois to Belfast Intl Airport that are best for you.

Fly from

Illinois

Fly to

Belfast Intl

Route

Depart

Return

Price

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 9/29

1:26 pm-11:10 pm

2 stops27h 44m

Belfast Intl

Tue 10/7

6:45 am-10:04 pm

2 stops21h 19m

$583

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 10/16

6:00 pm-11:25 pm

3 stops23h 25m

Belfast Intl

Sat 10/25

6:00 am-3:45 pm

3 stops39h 45m

$736

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 9/27

8:40 am-5:10 pm

3 stops26h 30m

Belfast Intl

Thu 10/2

4:25 pm-4:30 pm

3 stops30h 05m

$784

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 9/26

7:25 pm-10:20 pm

2 stops20h 55m

Belfast Intl

Wed 10/1

9:05 pm-6:15 pm

2 stops27h 10m

$802

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 9/28

6:30 am-8:20 pm

2 stops31h 50m

Belfast Intl

Thu 10/2

4:25 pm-4:30 pm

3 stops30h 05m

$827

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 10/30

7:30 pm-12:35 pm

2 stops12h 05m

Belfast Intl

Mon 11/10

10:20 pm-3:00 pm

3 stops46h 40m

$844

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 9/28

7:15 pm-11:20 pm

3 stops22h 05m

Belfast Intl

Wed 10/1

5:20 pm-12:35 pm

2 stops25h 15m

$845

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 10/30

7:30 pm-12:35 pm

2 stops12h 05m

Belfast Intl

Thu 11/6

6:15 am-3:15 pm

3 stops39h 00m

$858

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 9/29

12:00 pm-1:15 pm

3 stops19h 15m

Belfast Intl

Thu 10/2

4:25 pm-4:30 pm

3 stops30h 05m

$894

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 10/30

10:00 am-10:05 pm

2 stops31h 05m

Belfast Intl

Sun 11/2

5:30 am-8:00 pm

2 stops19h 30m

$932

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 13 results
1
2

Best time to book a flight from Illinois to Belfast Intl

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl from Illinois 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 Illinois to Belfast Intl Airport

What is the cheapest time of day to fly from IL to BFS?

Find hourly flight availability from Illinois to Belfast Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

When flying from Illinois to Belfast Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Illinois to Belfast Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from Illinois to Belfast Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the most popular routes from Illinois to Belfast Intl Airport?

    The most popular flight routes from Illinois to Belfast Intl Airport are Chicago O'Hare Intl - Belfast Intl, Chicago Midway - Belfast Intl and Lambert-St Louis - Belfast Intl.

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

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

  • How can I find direct flights from Illinois to Belfast Intl?

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

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

    Yes. Cheapflights offers flight deals from Illinois to Belfast Intl 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 Illinois to Belfast Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from Illinois to Belfast Intl Airport (average of $657). Flying from Illinois to Belfast Intl Airport in June is currently the most expensive (average of $1,189). 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 Illinois to Belfast Intl

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Belfast Intl flights
Newark to Belfast Intl flights
John F Kennedy Intl to Belfast City flights
Seattle to Belfast City flights
Los Angeles to Belfast Intl flights
Los Angeles to Belfast City flights
Dallas/Fort Worth to Belfast City flights
Atlanta to Belfast Intl flights
Newark to Belfast City flights
O'Hare Intl to Belfast Intl flights
Dallas/Fort Worth to Belfast Intl flights
O'Hare Intl to Belfast City flights
Boston to Belfast Intl flights
Hobby to Belfast City flights
LaGuardia to Belfast Intl flights
Atlanta to Belfast City flights
Boston to Belfast City flights
LaGuardia to Belfast City flights
Hobby to Belfast Intl flights
Philadelphia to Belfast Intl flights
Charlotte to Belfast Intl flights
Charlotte to Belfast City flights
Philadelphia to Belfast City flights
Orlando to Belfast Intl flights
Dulles Intl to Belfast Intl flights
Cincinnati to Belfast City flights
Reagan-National to Belfast Intl flights
Dulles Intl to Belfast City flights
Sky Harbor Intl to Belfast Intl flights
San Francisco to Belfast Intl flights
San Francisco to Belfast City flights
Nashville to Belfast Intl flights
Nashville to Belfast City flights
Love Field to Belfast City flights
Reagan-National to Belfast City flights
George Bush Intcntl to Belfast City flights
Sky Harbor Intl to Belfast City flights
Rochester to Belfast City flights
Austin to Belfast Intl flights
Buffalo to Belfast City flights
Dayton to Belfast City flights
Midway to Belfast City flights
Indianapolis to Belfast Intl flights
Las Vegas to Belfast Intl flights
Orlando to Belfast City flights
Miami to Belfast Intl flights
Miami to Belfast City flights
Portland to Belfast Intl flights
Santa Ana to Belfast City flights

Top airline flying from Illinois to Belfast Intl

Discover the top airline that operate flights from Illinois to Belfast Intl. 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 September 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$577Average$720FlexibilityNo cancel feeOn-time70%

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.