Find flights
When to book
FAQs

Cheap flights from Illinois to Belfast Intl Airport from £241

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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
20 Jul — 27 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Belfast Intl

Enter your travel dates to find the best prices.

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 20 June 2026.

Wed 7/1019:25
ORD
-
BFS
2 stops19h 45m
Multiple Airlines
Wed 21/1021:05
BFS
-
ORD
3 stops27h 10m
Multiple Airlines
Deal found 19/6£612
Sun 5/709:50
ORD
-
BFS
2 stops31h 00m
Multiple Airlines
Tue 28/722:45
BFS
-
ORD
2 stops24h 12m
Multiple Airlines
Deal found 17/6£649
Wed 4/1118:30
ORD
-
BFS
3 stops20h 15m
Multiple Airlines
Wed 18/1107:55
BFS
-
ORD
3 stops40h 30m
Multiple Airlines
Deal found 19/6£655
Tue 14/708:45
ORD
-
BFS
3 stops29h 05m
Multiple Airlines
Mon 20/717:35
BFS
-
ORD
3 stops29h 22m
Multiple Airlines
Deal found 14/6£707
Thu 30/719:25
ORD
-
BFS
2 stops14h 25m
Multiple Airlines
Thu 6/808:20
BFS
-
ORD
2 stops14h 37m
Multiple Airlines
Deal found 15/6£720
Sun 2/812:10
STL
-
BFS
3 stops27h 20m
Multiple Airlines
Mon 10/806:30
BFS
-
STL
2 stops19h 52m
Multiple Airlines
Deal found 15/6£1,068
Mon 29/614:15
STL
-
BFS
2 stops19h 20m
Multiple Airlines
Thu 2/721:05
BFS
-
STL
3 stops29h 02m
Multiple Airlines
Deal found 15/6£1,188
Mon 13/714:40
STL
-
BFS
2 stops19h 45m
Multiple Airlines
Sun 19/721:25
BFS
-
STL
2 stops22h 37m
Multiple Airlines
Deal found 15/6£1,253

Find 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 20 June 2026.

Round-trip from

£612

One-way from

£241
7/10-21/10
  • 7/10-21/10
  • 5 total stops
  • 46h 55m total
  • Illinois to Belfast
Search Deals
4/8
  • 4/8
  • 2 total stops
  • 13h 50m total
  • Illinois to Belfast
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 20 June 2026.
Use the filters below to find and compare flights from Illinois to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 5/7

09:50-22:50

2 stops31h 00m

Belfast Intl

Tue 28/7

22:45-16:57

2 stops24h 12m

£649

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 7/10

19:25-17:05

2 stops15h 40m

Belfast Intl

Wed 21/10

09:35-12:40

2 stops33h 05m

£655

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 4/11

18:30-20:45

3 stops20h 15m

Belfast Intl

Wed 18/11

07:55-18:25

3 stops40h 30m

£655

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 14/7

08:45-19:50

3 stops29h 05m

Belfast Intl

Mon 20/7

17:35-16:57

3 stops29h 22m

£707
Fastest return journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 30/7

19:25-15:50

2 stops14h 25m

Belfast Intl

Thu 6/8

08:20-16:57

2 stops14h 37m

£720

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 2/8

12:10-21:30

3 stops27h 20m

Belfast Intl

Mon 10/8

06:30-20:22

2 stops19h 52m

£1,068

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 13/7

14:40-16:25

2 stops19h 45m

Belfast Intl

Sun 19/7

21:25-14:02

2 stops22h 37m

£1,253
Cheapest one-way
Fastest single journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 4/8

19:25-15:15

2 stops13h 50m

£241

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 12/9

19:25-21:25

2 stops20h 00m

£249

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 1/9

22:25-07:45

2 stops27h 20m

£255

Flights are sorted by cheapest return flights first.

Deals found on 14/6

Showing 1-10 of 13 resultsSorted by cheapest first
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 return 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
No data available for this route at this time. Please check back soon.

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?

    While some choose either Chicago Midway - Belfast Intl or Lambert-St Louis - Belfast Intl, Chicago O'Hare Intl - Belfast Intl is the most popular route from Illinois to Belfast Intl Airport.

  • 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 holiday 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.

See more FAQs

Travelling to a place near Belfast Intl Airport?

Book flights to Belfast Intl Airport if you plan to visit one of these locations
Armagh
Newry

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.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Illinois to Belfast Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Illinois to Belfast Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Belfast Intl?

Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Belfast Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Illinois to Belfast Intl with no change fees?

Yes! Cheapflights helps users easily find flights from Illinois to Belfast Intl with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Belfast Intl become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Belfast Intl from Illinois today and book when prices fit your budget.

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.