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Cheap flights from Illinois to Belfast Intl Airport from £552

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
27 Aug — 3 Sep1
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 28 July 2026.

Wed 9/919:25
ORD
-
BFS
2 stops15h 40m
Multiple Airlines
Wed 16/907:35
BFS
-
ORD
2 stops19h 50m
Multiple Airlines
Deal found 26/7£552
Mon 7/919:25
ORD
-
BFS
2 stops19h 15m
Multiple Airlines
Mon 14/921:25
BFS
-
ORD
3 stops28h 23m
Multiple Airlines
Deal found 26/7£566
Tue 8/919:25
ORD
-
BFS
2 stops18h 15m
Multiple Airlines
Tue 15/908:00
BFS
-
ORD
3 stops40h 15m
Multiple Airlines
Deal found 24/7£600
Sun 6/912:10
STL
-
BFS
2 stops23h 15m
Multiple Airlines
Sun 13/908:25
BFS
-
STL
2 stops35h 00m
Multiple Airlines
Deal found 24/7£852
Mon 7/908:55
STL
-
BFS
2 stops20h 20m
Multiple Airlines
Mon 14/921:55
BFS
-
STL
2 stops21h 30m
Multiple Airlines
Deal found 23/7£907
Sat 8/808:55
STL
-
BFS
2 stops18h 40m
Multiple Airlines
Sat 15/806:55
BFS
-
STL
2 stops19h 29m
Multiple Airlines
Deal found 24/7£1,228

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 28 July 2026.

Round-trip from

£552
9/9-16/9
  • 9/9-16/9
  • 4 total stops
  • 35h 30m 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 28 July 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

Wed 9/9

22:25-17:05

2 stops12h 40m

Belfast Intl

Wed 16/9

09:35-12:40

2 stops33h 05m

£578

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 1/12

18:30-20:55

2 stops20h 25m

Belfast Intl

Wed 9/12

10:40-17:20

3 stops36h 40m

£585

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 7/9

22:25-22:00

3 stops17h 35m

Belfast Intl

Mon 14/9

21:25-19:48

3 stops28h 23m

£605

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 8/9

22:25-19:40

2 stops15h 15m

Belfast Intl

Tue 15/9

07:00-21:25

3 stops44h 25m

£621

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 12/9

22:25-22:40

2 stops18h 15m

Belfast Intl

Sun 20/9

22:05-19:15

2 stops27h 10m

£658

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 7/9

08:55-11:15

2 stops20h 20m

Belfast Intl

Mon 14/9

21:55-13:25

2 stops21h 30m

£907

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 6/9

12:10-18:25

2 stops24h 15m

Belfast Intl

Sun 13/9

17:00-20:20

3 stops33h 20m

£949
Fastest return journey

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sat 8/8

08:55-09:35

2 stops18h 40m

Belfast Intl

Sat 15/8

06:55-20:24

2 stops19h 29m

£1,228

Flights are sorted by cheapest return flights first.

Deals found on 26/7

Sorted by cheapest first

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 Lambert-St Louis - Belfast Intl or Chicago Midway - 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

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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.

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