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Cheap flights from Illinois to Belfast Intl Airport from £263

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
3 Aug — 10 Aug1
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 4 July 2026.

Tue 1/919:25
ORD
-
BFS
3 stops21h 20m
Multiple Airlines
Tue 8/922:30
BFS
-
ORD
3 stops44h 10m
Multiple Airlines
Deal found 29/6£535
Wed 16/914:15
ORD
-
BFS
2 stops20h 50m
Multiple Airlines
Tue 22/908:50
BFS
-
ORD
3 stops42h 30m
Multiple Airlines
Deal found 3/7£552
Mon 17/819:25
ORD
-
BFS
3 stops21h 55m
Multiple Airlines
Wed 9/910:50
BFS
-
ORD
3 stops40h 30m
Multiple Airlines
Deal found 29/6£577
Sun 6/919:25
ORD
-
BFS
2 stops20h 25m
Multiple Airlines
Sat 12/920:15
BFS
-
ORD
3 stops47h 45m
Multiple Airlines
Deal found 2/7£588
Sun 6/919:25
ORD
-
BFS
2 stops20h 25m
Multiple Airlines
Mon 14/921:25
BFS
-
ORD
3 stops28h 23m
Multiple Airlines
Deal found 2/7£615
Sat 5/919:25
ORD
-
BFS
2 stops19h 15m
Multiple Airlines
Sat 12/920:15
BFS
-
ORD
3 stops47h 45m
Multiple Airlines
Deal found 2/7£621
Mon 3/819:25
ORD
-
BFS
2 stops21h 45m
Multiple Airlines
Wed 19/822:45
BFS
-
ORD
2 stops27h 07m
Multiple Airlines
Deal found 30/6£662
Wed 5/819:25
ORD
-
BFS
2 stops16h 30m
Multiple Airlines
Mon 7/921:25
BFS
-
ORD
3 stops28h 23m
Multiple Airlines
Deal found 1/7£669
Wed 12/812:10
STL
-
BFS
3 stops28h 10m
Multiple Airlines
Wed 19/822:45
BFS
-
STL
2 stops21h 17m
Multiple Airlines
Deal found 29/6£883
Fri 14/812:10
STL
-
BFS
2 stops22h 20m
Multiple Airlines
Fri 21/807:20
BFS
-
STL
2 stops19h 04m
Multiple Airlines
Deal found 30/6£957

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 4 July 2026.

Round-trip from

£535

One-way from

£263
1/9-8/9
  • 1/9-8/9
  • 6 total stops
  • 65h 30m total
  • Illinois to Belfast
Search Deals
28/10
  • 28/10
  • 2 total stops
  • 31h 20m 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 4 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

Tue 1/9

19:25-23:20

3 stops21h 55m

Belfast Intl

Tue 8/9

06:40-21:25

2 stops20h 45m

£588

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 5/8

19:25-17:55

2 stops16h 30m

Belfast Intl

Mon 7/9

15:35-18:15

2 stops32h 40m

£678

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 16/8

22:25-22:50

3 stops18h 25m

Belfast Intl

Sun 23/8

06:45-16:57

3 stops40h 12m

£700

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 3/8

19:25-23:20

3 stops21h 55m

Belfast Intl

Mon 10/8

20:35-22:05

3 stops31h 30m

£710
Fastest return journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 14/8

18:00-21:15

2 stops21h 15m

Belfast Intl

Fri 21/8

07:20-19:52

2 stops18h 32m

£730

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 15/8

15:45-18:55

2 stops21h 10m

Belfast Intl

Sat 22/8

21:15-19:15

2 stops28h 00m

£737

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 12/8

12:10-22:20

3 stops28h 10m

Belfast Intl

Wed 19/8

22:45-14:02

2 stops21h 17m

£883

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 14/8

12:10-16:30

2 stops22h 20m

Belfast Intl

Fri 21/8

07:20-20:24

2 stops19h 04m

£957
Cheapest one-way

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 28/10

19:30-07:50

2 stops31h 20m

£263
Fastest single journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 1/9

22:25-19:40

2 stops15h 15m

£272

Flights are sorted by cheapest return flights first.

Deals found on 3/7

Showing 1-10 of 11 resultsSorted by cheapest first
1
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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

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

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

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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.

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