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Cheap flights from Illinois to Belfast Intl Airport from £251

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 17/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
5 Jul — 12 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 5 June 2026.

Wed 19/819:25
ORD
-
BFS
2 stops17h 45m
Multiple Airlines
Wed 26/817:45
BFS
-
ORD
2 stops24h 55m
Multiple Airlines
Deal found 2/6£629
Sun 26/722:25
ORD
-
BFS
2 stops18h 45m
Multiple Airlines
Tue 11/823:30
BFS
-
ORD
2 stops28h 35m
Multiple Airlines
Deal found 3/6£663
Wed 15/709:50
ORD
-
BFS
2 stops27h 25m
Multiple Airlines
Wed 22/722:45
BFS
-
ORD
3 stops27h 20m
Multiple Airlines
Deal found 1/6£664
Sat 1/819:25
ORD
-
BFS
2 stops22h 00m
Multiple Airlines
Mon 10/806:30
BFS
-
ORD
2 stops19h 22m
Multiple Airlines
Deal found 2/6£701
Mon 20/719:25
ORD
-
BFS
2 stops20h 50m
Multiple Airlines
Mon 27/706:40
BFS
-
ORD
2 stops17h 35m
Multiple Airlines
Deal found 5/6£745
Wed 1/715:45
ORD
-
BFS
2 stops24h 35m
Multiple Airlines
Wed 8/722:45
BFS
-
ORD
2 stops27h 07m
Multiple Airlines
Deal found 1/6£771
Sun 23/808:55
STL
-
BFS
2 stops30h 25m
Multiple Airlines
Mon 31/806:30
BFS
-
STL
3 stops39h 08m
Multiple Airlines
Deal found 2/6£857
Thu 2/708:55
STL
-
BFS
3 stops28h 00m
Multiple Airlines
Sun 5/706:00
BFS
-
STL
2 stops14h 02m
Multiple Airlines
Deal found 3/6£1,043
Tue 16/608:40
STL
-
BFS
2 stops29h 00m
Multiple Airlines
Thu 25/607:30
BFS
-
STL
3 stops34h 51m
Multiple Airlines
Deal found 3/6£1,103
Sun 21/614:15
STL
-
BFS
2 stops16h 35m
Multiple Airlines
Thu 2/706:40
BFS
-
STL
2 stops19h 27m
Multiple Airlines
Deal found 4/6£1,271
Sun 21/615:30
STL
-
BFS
2 stops25h 40m
Multiple Airlines
Tue 30/607:35
BFS
-
STL
2 stops18h 32m
Multiple Airlines
Deal found 3/6£1,353

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 5 June 2026.

Round-trip from

£629

One-way from

£251
19/8-26/8
  • 19/8-26/8
  • 4 total stops
  • 42h 40m total
  • Illinois to Belfast
Search Deals
17/7
  • 17/7
  • 2 total stops
  • 56h 32m 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 5 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

Wed 19/8

19:25-19:10

2 stops17h 45m

Belfast Intl

Wed 26/8

17:45-12:40

2 stops24h 55m

£629

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 15/7

09:50-19:15

2 stops27h 25m

Belfast Intl

Wed 22/7

22:45-20:05

3 stops27h 20m

£664

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 26/7

22:25-15:55

2 stops11h 30m

Belfast Intl

Tue 11/8

23:30-20:05

3 stops26h 35m

£700

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 1/7

15:45-22:20

2 stops24h 35m

Belfast Intl

Wed 8/7

22:45-19:52

2 stops27h 07m

£771
Fastest return journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 18/7

22:25-20:50

2 stops16h 25m

Belfast Intl

Fri 24/7

07:20-16:57

2 stops15h 37m

£800

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 6/7

19:25-20:55

3 stops19h 30m

Belfast Intl

Sun 12/7

06:45-14:55

3 stops38h 10m

£801

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 7/7

22:25-22:15

2 stops17h 50m

Belfast Intl

Sun 12/7

06:45-22:05

3 stops45h 20m

£810

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 19/7

19:25-18:25

2 stops17h 00m

Belfast Intl

Sun 26/7

06:45-18:15

2 stops17h 30m

£855

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 23/8

08:55-21:20

2 stops30h 25m

Belfast Intl

Mon 31/8

06:30-15:38

3 stops39h 08m

£857

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 2/7

08:55-18:55

3 stops28h 00m

Belfast Intl

Sun 5/7

06:45-14:02

3 stops37h 17m

£1,044

Flights are sorted by cheapest return flights first.

Deals found on 2/6

Showing 1-10 of 30 resultsSorted by cheapest first
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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 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
Ballymena
Dungannon

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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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