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Cheap flights from Illinois to Belfast Intl Airport from £343

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 17/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
22 Jun — 29 Jun1
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 23 May 2026.

Wed 7/1019:25
ORD
-
BFS
2 stops14h 30m
Multiple Airlines
Wed 21/1009:35
BFS
-
ORD
2 stops34h 25m
Multiple Airlines
Deal found 22/5£663
Sun 5/710:43
ORD
-
BFS
2 stops30h 07m
Multiple Airlines
Tue 21/723:30
BFS
-
ORD
2 stops23h 27m
Multiple Airlines
Deal found 22/5£677
Sun 9/819:25
ORD
-
BFS
2 stops19h 55m
Multiple Airlines
Sun 16/806:45
BFS
-
ORD
3 stops36h 37m
Multiple Airlines
Deal found 21/5£689
Wed 17/614:15
ORD
-
BFS
2 stops23h 00m
Multiple Airlines
Wed 24/606:15
BFS
-
ORD
3 stops34h 01m
Multiple Airlines
Deal found 20/5£715
Thu 2/709:50
ORD
-
BFS
3 stops27h 05m
Multiple Airlines
Thu 9/706:40
BFS
-
ORD
2 stops21h 25m
Multiple Airlines
Deal found 18/5£732
Thu 9/708:45
ORD
-
BFS
3 stops31h 00m
Multiple Airlines
Mon 13/706:40
BFS
-
ORD
2 stops16h 17m
Multiple Airlines
Deal found 19/5£739
Thu 11/609:55
ORD
-
BFS
2 stops29h 50m
Multiple Airlines
Tue 16/621:15
BFS
-
ORD
2 stops28h 10m
Multiple Airlines
Deal found 18/5£757
Sun 5/712:10
STL
-
BFS
2 stops25h 15m
Multiple Airlines
Sun 12/706:45
BFS
-
STL
3 stops43h 37m
Multiple Airlines
Deal found 21/5£912
Sun 9/815:30
STL
-
BFS
2 stops24h 20m
Multiple Airlines
Sun 16/806:45
BFS
-
STL
3 stops43h 22m
Multiple Airlines
Deal found 18/5£957
Sat 4/714:40
STL
-
BFS
2 stops12h 55m
Multiple Airlines
Thu 16/706:40
BFS
-
STL
2 stops19h 42m
Multiple Airlines
Deal found 18/5£1,045

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 23 May 2026.

Round-trip from

£663

One-way from

£343
7/10-21/10
  • 7/10-21/10
  • 4 total stops
  • 48h 55m total
  • Illinois to Belfast
Search Deals
17/6
  • 17/6
  • 2 total stops
  • 23h 00m 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 23 May 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 7/10

19:25-15:55

2 stops14h 30m

Belfast Intl

Wed 21/10

09:35-14:00

2 stops34h 25m

£663

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 9/7

08:45-21:45

3 stops31h 00m

Belfast Intl

Mon 13/7

06:40-16:57

2 stops16h 17m

£739

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 17/6

14:15-19:15

2 stops23h 00m

Belfast Intl

Wed 24/6

05:55-22:05

2 stops22h 10m

£744

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 11/6

09:55-21:45

2 stops29h 50m

Belfast Intl

Tue 16/6

21:15-19:25

2 stops28h 10m

£757

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 11/7

08:45-18:55

3 stops28h 10m

Belfast Intl

Sun 26/7

06:45-13:22

3 stops36h 37m

£763

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 14/8

19:25-23:20

3 stops21h 55m

Belfast Intl

Tue 18/8

11:55-21:25

3 stops39h 30m

£818

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 18/7

09:50-21:30

2 stops29h 40m

Belfast Intl

Sat 25/7

06:55-20:05

3 stops19h 10m

£822

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 4/7

19:25-23:25

2 stops22h 00m

Belfast Intl

Sat 11/7

06:55-20:05

3 stops19h 10m

£829

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 2/7

14:15-19:30

2 stops23h 15m

Belfast Intl

Thu 9/7

06:40-16:57

2 stops16h 17m

£883

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 5/7

12:10-19:25

2 stops25h 15m

Belfast Intl

Sun 12/7

06:45-20:22

3 stops43h 37m

£912

Flights are sorted by cheapest return flights first.

Deals found on 19/5

Showing 1-10 of 20 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 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
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?

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.

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