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Cheap flights from Illinois to Belfast Intl Airport from £316

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 29/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
17 May — 24 May1
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 17 April 2026.

Mon 1/610:00
ORD
-
BFS
2 stops24h 15m
Multiple Airlines
Mon 8/618:50
BFS
-
ORD
3 stops29h 25m
Multiple Airlines
Deal found 17/4£618
Mon 27/419:25
ORD
-
BFS
2 stops17h 25m
Multiple Airlines
Wed 6/505:55
BFS
-
ORD
2 stops18h 20m
Multiple Airlines
Deal found 14/4£626
Sun 26/419:25
ORD
-
BFS
2 stops20h 05m
Multiple Airlines
Wed 29/408:15
BFS
-
ORD
3 stops31h 21m
Multiple Airlines
Deal found 13/4£631
Sun 13/919:05
ORD
-
BFS
2 stops20h 45m
Multiple Airlines
Sun 20/907:10
BFS
-
ORD
3 stops37h 20m
Multiple Airlines
Deal found 17/4£662
Wed 19/819:05
ORD
-
BFS
2 stops21h 15m
Multiple Airlines
Wed 26/807:30
BFS
-
ORD
3 stops35h 10m
Multiple Airlines
Deal found 13/4£693
Thu 22/1019:25
ORD
-
BFS
2 stops21h 40m
Multiple Airlines
Tue 27/1006:00
BFS
-
ORD
3 stops42h 25m
Multiple Airlines
Deal found 16/4£695
Sun 31/517:35
ORD
-
BFS
2 stops21h 25m
Multiple Airlines
Sun 7/622:10
BFS
-
ORD
3 stops47h 00m
Multiple Airlines
Deal found 16/4£714
Thu 28/507:05
STL
-
BFS
3 stops29h 50m
Multiple Airlines
Thu 4/621:05
BFS
-
STL
2 stops29h 20m
Multiple Airlines
Deal found 13/4£1,074
Mon 18/507:05
STL
-
BFS
2 stops22h 10m
Multiple Airlines
Wed 27/521:35
BFS
-
STL
3 stops28h 34m
Multiple Airlines
Deal found 17/4£1,207
Sat 16/507:05
STL
-
BFS
2 stops29h 50m
Multiple Airlines
Sat 23/507:20
BFS
-
STL
2 stops18h 49m
Multiple Airlines
Deal found 16/4£1,213
Sat 11/712:10
STL
-
BFS
3 stops27h 20m
Multiple Airlines
Thu 16/706:40
BFS
-
STL
2 stops13h 22m
Multiple Airlines
Deal found 17/4£1,549
Mon 27/411:00
MDW
-
BFS
3 stops27h 40m
Multiple Airlines
Thu 30/406:10
BFS
-
MDW
3 stops33h 35m
Multiple Airlines
Deal found 14/4£1,566

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 17 April 2026.

Round-trip from

£618

One-way from

£316
1/6-8/6
  • 1/6-8/6
  • 5 total stops
  • 53h 40m total
  • Illinois to Belfast
Search Deals
29/5
  • 29/5
  • 2 total stops
  • 30h 35m 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 17 April 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

Mon 1/6

10:00-16:15

2 stops24h 15m

Belfast Intl

Mon 8/6

18:50-18:15

3 stops29h 25m

£618

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 19/8

19:05-22:20

2 stops21h 15m

Belfast Intl

Wed 26/8

07:30-12:40

3 stops35h 10m

£693

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 31/5

17:35-21:00

2 stops21h 25m

Belfast Intl

Sun 7/6

22:10-15:10

3 stops47h 00m

£714

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 13/9

22:25-21:55

3 stops17h 30m

Belfast Intl

Sun 20/9

07:10-14:30

3 stops37h 20m

£715

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 27/4

19:25-20:40

2 stops19h 15m

Belfast Intl

Wed 6/5

20:15-09:40

3 stops43h 25m

£729

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 30/5

09:25-08:55

3 stops17h 30m

Belfast Intl

Sat 6/6

06:55-13:10

3 stops36h 15m

£797
Fastest return journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 28/5

15:50-18:55

2 stops21h 05m

Belfast Intl

Thu 4/6

08:20-19:25

2 stops17h 05m

£829

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 26/6

16:37-21:15

2 stops22h 38m

Belfast Intl

Sat 4/7

07:40-11:50

2 stops34h 10m

£901

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 28/5

07:05-18:55

3 stops29h 50m

Belfast Intl

Thu 4/6

21:05-20:25

2 stops29h 20m

£1,074

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sat 16/5

07:05-18:55

2 stops29h 50m

Belfast Intl

Sat 23/5

07:20-20:09

2 stops18h 49m

£1,213

Flights are sorted by cheapest return flights first.

Deals found on 13/4

Showing 1-10 of 19 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
Cookstown
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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