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Cheap flights from Illinois to Belfast from £325

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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
19 Aug — 26 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Belfast

Enter your travel dates to find the best prices.

Cheapest flights from Illinois to Belfast
Explore the most affordable flight options available from Illinois to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 July 2026.

Sat 29/819:25
ORD
-
BFS
2 stops20h 50m
Multiple Airlines
Sat 5/921:30
BFS
-
ORD
3 stops29h 55m
Multiple Airlines
Deal found 14/7£560
Tue 27/1019:30
ORD
-
BFS
2 stops20h 25m
Multiple Airlines
Mon 2/1122:05
BFS
-
ORD
3 stops47h 25m
Multiple Airlines
Deal found 18/7£595
Sun 4/1022:25
ORD
-
BFS
2 stops16h 35m
Multiple Airlines
Sat 10/1015:35
BFS
-
ORD
3 stops30h 35m
Multiple Airlines
Deal found 15/7£596
Tue 1/1218:30
ORD
-
BFS
2 stops20h 25m
Multiple Airlines
Tue 8/1220:35
BFS
-
ORD
3 stops26h 45m
Multiple Airlines
Deal found 18/7£600
Wed 2/919:25
ORD
-
BFS
2 stops19h 45m
Multiple Airlines
Wed 9/910:50
BFS
-
ORD
3 stops40h 30m
Multiple Airlines
Deal found 19/7£644
Tue 1/1217:10
ORD
-
BHD
1 stop12h 20m
British Airways
Tue 8/1206:35
BHD
-
ORD
1 stop13h 10m
British Airways
Deal found 18/7£646
Sun 6/1221:50
ORD
-
BHD
1 stop14h 50m
British Airways
Wed 9/1211:25
BHD
-
ORD
1 stop13h 20m
British Airways
Deal found 15/7£658
Sat 12/919:25
ORD
-
BHD
2 stops19h 10m
Multiple Airlines
Sun 20/915:10
BHD
-
ORD
2 stops33h 05m
Multiple Airlines
Deal found 15/7£663
Tue 27/1022:50
ORD
-
BHD
1 stop12h 55m
British Airways
Mon 2/1119:25
BHD
-
ORD
1 stop29h 20m
British Airways
Deal found 18/7£669
Sat 24/1016:26
ORD
-
BHD
2 stops16h 49m
British Airways
Mon 2/1119:25
BHD
-
ORD
2 stops31h 35m
British Airways
Deal found 15/7£672
Mon 7/921:15
ORD
-
BHD
1 stop12h 15m
British Airways
Fri 18/911:00
BHD
-
ORD
1 stop13h 15m
British Airways
Deal found 15/7£681
Sun 1/1114:08
STL
-
BHD
2 stops17h 47m
American Airlines
Sun 8/1112:10
BHD
-
STL
2 stops17h 48m
American Airlines
Deal found 17/7£721

Find flight deals from Illinois to Belfast

Keep the following information in mind while searching for Illinois to Belfast flight deals. Data was last updated 20 July 2026.

Round-trip from

£560

One-way from

£325
29/8-5/9
  • 29/8-5/9
  • 5 total stops
  • 50h 45m total
  • Illinois to Belfast
Search Deals
British Airways
  • British Airways
  • 8/9
  • 2 total stops
  • 33h 27m total
  • Illinois to Belfast
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois to Belfast 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 20 July 2026.
Use the filters below to find and compare flights from Illinois to Belfast 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 27/10

19:30-20:55

2 stops20h 25m

Belfast Intl

Mon 2/11

22:05-15:30

3 stops47h 25m

£595

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 4/10

19:25-22:35

3 stops21h 10m

Belfast Intl

Sat 10/10

15:35-16:10

3 stops30h 35m

£612

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 2/9

19:25-21:10

2 stops19h 45m

Belfast Intl

Wed 9/9

10:50-21:20

3 stops40h 30m

£644
Fastest return journey

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Sun 6/12

21:50-18:40

1 stop14h 50m

Belfast City

Wed 9/12

11:25-18:45

1 stop13h 20m

£658

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 1/12

13:31-11:30

2 stops15h 59m

Belfast City

Tue 8/12

10:00-18:45

1 stop14h 45m

£662

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 1/12

07:05-20:55

3 stops31h 50m

Belfast Intl

Tue 8/12

20:35-17:20

3 stops26h 45m

£662

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 27/10

22:50-16:45

1 stop12h 55m

Belfast City

Mon 2/11

19:25-18:45

1 stop29h 20m

£669

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Mon 17/8

20:45-15:30

1 stop12h 45m

Belfast City

Mon 24/8

19:35-13:50

1 stop24h 15m

£696

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 18/8

19:25-21:20

3 stops19h 55m

Belfast Intl

Mon 24/8

20:35-20:05

2 stops29h 30m

£709

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 1/11

14:08-13:55

2 stops17h 47m

Belfast City

Sun 8/11

12:10-23:58

2 stops17h 48m

£721

Flights are sorted by cheapest return flights first.

Deals found on 19/7

Showing 1-10 of 35 resultsSorted by cheapest first
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Best time to book a flight from Illinois to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast 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

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. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Belfast?

    For as low as £751, British Airways can have you in Belfast from Illinois in 14h 10m. Airlines will cover a distance of 3647 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Illinois to Belfast?

    The most popular route from Illinois to Belfast is Chicago O'Hare Intl - Belfast Intl. You may also consider Chicago O'Hare Intl - Belfast City or Chicago Midway - Belfast City.

  • Can I find deals for flights from Illinois to Belfast that include hotel bookings?

    Yes. In addition to deals on Illinois to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Belfast?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Belfast.

  • Can I find deals for business class flights from Illinois to Belfast?

    Yes. Cheapflights offers flight deals from Illinois to Belfast 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

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

Deals for Illinois to Belfast flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

Cheapflights helps you find that perfect flight to Belfast from Illinois by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Illinois to Belfast with no change fees?

Need flexible booking options for your flight to Belfast from Illinois? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Belfast become cheaper?

Yes! Start tracking prices for Illinois to Belfast flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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