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Cheap flights from Illinois to Belfast from £174

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
16 Mar — 23 Mar1
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 14 February 2026.

Tue 3/318:30
ORD
-
BFS
2 stops12h 55m
Multiple Airlines
Sat 7/306:00
BFS
-
ORD
2 stops17h 20m
Multiple Airlines
Deal found 11/2£443
Tue 24/218:30
ORD
-
BFS
2 stops12h 55m
Multiple Airlines
Tue 3/306:30
BFS
-
ORD
2 stops16h 50m
Multiple Airlines
Deal found 10/2£467
Tue 24/220:35
ORD
-
BHD
1 stop12h 15m
American Airlines
Tue 3/308:45
BHD
-
ORD
1 stop12h 40m
American Airlines
Deal found 10/2£481
Wed 8/416:36
ORD
-
BHD
2 stops14h 59m
British Airways
Wed 15/410:05
BHD
-
ORD
1 stop11h 50m
British Airways
Deal found 11/2£485
Wed 8/420:35
ORD
-
BHD
1 stop11h 00m
American Airlines
Wed 15/406:30
BHD
-
ORD
1 stop17h 05m
American Airlines
Deal found 11/2£487
Wed 14/1009:40
ORD
-
BHD
2 stops17h 10m
British Airways
Thu 22/1012:45
BHD
-
ORD
2 stops28h 25m
British Airways
Deal found 12/2£492
Sun 29/319:05
ORD
-
BHD
1 stop31h 45m
British Airways
Thu 9/406:30
BHD
-
ORD
1 stop15h 25m
British Airways
Deal found 12/2£496
Tue 18/821:35
STL
-
BHD
1 stop15h 20m
British Airways
Tue 25/809:40
BHD
-
STL
1 stop15h 50m
British Airways
Deal found 12/2£502
Mon 30/316:50
ORD
-
BHD
1 stop18h 05m
Delta
Thu 9/417:30
BHD
-
ORD
1 stop26h 45m
Delta
Deal found 12/2£504
Sun 29/310:40
ORD
-
BHD
2 stops16h 40m
Delta
Tue 14/417:30
BHD
-
ORD
1 stop27h 00m
Delta
Deal found 12/2£508
Tue 24/214:12
ORD
-
BHD
2 stops20h 38m
Multiple Airlines
Tue 3/306:30
BHD
-
ORD
2 stops17h 23m
Multiple Airlines
Deal found 10/2£509
Mon 30/317:00
ORD
-
BHD
1 stop14h 40m
British Airways
Mon 13/419:35
BHD
-
ORD
1 stop24h 15m
British Airways
Deal found 12/2£510

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 14 February 2026.

Round-trip from

£443

One-way from

£174
3/3-7/3
  • 3/3-7/3
  • 4 total stops
  • 30h 15m total
  • Illinois to Belfast
Search Deals
26/4
  • 26/4
  • 2 total stops
  • 20h 25m 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 14 February 2026.
Use the filters below to find and compare flights from Illinois to Belfast that are best for you.

Fly from

Illinois

Fly to

Belfast

Route

Depart

Return

Price

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 3/3

18:30-13:25

2 stops12h 55m

Belfast Intl

Sat 7/3

06:00-17:20

2 stops17h 20m

£443

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 24/2

18:30-13:25

2 stops12h 55m

Belfast Intl

Tue 3/3

06:30-17:20

2 stops16h 50m

£467

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 24/2

20:35-14:50

1 stop12h 15m

Belfast City

Tue 3/3

08:45-15:25

1 stop12h 40m

£481

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 8/4

20:35-13:35

1 stop11h 00m

Belfast City

Wed 15/4

06:30-17:35

1 stop17h 05m

£487

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Sun 29/3

21:15-08:50

1 stop29h 35m

Belfast City

Tue 14/4

18:20-13:50

1 stop25h 30m

£496

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Sun 29/3

19:05-08:50

1 stop31h 45m

Belfast City

Mon 13/4

19:35-13:50

1 stop24h 15m

£496

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 8/4

16:36-13:35

2 stops14h 59m

Belfast City

Wed 15/4

10:05-22:00

2 stops17h 55m

£501

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Mon 30/3

16:50-16:55

1 stop18h 05m

Belfast City

Tue 14/4

17:30-14:30

1 stop27h 00m

£504

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Mon 30/3

16:50-16:55

1 stop18h 05m

Belfast City

Thu 9/4

17:30-14:15

1 stop26h 45m

£504

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Sun 29/3

10:40-09:20

2 stops16h 40m

Belfast City

Thu 9/4

17:30-14:15

1 stop26h 45m

£508

Flights are sorted by cheapest return flights first.

Deals found on 11/2

Showing 1-10 of 42 results
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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 £481, American Airlines can have you in Belfast from Illinois in 12h 15m. Airlines will cover a distance of 3644 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 Lambert-St Louis - Belfast Intl.

  • 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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