Find flights
When to book
FAQs

Cheap flights from Illinois to Belfast from £238

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 26/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
28 May — 4 Jun1
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 28 April 2026.

Tue 9/609:55
ORD
-
BFS
2 stops24h 25m
Multiple Airlines
Tue 16/620:15
BFS
-
ORD
3 stops31h 10m
Multiple Airlines
Deal found 25/4£624
Mon 14/921:00
ORD
-
BHD
1 stop12h 30m
American Airlines
Tue 15/1208:45
BHD
-
ORD
1 stop16h 00m
American Airlines
Deal found 27/4£653
Sun 29/1117:10
ORD
-
BHD
1 stop11h 10m
British Airways
Thu 3/1206:35
BHD
-
ORD
1 stop18h 10m
British Airways
Deal found 26/4£655
Mon 14/916:51
ORD
-
BHD
2 stops16h 39m
British Airways
Tue 15/1210:00
BHD
-
ORD
1 stop14h 45m
British Airways
Deal found 27/4£658
Tue 4/821:15
ORD
-
BHD
1 stop14h 20m
British Airways
Thu 20/806:30
BHD
-
ORD
1 stop13h 20m
British Airways
Deal found 27/4£660
Tue 4/821:15
ORD
-
BHD
1 stop14h 20m
Multiple Airlines
Thu 20/806:30
BHD
-
ORD
2 stops16h 25m
Multiple Airlines
Deal found 27/4£662
Sun 23/821:40
STL
-
BHD
1 stop14h 00m
American Airlines
Wed 26/806:30
BHD
-
STL
1 stop19h 00m
American Airlines
Deal found 24/4£670
Mon 14/910:40
ORD
-
BHD
2 stops16h 40m
KLM
Thu 17/909:50
BHD
-
ORD
2 stops20h 07m
KLM
Deal found 24/4£679
Fri 16/1021:35
STL
-
BHD
1 stop14h 35m
British Airways
Tue 20/1009:40
BHD
-
STL
1 stop15h 50m
British Airways
Deal found 23/4£693
Fri 16/1018:51
STL
-
BHD
2 stops17h 19m
Multiple Airlines
Tue 20/1013:45
BHD
-
STL
1 stop11h 45m
Multiple Airlines
Deal found 23/4£714
Tue 5/519:25
ORD
-
BFS
2 stops18h 15m
Multiple Airlines
Tue 12/507:15
BFS
-
ORD
2 stops17h 00m
Multiple Airlines
Deal found 27/4£715
Fri 16/1016:32
STL
-
BHD
2 stops19h 38m
American Airlines
Tue 20/1009:40
BHD
-
STL
2 stops19h 45m
American Airlines
Deal found 23/4£717

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 28 April 2026.

Round-trip from

£624

One-way from

£238
9/6-16/6
  • 9/6-16/6
  • 5 total stops
  • 55h 35m total
  • Illinois to Belfast
Search Deals
British Airways
  • British Airways
  • 8/9
  • 2 total stops
  • 33h 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 28 April 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 9/6

09:55-16:20

2 stops24h 25m

Belfast Intl

Tue 16/6

20:15-21:25

3 stops31h 10m

£624

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Mon 14/9

21:00-15:30

1 stop12h 30m

Belfast City

Tue 15/12

08:45-18:45

1 stop16h 00m

£653

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Mon 14/9

13:59-12:55

2 stops16h 56m

Belfast City

Tue 15/12

08:45-20:34

2 stops17h 49m

£665

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 23/8

20:00-17:40

2 stops15h 40m

Belfast City

Wed 26/8

06:30-19:30

1 stop19h 00m

£673

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Mon 14/9

10:40-09:20

2 stops16h 40m

Belfast City

Thu 17/9

09:50-23:57

2 stops20h 07m

£679

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 4/8

16:30-15:20

2 stops16h 50m

Belfast City

Thu 20/8

09:35-22:07

2 stops18h 32m

£690

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 16/10

21:35-18:10

1 stop14h 35m

Belfast City

Tue 20/10

09:40-19:30

1 stop15h 50m

£693

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 16/10

18:51-18:10

2 stops17h 19m

Belfast City

Tue 20/10

13:45-19:30

1 stop11h 45m

£714

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Tue 4/8

18:58-16:55

2 stops15h 57m

Belfast City

Thu 20/8

09:50-21:46

2 stops17h 56m

£719
Fastest return journey

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Thu 1/10

22:35-19:25

1 stop14h 50m

Belfast City

Sun 4/10

06:30-12:30

1 stop12h 00m

£727

Flights are sorted by cheapest return flights first.

Deals found on 26/4

Showing 1-10 of 50 resultsSorted by cheapest first
1
2
3
...
5

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 £653, American Airlines can have you in Belfast from Illinois in 12h 30m. 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 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.