Find flights
When to book
FAQs

Cheap flights from Illinois to Belfast from £302

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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
28 Aug — 4 Sep1
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 29 July 2026.

Wed 9/919:25
ORD
-
BFS
2 stops15h 40m
Multiple Airlines
Wed 16/907:35
BFS
-
ORD
2 stops19h 50m
Multiple Airlines
Deal found 26/7£553
Mon 7/919:25
ORD
-
BFS
2 stops19h 15m
Multiple Airlines
Mon 14/921:25
BFS
-
ORD
3 stops28h 23m
Multiple Airlines
Deal found 26/7£567
Tue 8/922:25
ORD
-
BHD
2 stops13h 25m
Multiple Airlines
Tue 15/912:50
BHD
-
ORD
3 stops38h 35m
Multiple Airlines
Deal found 24/7£600
Tue 8/919:25
ORD
-
BFS
2 stops18h 15m
Multiple Airlines
Tue 15/908:00
BFS
-
ORD
3 stops40h 15m
Multiple Airlines
Deal found 24/7£602
Wed 9/919:25
ORD
-
BHD
3 stops19h 05m
Multiple Airlines
Wed 16/912:45
BHD
-
ORD
3 stops29h 55m
Multiple Airlines
Deal found 26/7£627
Tue 1/1218:30
ORD
-
BHD
2 stops16h 25m
Multiple Airlines
Tue 8/1212:05
BHD
-
ORD
3 stops34h 50m
Multiple Airlines
Deal found 26/7£636
Tue 1/1217:10
ORD
-
BHD
1 stop11h 20m
British Airways
Wed 9/1212:25
BHD
-
ORD
1 stop12h 20m
British Airways
Deal found 27/7£645
Tue 1/1217:10
ORD
-
BHD
1 stop12h 20m
British Airways
Tue 8/1206:35
BHD
-
ORD
1 stop13h 10m
British Airways
Deal found 26/7£652
Sun 29/1121:50
ORD
-
BHD
1 stop14h 50m
British Airways
Thu 3/1217:45
BHD
-
ORD
1 stop26h 00m
British Airways
Deal found 28/7£665
Wed 9/917:37
MDW
-
BHD
2 stops17h 18m
Delta
Wed 16/909:50
BHD
-
MDW
2 stops18h 54m
Delta
Deal found 26/7£730
Tue 8/909:29
MDW
-
BHD
2 stops17h 51m
Delta
Tue 15/909:50
BHD
-
MDW
2 stops18h 54m
Delta
Deal found 24/7£730
Sat 12/911:45
MDW
-
BFS
3 stops28h 55m
Multiple Airlines
Sat 19/906:20
BFS
-
MDW
3 stops38h 15m
Multiple Airlines
Deal found 28/7£745

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 29 July 2026.

Round-trip from

£553

One-way from

£302
9/9-16/9
  • 9/9-16/9
  • 4 total stops
  • 35h 30m total
  • Illinois to Belfast
Search Deals
11/9
  • 11/9
  • 2 total stops
  • 51h 20m 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 29 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

Wed 9/9

22:25-17:05

2 stops12h 40m

Belfast Intl

Wed 16/9

09:35-12:40

2 stops33h 05m

£579

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 1/12

18:30-20:55

2 stops20h 25m

Belfast Intl

Wed 9/12

10:40-17:20

3 stops36h 40m

£587

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 7/9

22:25-22:00

3 stops17h 35m

Belfast Intl

Mon 14/9

21:25-19:48

3 stops28h 23m

£606

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 8/9

22:25-19:40

2 stops15h 15m

Belfast Intl

Tue 15/9

07:00-21:25

3 stops44h 25m

£622

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 1/12

14:35-11:30

2 stops14h 55m

Belfast City

Wed 9/12

11:25-21:00

2 stops15h 35m

£656

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Sun 29/11

21:50-18:40

1 stop14h 50m

Belfast City

Thu 3/12

17:45-13:45

1 stop26h 00m

£665

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

£665

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 12/9

19:25-18:35

2 stops17h 10m

Belfast Intl

Sat 19/9

18:10-15:10

2 stops27h 00m

£677

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 9/9

19:25-19:40

2 stops18h 15m

Belfast City

Wed 16/9

12:45-12:40

3 stops29h 55m

£690
Fastest return journey

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 9/9

21:15-15:40

1 stop12h 25m

Belfast City

Wed 16/9

06:30-13:50

1 stop13h 20m

£706

Flights are sorted by cheapest return flights first.

Deals found on 28/7

Showing 1-10 of 36 resultsSorted by cheapest first
1
2
3
4

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 £656, British Airways can have you in Belfast from Illinois in 14h 55m. 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

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.