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Cheap flights from Illinois to Belfast from £232

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 20/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
21 May — 28 May1
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 21 April 2026.

Tue 2/609:55
ORD
-
BFS
2 stops27h 45m
Multiple Airlines
Tue 9/620:15
BFS
-
ORD
3 stops31h 10m
Multiple Airlines
Deal found 18/4£600
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£619
Wed 28/1019:50
ORD
-
BHD
1 stop13h 25m
American Airlines
Tue 3/1106:35
BHD
-
ORD
1 stop14h 45m
American Airlines
Deal found 19/4£655
Sun 6/1221:45
ORD
-
BHD
1 stop14h 55m
British Airways
Thu 10/1220:00
BHD
-
ORD
1 stop23h 50m
British Airways
Deal found 19/4£657
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£663
Sun 23/821:40
STL
-
BHD
1 stop15h 05m
British Airways
Wed 26/811:35
BHD
-
STL
1 stop13h 55m
British Airways
Deal found 16/4£673
Tue 26/509:55
ORD
-
BFS
2 stops27h 45m
Multiple Airlines
Sun 31/507:10
BFS
-
ORD
3 stops37h 20m
Multiple Airlines
Deal found 18/4£674
Wed 28/1016:55
ORD
-
BFS
2 stops18h 15m
Multiple Airlines
Tue 3/1106:30
BFS
-
ORD
3 stops39h 00m
Multiple Airlines
Deal found 19/4£686
Thu 22/1017:00
ORD
-
BHD
1 stop11h 10m
British Airways
Tue 27/1019:25
BHD
-
ORD
1 stop24h 25m
British Airways
Deal found 16/4£690
Sun 13/921:15
ORD
-
BHD
1 stop14h 25m
American Airlines
Sun 20/906:30
BHD
-
ORD
1 stop17h 05m
American Airlines
Deal found 17/4£692
Tue 4/818:12
STL
-
BHD
2 stops17h 23m
American Airlines
Thu 13/809:35
BHD
-
STL
2 stops19h 48m
American Airlines
Deal found 19/4£695
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

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 21 April 2026.

Round-trip from

£600

One-way from

£232
2/6-9/6
  • 2/6-9/6
  • 5 total stops
  • 58h 55m total
  • Illinois to Belfast
Search Deals
20/9
  • 20/9
  • 2 total stops
  • 14h 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 21 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

Mon 1/6

10:00-16:15

2 stops24h 15m

Belfast Intl

Mon 8/6

18:50-18:15

3 stops29h 25m

£619

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 23/8

21:40-17:40

1 stop14h 00m

Belfast City

Wed 26/8

11:35-19:30

1 stop13h 55m

£673

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

£715

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 2/6

09:55-19:40

2 stops27h 45m

Belfast Intl

Tue 9/6

05:55-16:59

2 stops17h 04m

£742

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 26/5

19:25-19:50

3 stops18h 25m

Belfast Intl

Sun 31/5

07:00-14:30

3 stops37h 30m

£749

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sat 1/8

15:55-08:40

2 stops34h 45m

Belfast City

Tue 11/8

20:25-23:51

2 stops33h 26m

£785

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 4/9

06:06-18:10

2 stops30h 04m

Belfast City

Fri 11/9

06:30-19:30

1 stop19h 00m

£809

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 13/9

21:00-21:30

2 stops18h 30m

Belfast Intl

Sun 20/9

08:25-18:15

2 stops15h 50m

£821

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Sun 19/7

20:45-17:40

1 stop14h 55m

Belfast City

Sat 25/7

07:05-17:32

2 stops16h 27m

£846

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 4/8

21:35-17:35

1 stop14h 00m

Belfast City

Thu 13/8

20:35-19:30

1 stop28h 55m

£854

Flights are sorted by cheapest return flights first.

Deals found on 16/4

Showing 1-10 of 44 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 £673, British Airways can have you in Belfast from Illinois in 15h 05m. Airlines will cover a distance of 3893 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 Midway - Belfast City or Chicago O'Hare Intl - 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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