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Cheap flights from Illinois to Belfast from £173

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 15/2. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
14 Feb — 21 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Belfast

Keep the following information in mind while searching for Illinois to Belfast flight deals. Data was last updated 15 January 2026.

Round-trip from

£427

One-way from

£173
British Airways
  • British Airways
  • 10/2-17/2
  • 4 total stops
  • 39h 34m total
  • Illinois to Belfast
Search Deals
15/2
  • 15/2
  • 2 total stops
  • 21h 05m total
  • Illinois to Belfast
Search Deals

Find 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 15 January 2026.

Tue 10/209:33
STL
-
BHD
2 stops18h 57m
British Airways
Tue 17/208:45
BHD
-
STL
2 stops20h 37m
British Airways
Deal found 13/1£427
Tue 3/1116:40
ORD
-
BHD
2 stops16h 10m
British Airways
Tue 10/1110:00
BHD
-
ORD
1 stop14h 45m
British Airways
Deal found 14/1£437
Wed 18/318:54
ORD
-
BHD
2 stops14h 21m
British Airways
Sun 22/320:25
BHD
-
ORD
2 stops45h 00m
British Airways
Deal found 14/1£463
Wed 4/321:45
ORD
-
BHD
1 stop12h 50m
British Airways
Sun 8/320:25
BHD
-
ORD
1 stop28h 20m
British Airways
Deal found 13/1£466
Fri 1/521:15
ORD
-
BHD
1 stop12h 15m
British Airways
Wed 6/506:30
BHD
-
ORD
1 stop15h 25m
British Airways
Deal found 14/1£476
Wed 25/214:19
STL
-
BHD
2 stops13h 56m
British Airways
Sun 1/320:25
BHD
-
STL
2 stops30h 47m
British Airways
Deal found 12/1£477
Thu 12/309:48
ORD
-
BHD
2 stops19h 32m
British Airways
Thu 19/306:35
BHD
-
ORD
1 stop18h 10m
British Airways
Deal found 14/1£478
Sun 1/318:30
ORD
-
BFS
2 stops18h 25m
Multiple Airlines
Sun 8/309:25
BFS
-
ORD
3 stops44h 15m
Multiple Airlines
Deal found 15/1£524
Sat 30/515:45
ORD
-
BFS
2 stops22h 55m
Multiple Airlines
Wed 3/608:15
BFS
-
ORD
2 stops20h 57m
Multiple Airlines
Deal found 14/1£649
Thu 12/317:40
MDW
-
BHD
2 stops18h 00m
KLM
Thu 19/306:30
BHD
-
MDW
2 stops16h 24m
KLM
Deal found 14/1£766
Tue 10/211:05
STL
-
BHD
3 stops23h 15m
Aer Lingus
Tue 17/210:40
BHD
-
STL
2 stops19h 08m
Aer Lingus
Deal found 13/1£768
Sat 13/617:00
ORD
-
BFS
2 stops22h 25m
Multiple Airlines
Sun 21/622:10
BFS
-
ORD
2 stops47h 45m
Multiple Airlines
Deal found 14/1£815

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 15 January 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

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 10/2

09:33-10:30

2 stops18h 57m

Belfast City

Tue 17/2

08:45-23:22

2 stops20h 37m

£427

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 18/3

18:54-14:15

2 stops14h 21m

Belfast City

Sun 22/3

20:25-12:25

2 stops45h 00m

£463

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 4/3

21:45-16:35

1 stop12h 50m

Belfast City

Sun 8/3

20:25-19:45

1 stop28h 20m

£466

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 25/2

14:19-10:15

2 stops13h 56m

Belfast City

Sun 1/3

20:25-21:12

2 stops30h 47m

£477

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Thu 12/3

09:48-10:20

2 stops19h 32m

Belfast City

Thu 19/3

06:35-19:45

1 stop18h 10m

£478

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 6/2

17:10-21:00

2 stops21h 50m

Belfast City

Tue 10/2

15:05-13:50

1 stop28h 45m

£492

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 1/3

18:30-18:55

2 stops18h 25m

Belfast Intl

Sun 8/3

09:25-00:40

3 stops44h 15m

£524

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 30/5

15:45-20:40

2 stops22h 55m

Belfast Intl

Wed 3/6

08:15-23:12

2 stops20h 57m

£649

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Thu 12/3

17:40-16:40

2 stops18h 00m

Belfast City

Thu 19/3

06:30-17:54

2 stops16h 24m

£766

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Thu 12/3

17:40-16:40

2 stops18h 00m

Belfast City

Thu 19/3

06:30-17:54

2 stops16h 24m

£766

Flights are sorted by cheapest return flights first.

Deals found on 13/1

Showing 1-10 of 20 results
1
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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 £766, British Airways can have you in Belfast from Illinois in 18h. 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 City. You may also consider Chicago Midway - Belfast City or Lambert-St Louis - 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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Fly with Cheapflights

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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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