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Cheap flights from Illinois to Belfast Intl Airport from £237

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 28/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
16 Oct — 23 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Illinois to Belfast Intl

Keep the following information in mind while searching for Illinois to Belfast Intl flight deals. Data was last updated 16 September 2025.

Round-trip from

£429

One-way from

£237
29/9-7/10
  • 29/9-7/10
  • 4 total stops
  • 49h 03m total
  • Illinois to Belfast
Search Deals
28/9
  • 28/9
  • 3 total stops
  • 43h 10m total
  • Illinois to Belfast
Search Deals

Find flight deals from Illinois to Belfast Intl

Cheapest flights from Illinois to Belfast Intl
Explore the most affordable flight options available from Illinois to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.

Mon 29/913:26STL - BFS
2 stops27h 44mMultiple Airlines
Tue 7/1006:45BFS - STL
2 stops21h 19mMultiple Airlines
Deal found 15/9£429
Fri 31/1021:15ORD - BFS
3 stops20h 30mMultiple Airlines
Mon 10/1122:20BFS - ORD
3 stops46h 40mMultiple Airlines
Deal found 14/9£534
Thu 16/1018:00ORD - BFS
3 stops23h 25mMultiple Airlines
Sat 25/1006:00BFS - ORD
3 stops39h 45mMultiple Airlines
Deal found 14/9£542
Mon 29/906:30ORD - BFS
2 stops31h 55mMultiple Airlines
Thu 2/1016:25BFS - ORD
3 stops30h 05mMultiple Airlines
Deal found 15/9£559
Sat 27/908:40ORD - BFS
3 stops26h 30mMultiple Airlines
Thu 2/1016:25BFS - ORD
3 stops30h 05mMultiple Airlines
Deal found 15/9£577
Fri 26/919:25ORD - BFS
2 stops20h 55mMultiple Airlines
Wed 1/1021:05BFS - ORD
2 stops27h 10mMultiple Airlines
Deal found 15/9£590
Sun 28/906:30ORD - BFS
2 stops31h 50mMultiple Airlines
Thu 2/1016:25BFS - ORD
3 stops30h 05mMultiple Airlines
Deal found 15/9£609
Sun 28/919:25ORD - BFS
2 stops20h 55mMultiple Airlines
Wed 1/1017:20BFS - ORD
2 stops25h 15mMultiple Airlines
Deal found 15/9£615
Thu 30/1019:30ORD - BFS
2 stops12h 05mMultiple Airlines
Mon 10/1122:20BFS - ORD
3 stops46h 40mMultiple Airlines
Deal found 14/9£621
Wed 29/1016:50STL - BFS
2 stops18h 20mMultiple Airlines
Wed 5/1120:50BFS - STL
3 stops47h 05mMultiple Airlines
Deal found 14/9£1,381
Mon 29/909:35MDW - BFS
3 stops29h 20mMultiple Airlines
Thu 2/1007:10BFS - MDW
3 stops31h 29mMultiple Airlines
Deal found 16/9£1,569

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois to Belfast Intl 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 16 September 2025.
Use the filters below to find and compare flights from Illinois to Belfast Intl Airport that are best for you.

Fly from

Illinois

Fly to

Belfast Intl

Route

Depart

Return

Price

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 29/9

13:26-23:10

2 stops27h 44m

Belfast Intl

Tue 7/10

06:45-22:04

2 stops21h 19m

£429

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 16/10

18:00-23:25

3 stops23h 25m

Belfast Intl

Sat 25/10

06:00-15:45

3 stops39h 45m

£542

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 30/10

19:50-22:20

2 stops21h 30m

Belfast Intl

Thu 6/11

14:25-16:20

2 stops31h 55m

£559

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 27/9

08:40-17:10

3 stops26h 30m

Belfast Intl

Thu 2/10

16:25-16:30

3 stops30h 05m

£577

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 28/9

06:30-20:20

2 stops31h 50m

Belfast Intl

Thu 2/10

16:25-16:30

3 stops30h 05m

£609

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 30/10

19:30-12:35

2 stops12h 05m

Belfast Intl

Mon 10/11

22:20-15:00

3 stops46h 40m

£621

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sun 28/9

19:15-23:20

3 stops22h 05m

Belfast Intl

Wed 1/10

17:20-12:35

2 stops25h 15m

£622

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Mon 29/9

12:00-13:15

3 stops19h 15m

Belfast Intl

Thu 2/10

16:25-16:30

3 stops30h 05m

£658

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 26/9

10:23-22:20

3 stops29h 57m

Belfast Intl

Wed 1/10

17:20-12:35

2 stops25h 15m

£683

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 30/10

10:00-22:05

2 stops31h 05m

Belfast Intl

Sun 2/11

05:30-20:00

2 stops19h 30m

£686

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 13 results
1
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Best time to book a flight from Illinois to Belfast Intl

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl 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 Intl Airport
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 Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the most popular routes from Illinois to Belfast Intl Airport?

    While some choose either Chicago Midway - Belfast Intl or Lambert-St Louis - Belfast Intl, Chicago O'Hare Intl - Belfast Intl is the most popular route from Illinois to Belfast Intl Airport.

  • Can I find deals for flights from Illinois to Belfast Intl that include hotel bookings?

    Yes. In addition to deals on Illinois to Belfast Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Belfast Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Belfast Intl.

  • Can I find deals for business class flights from Illinois to Belfast Intl?

    Yes. Cheapflights offers flight deals from Illinois to Belfast Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to Belfast Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Illinois to Belfast Intl Airport (average of £67). Flying from Illinois to Belfast Intl Airport in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Belfast Intl Airport?

Book flights to Belfast Intl Airport if you plan to visit one of these locations
Armagh
Newry
Ballymena
Cookstown
Dungannon

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Fly with Cheapflights

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How does Cheapflights help users find flights from Illinois to Belfast Intl?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Illinois to Belfast Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Belfast Intl?

Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Belfast Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Illinois to Belfast Intl with no change fees?

Yes! Cheapflights helps users easily find flights from Illinois to Belfast Intl with no change fees.

Can Cheapflights notify me if prices for flights from Illinois to Belfast Intl become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Belfast Intl from Illinois today and book when prices fit your budget.

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