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Cheap flights from Illinois to Belfast Intl Airport from £244

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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
3 Jun — 10 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Belfast Intl

Enter your travel dates to find the best prices.

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 4 May 2026.

Sat 13/609:55
ORD
-
BFS
3 stops27h 00m
Multiple Airlines
Sat 20/607:40
BFS
-
ORD
2 stops34h 10m
Multiple Airlines
Deal found 29/4£669
Wed 17/609:55
ORD
-
BFS
2 stops24h 00m
Multiple Airlines
Wed 24/606:15
BFS
-
ORD
3 stops40h 42m
Multiple Airlines
Deal found 3/5£701
Thu 18/608:52
ORD
-
BFS
3 stops31h 33m
Multiple Airlines
Mon 22/620:35
BFS
-
ORD
3 stops29h 41m
Multiple Airlines
Deal found 1/5£831
Fri 12/609:55
ORD
-
BFS
3 stops29h 20m
Multiple Airlines
Fri 19/617:05
BFS
-
ORD
3 stops27h 39m
Multiple Airlines
Deal found 30/4£937
Sun 5/708:55
STL
-
BFS
2 stops23h 40m
Multiple Airlines
Thu 16/721:05
BFS
-
STL
3 stops29h 02m
Multiple Airlines
Deal found 1/5£1,020
Fri 3/708:55
STL
-
BFS
2 stops30h 55m
Multiple Airlines
Fri 17/707:20
BFS
-
STL
2 stops18h 47m
Multiple Airlines
Deal found 30/4£1,057
Wed 1/708:55
STL
-
BFS
2 stops23h 35m
Multiple Airlines
Thu 16/721:05
BFS
-
STL
3 stops29h 02m
Multiple Airlines
Deal found 1/5£1,065
Wed 1/708:55
STL
-
BFS
2 stops23h 35m
Multiple Airlines
Wed 15/705:55
BFS
-
STL
2 stops20h 12m
Multiple Airlines
Deal found 30/4£1,086
Wed 1/708:55
STL
-
BFS
2 stops23h 35m
Multiple Airlines
Fri 17/707:20
BFS
-
STL
2 stops18h 47m
Multiple Airlines
Deal found 30/4£1,103
Sat 4/714:40
STL
-
BFS
2 stops22h 15m
Multiple Airlines
Fri 17/707:20
BFS
-
STL
2 stops18h 47m
Multiple Airlines
Deal found 30/4£1,106

Find 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 4 May 2026.

Round-trip from

£669

One-way from

£244
13/6-20/6
  • 13/6-20/6
  • 5 total stops
  • 61h 10m total
  • Illinois to Belfast
Search Deals
5/9
  • 5/9
  • 2 total stops
  • 19h 15m total
  • Illinois to Belfast
Search Deals

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 4 May 2026.
Use the filters below to find and compare flights from Illinois to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 13/6

09:55-18:55

3 stops27h 00m

Belfast Intl

Sat 20/6

07:40-11:50

2 stops34h 10m

£669

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Wed 17/6

09:55-21:10

2 stops29h 15m

Belfast Intl

Wed 24/6

07:30-22:05

2 stops20h 35m

£726

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Thu 18/6

08:52-22:25

3 stops31h 33m

Belfast Intl

Mon 22/6

20:35-20:16

3 stops29h 41m

£831

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 12/6

09:55-21:15

3 stops29h 20m

Belfast Intl

Fri 19/6

17:05-14:44

3 stops27h 39m

£937

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 5/7

12:10-14:35

3 stops20h 25m

Belfast Intl

Thu 16/7

06:10-14:02

3 stops37h 52m

£1,043

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 3/7

08:55-21:50

2 stops30h 55m

Belfast Intl

Fri 17/7

07:20-20:07

2 stops18h 47m

£1,057

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sat 4/7

08:55-18:55

3 stops28h 00m

Belfast Intl

Fri 17/7

07:20-20:07

2 stops18h 47m

£1,106

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 2/7

08:55-11:50

3 stops20h 55m

Belfast Intl

Thu 16/7

21:05-20:07

3 stops29h 02m

£1,166
Fastest return journey

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 1/7

08:55-14:30

2 stops23h 35m

Belfast Intl

Thu 16/7

21:05-14:02

2 stops22h 57m

£1,396
Cheapest one-way
Fastest single journey

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 5/9

19:25-20:40

2 stops19h 15m

£244

Flights are sorted by cheapest return flights first.

Deals found on 29/4

Showing 1-10 of 18 resultsSorted by cheapest first
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 O'Hare Intl - Belfast Intl or Chicago Midway - Belfast Intl, Lambert-St Louis - 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.

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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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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