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Cheap flights from St. Louis to Belfast from £504

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 19/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BHD
14 Mar — 21 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from St. Louis to Belfast

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to Belfast
Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 12 February 2026.

Wed 19/813:30
STL
-
BHD
2 stops18h 05m
British Airways
Wed 26/810:05
BHD
-
STL
2 stops19h 37m
British Airways
Deal found 9/2£504
Tue 18/821:35
STL
-
BHD
1 stop14h 00m
British Airways
Tue 25/813:45
BHD
-
STL
1 stop11h 45m
British Airways
Deal found 9/2£505
Sun 16/821:40
STL
-
BHD
1 stop16h 55m
British Airways
Mon 24/818:30
BHD
-
STL
1 stop31h 00m
British Airways
Deal found 9/2£513
Tue 18/821:35
STL
-
BHD
1 stop11h 45m
British Airways
Wed 26/811:35
BHD
-
STL
2 stops18h 16m
British Airways
Deal found 9/2£523
Mon 9/1114:18
STL
-
BHD
2 stops20h 32m
Delta
Thu 19/1117:20
BHD
-
STL
2 stops29h 46m
Delta
Deal found 9/2£526
Wed 19/821:35
STL
-
BHD
1 stop16h 15m
British Airways
Mon 24/815:20
BHD
-
STL
1 stop34h 10m
British Airways
Deal found 9/2£535
Fri 21/821:35
STL
-
BHD
1 stop14h 35m
British Airways
Mon 24/819:35
BHD
-
STL
1 stop29h 55m
British Airways
Deal found 9/2£542
Wed 19/816:18
STL
-
BHD
2 stops15h 17m
British Airways
Tue 25/809:40
BHD
-
STL
2 stops16h 39m
British Airways
Deal found 9/2£547
Mon 17/817:45
STL
-
BHD
2 stops17h 10m
Delta
Fri 28/809:50
BHD
-
STL
2 stops19h 47m
Delta
Deal found 9/2£550
Sat 28/316:05
STL
-
BFS
3 stops21h 35m
Multiple Airlines
Sat 4/408:20
BFS
-
STL
2 stops35h 05m
Multiple Airlines
Deal found 11/2£1,396
Thu 26/316:05
STL
-
BFS
2 stops16h 35m
Multiple Airlines
Thu 2/408:20
BFS
-
STL
3 stops20h 42m
Multiple Airlines
Deal found 9/2£1,943
Mon 23/316:05
STL
-
BFS
2 stops24h 35m
Multiple Airlines
Sat 28/319:25
BFS
-
STL
2 stops23h 00m
Multiple Airlines
Deal found 11/2£2,557

Find flight deals from St. Louis to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Belfast (BF1). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 12 February 2026.

Round-trip from

£707
British Airways
  • British Airways
  • 23/3-28/3
  • 4 total stops
  • 48h 08m total
  • St. Louis to Belfast
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from St. Louis 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 12 February 2026.
Use the filters below to find and compare flights from St. Louis to Belfast that are best for you.

Fly from

St. Louis

Fly to

Belfast

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 23/3

13:34-10:40

2 stops16h 06m

Belfast City

Sat 28/3

15:05-18:07

2 stops32h 02m

£707

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 25/2

11:59-14:15

2 stops20h 16m

Belfast City

Sun 1/3

12:10-23:48

2 stops17h 38m

£797

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sat 28/3

16:05-18:40

3 stops21h 35m

Belfast Intl

Sat 4/4

08:20-13:25

2 stops35h 05m

£1,396

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 26/3

16:05-13:40

2 stops16h 35m

Belfast Intl

Thu 2/4

08:20-23:02

3 stops20h 42m

£1,943

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 23/3

16:05-21:40

2 stops24h 35m

Belfast Intl

Sat 28/3

19:25-13:25

2 stops23h 00m

£2,557

Flights are sorted by cheapest return flights first.

Deals found on 11/2

Best time to book a flight from St. Louis to Belfast

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

  • What airport do you fly from for flights from St. Louis to Belfast?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Belfast. On average, Lambert-St Louis has 0 outbound flights to Belfast per day from 0 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • How long is the flight from St. Louis to Belfast?

    For as low as £707, British Airways can have you in Belfast from St. Louis in 16h 06m. Airlines will cover a distance of 3893 mi.

  • Can I find deals for flights from St. Louis to Belfast that include hotel bookings?

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

  • How can I find direct flights from St. Louis to Belfast?

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

  • Can I find deals for business class flights from St. Louis to Belfast?

    Yes. Cheapflights offers flight deals from St. Louis 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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Alternative routes for St. Louis to Belfast

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Kansas City to Belfast City flights

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How does Cheapflights help users find flights from St. Louis to Belfast?

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Why should you use Cheapflights to find cheap flight tickets from St. Louis to Belfast?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from St. Louis to Belfast.

Can Cheapflights find flights from St. Louis to Belfast with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from St. Louis to Belfast, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from St. Louis to Belfast become cheaper?

Of course! You can now track prices for flights from St. Louis to Belfast and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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