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Cheap flights from St. Louis to Belfast from £891

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Belfast departing on 12/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags
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Find the cheapest flights from St. Louis to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:10 - 22:20
STL
-
BFS
28h 10m
3 stops
Multiple Airlines Logo
22:45 - 14:02
BFS
-
STL
21h 17m
2 stops
£891Multiple Airlines
Wed, 12 Aug - Wed, 19 Aug
Multiple Airlines Logo
12:10 - 19:15
STL
-
BFS
25h 05m
2 stops
Multiple Airlines Logo
22:45 - 20:24
BFS
-
STL
27h 39m
2 stops
£893Multiple Airlines
Wed, 12 Aug - Wed, 19 Aug
Multiple Airlines Logo
12:10 - 22:20
STL
-
BFS
28h 10m
3 stops
Multiple Airlines Logo
22:45 - 18:42
BFS
-
STL
25h 57m
3 stops
£898Multiple Airlines
Wed, 12 Aug - Wed, 19 Aug
Multiple Airlines Logo
08:55 - 19:15
STL
-
BFS
28h 20m
2 stops
Multiple Airlines Logo
07:35 - 22:59
BFS
-
STL
21h 24m
3 stops
£936Multiple Airlines
Wed, 12 Aug - Wed, 19 Aug
Multiple Airlines Logo
12:10 - 16:30
STL
-
BFS
22h 20m
2 stops
Multiple Airlines Logo
07:20 - 20:24
BFS
-
STL
19h 04m
2 stops
£966Multiple Airlines
Fri, 14 Aug - Fri, 21 Aug
Multiple Airlines Logo
08:55 - 20:15
STL
-
BFS
29h 20m
3 stops
Multiple Airlines Logo
07:35 - 22:59
BFS
-
STL
21h 24m
3 stops
£966Multiple Airlines
Wed, 12 Aug - Wed, 19 Aug
Multiple Airlines Logo
12:10 - 21:15
STL
-
BFS
27h 05m
3 stops
Multiple Airlines Logo
07:20 - 20:24
BFS
-
STL
19h 04m
2 stops
£969Multiple Airlines
Fri, 14 Aug - Fri, 21 Aug
Multiple Airlines Logo
12:10 - 21:15
STL
-
BFS
27h 05m
3 stops
Multiple Airlines Logo
07:20 - 22:59
BFS
-
STL
21h 39m
3 stops
£1,050Multiple Airlines
Fri, 14 Aug - Fri, 21 Aug
KLM Logo
18:09 - 16:55
STL
-
BHD
16h 46m
2 stops
KLM Logo
09:50 - 20:37
BHD
-
STL
16h 47m
2 stops
£1,256KLM
Mon, 20 Jul - Sat, 25 Jul
British Airways Logo
14:31 - 15:30
STL
-
BHD
18h 59m
2 stops
British Airways Logo
19:05 - 19:30
BHD
-
STL
30h 25m
1 stop
£2,157British Airways
Mon, 20 Jul - Sat, 25 Jul

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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, momondo users made 279,928 searches. Data last updated 1 July 2026.
Use the filters below to find and compare flights from St. Louis to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 12/8

12:10-22:20

3 stops28h 10m

Belfast Intl

Wed 19/8

22:45-14:02

2 stops21h 17m

£891

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 12/8

12:10-19:15

2 stops25h 05m

Belfast Intl

Wed 19/8

22:45-20:24

2 stops27h 39m

£893

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 12/8

12:10-22:20

3 stops28h 10m

Belfast Intl

Wed 19/8

22:45-18:42

3 stops25h 57m

£898

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 12/8

08:55-19:15

2 stops28h 20m

Belfast Intl

Wed 19/8

07:35-22:59

3 stops21h 24m

£936

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 14/8

12:10-16:30

2 stops22h 20m

Belfast Intl

Fri 21/8

07:20-20:24

2 stops19h 04m

£966

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 12/8

08:55-20:15

3 stops29h 20m

Belfast Intl

Wed 19/8

07:35-22:59

3 stops21h 24m

£966

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 14/8

12:10-21:15

3 stops27h 05m

Belfast Intl

Fri 21/8

07:20-20:24

2 stops19h 04m

£969

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 14/8

12:10-21:15

3 stops27h 05m

Belfast Intl

Fri 21/8

07:20-22:59

3 stops21h 39m

£1,050
Fastest return journey

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 20/7

18:09-16:55

2 stops16h 46m

Belfast City

Sat 25/7

09:50-20:37

2 stops16h 47m

£1,256

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 20/7

14:31-15:30

2 stops18h 59m

Belfast City

Sat 25/7

19:05-19:30

1 stop30h 25m

£2,157

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

Cheap St. Louis to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Belfast

Fastest flight time

16h 46m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 16h 46m
There are no direct flights from St. Louis to Belfast. There are no popular flight routes from St. Louis to Belfast.
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Frequently asked questions about flying from St. Louis to Belfast

  • How far is Lambert-St Louis to Belfast by plane?

    Belfast is 3891.1 mi away from Lambert-St Louis. By plane, this route typically takes 16h 46m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Belfast?

    Prices for flights from Lambert-St Louis Airport to Belfast are refreshed on a daily basis.

  • How old do you have to be to fly from Lambert-St Louis Airport to Belfast?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Belfast.

  • What documentation or ID do you need to fly to Belfast?

    The travel and health documents required for your trip to Belfast can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belfast. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Frequently asked questions about flying from St. Louis to Belfast

  • How do I get Price Alerts for flights from St. Louis to Belfast?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Belfast. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from St. Louis to Belfast with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Belfast?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Belfast. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Belfast with flexible booking policies on momondo?

Flights from St. Louis to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Belfast?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Belfast.

I’m not ready to book a flight from St. Louis to Belfast right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Belfast from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport