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Cheap flights from St. Louis to Belfast from £693

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 6/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap return flights

Enter your travel dates to find the best prices.
American Airlines Logo
13:01 - 10:30
STL
-
BHD
15h 29m
2 stops
American Airlines Logo
11:35 - 23:33
BHD
-
STL
17h 58m
2 stops
£693American Airlines
Sun, 6 Sep - Wed, 16 Sep
British Airways Logo
07:23 - 12:55
STL
-
BHD
23h 32m
2 stops
British Airways Logo
10:05 - 23:38
BHD
-
STL
19h 33m
2 stops
£703British Airways
Mon, 7 Sep - Wed, 16 Sep
Delta Logo
10:55 - 16:55
STL
-
BHD
24h 00m
2 stops
Delta Logo
17:30 - 23:01
BHD
-
STL
35h 31m
2 stops
£708Delta
Tue, 8 Sep - Wed, 16 Sep
British Airways Logo
07:23 - 12:55
STL
-
BHD
23h 32m
2 stops
British Airways Logo
11:35 - 19:30
BHD
-
STL
13h 55m
1 stop
£720British Airways
Mon, 7 Sep - Wed, 16 Sep
British Airways Logo
13:37 - 10:30
STL
-
BHD
14h 53m
2 stops
British Airways Logo
09:40 - 23:38
BHD
-
STL
19h 58m
2 stops
£726British Airways
Sun, 6 Sep - Tue, 15 Sep
KLM Logo
13:30 - 09:20
STL
-
BHD
13h 50m
2 stops
KLM Logo
09:50 - 23:37
BHD
-
STL
19h 47m
2 stops
£731KLM
Sun, 6 Sep - Thu, 17 Sep
British Airways Logo
21:35 - 08:45
STL
-
BHD
29h 10m
1 stop
British Airways Logo
11:35 - 19:30
BHD
-
STL
13h 55m
1 stop
£737British Airways
Wed, 9 Sep - Wed, 16 Sep
Delta Logo
15:42 - 16:55
STL
-
BHD
19h 13m
2 stops
Delta Logo
09:45 - 16:55
BHD
-
STL
37h 10m
2 stops
£751Delta
Tue, 8 Sep - Sun, 13 Sep
Multiple Airlines Logo
17:45 - 16:55
STL
-
BHD
17h 10m
2 stops
Multiple Airlines Logo
17:30 - 15:57
BHD
-
STL
28h 27m
2 stops
£768Multiple Airlines
Sat, 5 Sep - Wed, 16 Sep
Multiple Airlines Logo
07:05 - 15:00
STL
-
BFS
25h 55m
3 stops
Multiple Airlines Logo
22:00 - 17:05
BFS
-
STL
25h 05m
3 stops
£1,097Multiple Airlines
Sun, 10 May - Sun, 17 May

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
7 Sept
STL07:23Lambert-St Louis
23h 32m
2 stops
BHD12:55Belfast City
16 Sept
BHD10:05Belfast City
19h 33m
2 stops
STL23:38Lambert-St Louis
£703
British Airways
7 Sept
STL07:23Lambert-St Louis
23h 32m
2 stops
BHD12:55Belfast City
16 Sept
BHD11:35Belfast City
13h 55m
1 stop
STL19:30Lambert-St Louis
£720
British Airways
6 Sept
STL13:37Lambert-St Louis
14h 53m
2 stops
BHD10:30Belfast City
15 Sept
BHD09:40Belfast City
19h 58m
2 stops
STL23:38Lambert-St Louis
£726

Delta flights from St. Louis to Belfast

Our best Delta deals on St. Louis to Belfast flight tickets
Delta
8 Sept
STL10:55Lambert-St Louis
24h 00m
2 stops
BHD16:55Belfast City
16 Sept
BHD17:30Belfast City
35h 31m
2 stops
STL23:01Lambert-St Louis
£708
Delta
8 Sept
STL15:42Lambert-St Louis
19h 13m
2 stops
BHD16:55Belfast City
13 Sept
BHD09:45Belfast City
37h 10m
2 stops
STL16:55Lambert-St Louis
£751
Delta
8 Sept
STL16:13Lambert-St Louis
18h 42m
2 stops
BHD16:55Belfast City
14 Sept
BHD17:30Belfast City
29h 19m
2 stops
STL16:49Lambert-St Louis
£815

momondo 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, momondo users made 279,928 searches. Data last updated 30 March 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
Fastest return journey

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 6/9

13:01-10:30

2 stops15h 29m

Belfast City

Wed 16/9

11:35-23:33

2 stops17h 58m

£693

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/9

07:23-12:55

2 stops23h 32m

Belfast City

Wed 16/9

10:05-23:38

2 stops19h 33m

£703

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 8/9

10:55-16:55

2 stops24h 00m

Belfast City

Wed 16/9

17:30-23:01

2 stops35h 31m

£708

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/9

07:23-12:55

2 stops23h 32m

Belfast City

Wed 16/9

11:35-19:30

1 stop13h 55m

£720

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 6/9

13:37-10:30

2 stops14h 53m

Belfast City

Tue 15/9

09:40-23:38

2 stops19h 58m

£726

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 6/9

13:30-09:20

2 stops13h 50m

Belfast City

Thu 17/9

09:50-23:37

2 stops19h 47m

£731

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 9/9

21:35-08:45

1 stop29h 10m

Belfast City

Wed 16/9

11:35-19:30

1 stop13h 55m

£737

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 8/9

15:42-16:55

2 stops19h 13m

Belfast City

Sun 13/9

09:45-16:55

2 stops37h 10m

£751

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sat 5/9

17:45-16:55

2 stops17h 10m

Belfast City

Wed 16/9

17:30-15:57

2 stops28h 27m

£768

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 10/5

07:05-15:00

3 stops25h 55m

Belfast Intl

Sun 17/5

22:00-17:05

3 stops25h 05m

£1,097

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

14h 52m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 14h 52m
There are no direct flights from St. Louis to Belfast. There are no popular flight routes from St. Louis to Belfast.
Search flight deals

  • 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 14h 52m.

  • 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.

  • 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