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Cheap flights from St. Louis to Belfast from $737

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Belfast departing on 8/16. 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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0 bags

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Find the cheapest flights from St. Louis to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
3:33 pm - 2:35 pm
STL
-
BHD
17h 02m
2 stops
British Airways Logo
7:05 pm - 7:30 pm
BHD
-
STL
30h 25m
1 stop
$737British Airways
Sun, Aug 16 - Sat, Aug 22
British Airways Logo
3:33 pm - 2:35 pm
STL
-
BHD
17h 02m
2 stops
British Airways Logo
9:35 am - 7:14 pm
BHD
-
STL
15h 39m
2 stops
$740British Airways
Sun, Aug 16 - Sat, Aug 22
British Airways Logo
9:40 pm - 2:35 pm
STL
-
BHD
10h 55m
1 stop
British Airways Logo
7:05 pm - 7:30 pm
BHD
-
STL
30h 25m
1 stop
$768British Airways
Sun, Aug 16 - Sat, Aug 22
Multiple Airlines Logo
3:30 pm - 9:15 pm
STL
-
BFS
23h 45m
3 stops
Multiple Airlines Logo
4:45 pm - 7:33 pm
BFS
-
STL
32h 48m
3 stops
$1,230Multiple Airlines
Fri, Apr 3 - Fri, Apr 10
Multiple Airlines Logo
8:55 am - 2:55 pm
STL
-
BHD
24h 00m
3 stops
Multiple Airlines Logo
6:30 pm - 1:25 pm
BHD
-
STL
24h 55m
2 stops
$1,353Multiple Airlines
Sun, Aug 16 - Sat, Aug 22
Multiple Airlines Logo
8:55 am - 2:55 pm
STL
-
BHD
24h 00m
3 stops
Multiple Airlines Logo
5:55 pm - 6:27 pm
BHD
-
STL
30h 32m
3 stops
$2,309Multiple Airlines
Sun, Aug 16 - Sat, Aug 22
Multiple Airlines Logo
3:30 pm - 5:05 pm
STL
-
BFS
19h 35m
3 stops
Multiple Airlines Logo
12:25 pm - 3:24 pm
BFS
-
STL
32h 59m
3 stops
$2,347Multiple Airlines
Wed, Apr 1 - Wed, Apr 8
Multiple Airlines Logo
3:30 pm - 3:20 pm
STL
-
BFS
17h 50m
2 stops
Multiple Airlines Logo
12:25 pm - 3:24 pm
BFS
-
STL
32h 59m
3 stops
$2,421Multiple Airlines
Wed, Apr 1 - Wed, Apr 8

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Aug 16
STL3:33 pmLambert-St Louis
17h 02m
2 stops
BHD2:35 pmBelfast City
Aug 22
BHD7:05 pmBelfast City
30h 25m
1 stop
STL7:30 pmLambert-St Louis
$737
British Airways
Aug 16
STL3:33 pmLambert-St Louis
17h 02m
2 stops
BHD2:35 pmBelfast City
Aug 22
BHD9:35 amBelfast City
15h 39m
2 stops
STL7:14 pmLambert-St Louis
$740
British Airways
Aug 16
STL9:40 pmLambert-St Louis
10h 55m
1 stop
BHD2:35 pmBelfast City
Aug 22
BHD7:05 pmBelfast City
30h 25m
1 stop
STL7:30 pmLambert-St Louis
$768

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated February 18, 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

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/16

3:33 pm-2:35 pm

2 stops17h 02m

Belfast City

Sat 8/22

7:05 pm-7:30 pm

1 stop30h 25m

$737

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/16

3:33 pm-2:35 pm

2 stops17h 02m

Belfast City

Sat 8/22

9:35 am-7:14 pm

2 stops15h 39m

$740

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/16

9:40 pm-2:35 pm

1 stop10h 55m

Belfast City

Sat 8/22

7:05 pm-7:30 pm

1 stop30h 25m

$768

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 4/3

3:30 pm-9:15 pm

3 stops23h 45m

Belfast Intl

Fri 4/10

4:45 pm-7:33 pm

3 stops32h 48m

$1,230

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/16

8:55 am-2:55 pm

3 stops24h 00m

Belfast City

Sat 8/22

6:30 pm-1:25 pm

2 stops24h 55m

$1,353

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/16

8:55 am-2:55 pm

3 stops24h 00m

Belfast City

Sat 8/22

5:55 pm-6:27 pm

3 stops30h 32m

$2,309

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 4/1

3:30 pm-5:05 pm

3 stops19h 35m

Belfast Intl

Wed 4/8

12:25 pm-3:24 pm

3 stops32h 59m

$2,347

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 4/1

3:30 pm-3:20 pm

2 stops17h 50m

Belfast Intl

Wed 4/8

12:25 pm-3:24 pm

3 stops32h 59m

$2,421

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/6

1:26 pm-7:25 pm

2 stops23h 59m

$796

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 7/6

10:45 am-11:55 am

3 stops19h 10m

$1,339

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Belfast from

How to get the cheapest flight ticket from St. Louis to Belfast

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Lambert-St Louis to Belfast?

British Airways is the most popular carrier operating from Lambert-St Louis to Belfast

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

17h 02m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 17h 02m
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?

    The straight-line distance from Lambert-St Louis to Belfast is 3891.1 mi. Flights usually cover this in 17h 02m, depending on flying conditions and air traffic around both airports.

  • 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?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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.

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from St. Louis.

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

Yes. momondo allows you to filter the results for St. Louis to Belfast flights to just show those with flexible booking policies.

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

Once all potential St. Louis to Belfast flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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