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Cheap flights from St. Louis to Belfast from $381

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Belfast departing on 10/16. 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.
American Airlines Logo
9:40 pm - 5:40 pm
STL
-
BHD
14h 00m
1 stop
American Airlines Logo
6:30 am - 7:30 pm
BHD
-
STL
19h 00m
1 stop
$907American Airlines
Sun, Aug 23 - Wed, Aug 26
British Airways Logo
9:40 pm - 2:35 pm
STL
-
BHD
10h 55m
1 stop
British Airways Logo
11:35 am - 7:30 pm
BHD
-
STL
13h 55m
1 stop
$909British Airways
Sun, Aug 23 - Wed, Aug 26
American Airlines Logo
8:00 pm - 5:40 pm
STL
-
BHD
15h 40m
2 stops
American Airlines Logo
6:30 am - 7:30 pm
BHD
-
STL
19h 00m
1 stop
$911American Airlines
Sun, Aug 23 - Wed, Aug 26
American Airlines Logo
8:00 pm - 6:45 pm
STL
-
BHD
16h 45m
2 stops
American Airlines Logo
11:35 am - 11:51 pm
BHD
-
STL
18h 16m
2 stops
$921American Airlines
Sun, Aug 23 - Wed, Aug 26
British Airways Logo
9:35 pm - 6:10 pm
STL
-
BHD
14h 35m
1 stop
British Airways Logo
9:40 am - 7:30 pm
BHD
-
STL
15h 50m
1 stop
$938British Airways
Fri, Oct 16 - Tue, Oct 20
American Airlines Logo
6:12 pm - 5:35 pm
STL
-
BHD
17h 23m
2 stops
American Airlines Logo
9:35 am - 11:23 pm
BHD
-
STL
19h 48m
2 stops
$939American Airlines
Tue, Aug 4 - Thu, Aug 13
Multiple Airlines Logo
6:51 pm - 6:10 pm
STL
-
BHD
17h 19m
2 stops
Multiple Airlines Logo
1:45 pm - 7:30 pm
BHD
-
STL
11h 45m
1 stop
$967Multiple Airlines
Fri, Oct 16 - Tue, Oct 20
British Airways Logo
9:35 pm - 5:35 pm
STL
-
BHD
14h 00m
1 stop
British Airways Logo
9:35 am - 10:25 pm
BHD
-
STL
18h 50m
2 stops
$968British Airways
Tue, Aug 4 - Thu, Aug 13
British Airways Logo
9:35 pm - 6:10 pm
STL
-
BHD
14h 35m
1 stop
British Airways Logo
9:40 am - 10:00 pm
BHD
-
STL
18h 20m
2 stops
$970British Airways
Fri, Oct 16 - Tue, Oct 20
American Airlines Logo
4:32 pm - 6:10 pm
STL
-
BHD
19h 38m
2 stops
American Airlines Logo
9:40 am - 11:25 pm
BHD
-
STL
19h 45m
2 stops
$971American Airlines
Fri, Oct 16 - Tue, Oct 20

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Aug 23
STL9:40 pmLambert-St Louis
10h 55m
1 stop
BHD2:35 pmBelfast City
Aug 26
BHD11:35 amBelfast City
13h 55m
1 stop
STL7:30 pmLambert-St Louis
$909
British Airways
Oct 16
STL9:35 pmLambert-St Louis
14h 35m
1 stop
BHD6:10 pmBelfast City
Oct 20
BHD9:40 amBelfast City
15h 50m
1 stop
STL7:30 pmLambert-St Louis
$938
British Airways
Aug 4
STL9:35 pmLambert-St Louis
14h 00m
1 stop
BHD5:35 pmBelfast City
Aug 13
BHD9:35 amBelfast City
18h 50m
2 stops
STL10:25 pmLambert-St Louis
$968

American Airlines flights from St. Louis to Belfast

Our best American Airlines deals on St. Louis to Belfast flight tickets
American Airlines
Aug 23
STL9:40 pmLambert-St Louis
14h 00m
1 stop
BHD5:40 pmBelfast City
Aug 26
BHD6:30 amBelfast City
19h 00m
1 stop
STL7:30 pmLambert-St Louis
$907
American Airlines
Aug 23
STL8:00 pmLambert-St Louis
15h 40m
2 stops
BHD5:40 pmBelfast City
Aug 26
BHD6:30 amBelfast City
19h 00m
1 stop
STL7:30 pmLambert-St Louis
$911
American Airlines
Aug 23
STL8:00 pmLambert-St Louis
16h 45m
2 stops
BHD6:45 pmBelfast City
Aug 26
BHD11:35 amBelfast City
18h 16m
2 stops
STL11:51 pmLambert-St Louis
$921

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 April 24, 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 round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/23

9:40 pm-5:40 pm

1 stop14h 00m

Belfast City

Wed 8/26

6:30 am-7:30 pm

1 stop19h 00m

$907
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/23

9:40 pm-2:35 pm

1 stop10h 55m

Belfast City

Wed 8/26

11:35 am-7:30 pm

1 stop13h 55m

$909

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/23

8:00 pm-5:40 pm

2 stops15h 40m

Belfast City

Wed 8/26

6:30 am-7:30 pm

1 stop19h 00m

$911

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 8/23

8:00 pm-6:45 pm

2 stops16h 45m

Belfast City

Wed 8/26

11:35 am-11:51 pm

2 stops18h 16m

$921

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 10/16

9:35 pm-6:10 pm

1 stop14h 35m

Belfast City

Tue 10/20

9:40 am-7:30 pm

1 stop15h 50m

$938

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 8/4

6:12 pm-5:35 pm

2 stops17h 23m

Belfast City

Thu 8/13

9:35 am-11:23 pm

2 stops19h 48m

$939

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 10/16

6:51 pm-6:10 pm

2 stops17h 19m

Belfast City

Tue 10/20

1:45 pm-7:30 pm

1 stop11h 45m

$967

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 8/4

9:35 pm-5:35 pm

1 stop14h 00m

Belfast City

Thu 8/13

9:35 am-10:25 pm

2 stops18h 50m

$968

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 10/16

9:35 pm-6:10 pm

1 stop14h 35m

Belfast City

Tue 10/20

9:40 am-10:00 pm

2 stops18h 20m

$970

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 10/16

4:32 pm-6:10 pm

2 stops19h 38m

Belfast City

Tue 10/20

9:40 am-11:25 pm

2 stops19h 45m

$971

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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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 and American Airlines are the most popular carriers 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

14h 00m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 14h 00m
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?

    The straight-line distance from Lambert-St Louis to Belfast is 3891.1 mi. Flights usually cover this in 14h 00m, 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