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Cheap flights from St. Louis to Belfast from $919

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 9/6. 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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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
1:01 pm - 10:30 am
STL
-
BHD
15h 29m
2 stops
American Airlines Logo
11:35 am - 11:33 pm
BHD
-
STL
17h 58m
2 stops
$919American Airlines
Sun, Sep 6 - Wed, Sep 16
British Airways Logo
7:23 am - 12:55 pm
STL
-
BHD
23h 32m
2 stops
British Airways Logo
10:05 am - 11:38 pm
BHD
-
STL
19h 33m
2 stops
$933British Airways
Mon, Sep 7 - Wed, Sep 16
Delta Logo
10:55 am - 4:55 pm
STL
-
BHD
24h 00m
2 stops
Delta Logo
5:30 pm - 11:01 pm
BHD
-
STL
35h 31m
2 stops
$939Delta
Tue, Sep 8 - Wed, Sep 16
British Airways Logo
7:23 am - 12:55 pm
STL
-
BHD
23h 32m
2 stops
British Airways Logo
11:35 am - 7:30 pm
BHD
-
STL
13h 55m
1 stop
$955British Airways
Mon, Sep 7 - Wed, Sep 16
British Airways Logo
1:37 pm - 10:30 am
STL
-
BHD
14h 53m
2 stops
British Airways Logo
9:40 am - 11:38 pm
BHD
-
STL
19h 58m
2 stops
$963British Airways
Sun, Sep 6 - Tue, Sep 15
KLM Logo
1:30 pm - 9:20 am
STL
-
BHD
13h 50m
2 stops
KLM Logo
9:50 am - 11:37 pm
BHD
-
STL
19h 47m
2 stops
$969KLM
Sun, Sep 6 - Thu, Sep 17
British Airways Logo
9:35 pm - 8:45 am
STL
-
BHD
29h 10m
1 stop
British Airways Logo
11:35 am - 7:30 pm
BHD
-
STL
13h 55m
1 stop
$977British Airways
Wed, Sep 9 - Wed, Sep 16
Delta Logo
3:42 pm - 4:55 pm
STL
-
BHD
19h 13m
2 stops
Delta Logo
9:45 am - 4:55 pm
BHD
-
STL
37h 10m
2 stops
$996Delta
Tue, Sep 8 - Sun, Sep 13
Multiple Airlines Logo
5:45 pm - 4:55 pm
STL
-
BHD
17h 10m
2 stops
Multiple Airlines Logo
5:30 pm - 3:57 pm
BHD
-
STL
28h 27m
2 stops
$1,019Multiple Airlines
Sat, Sep 5 - Wed, Sep 16
Multiple Airlines Logo
7:05 am - 9:30 pm
STL
-
BFS
32h 25m
2 stops
Multiple Airlines Logo
8:20 am - 7:26 pm
BFS
-
STL
17h 06m
2 stops
$1,484Multiple Airlines
Thu, May 14 - Thu, May 21

American Airlines flights from St. Louis to Belfast

Our best American Airlines deals on St. Louis to Belfast flight tickets
American Airlines
Sep 6
STL1:01 pmLambert-St Louis
15h 29m
2 stops
BHD10:30 amBelfast City
Sep 16
BHD11:35 amBelfast City
17h 58m
2 stops
STL11:33 pmLambert-St Louis
$919
American Airlines
Jul 12
STL7:55 pmLambert-St Louis
16h 50m
2 stops
BHD6:45 pmBelfast City
Jul 26
BHD11:00 amBelfast City
18h 56m
2 stops
STL11:56 pmLambert-St Louis
$1,203

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Sep 7
STL7:23 amLambert-St Louis
23h 32m
2 stops
BHD12:55 pmBelfast City
Sep 16
BHD10:05 amBelfast City
19h 33m
2 stops
STL11:38 pmLambert-St Louis
$933
British Airways
Sep 7
STL7:23 amLambert-St Louis
23h 32m
2 stops
BHD12:55 pmBelfast City
Sep 16
BHD11:35 amBelfast City
13h 55m
1 stop
STL7:30 pmLambert-St Louis
$955
British Airways
Sep 6
STL1:37 pmLambert-St Louis
14h 53m
2 stops
BHD10:30 amBelfast City
Sep 15
BHD9:40 amBelfast City
19h 58m
2 stops
STL11:38 pmLambert-St Louis
$963

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 1, 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
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 9/6

1:01 pm-10:30 am

2 stops15h 29m

Belfast City

Wed 9/16

11:35 am-11:33 pm

2 stops17h 58m

$919

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 9/7

7:23 am-12:55 pm

2 stops23h 32m

Belfast City

Wed 9/16

10:05 am-11:38 pm

2 stops19h 33m

$933

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 9/8

10:55 am-4:55 pm

2 stops24h 00m

Belfast City

Wed 9/16

5:30 pm-11:01 pm

2 stops35h 31m

$939

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 9/7

7:23 am-12:55 pm

2 stops23h 32m

Belfast City

Wed 9/16

11:35 am-7:30 pm

1 stop13h 55m

$955

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 9/6

1:37 pm-10:30 am

2 stops14h 53m

Belfast City

Tue 9/15

9:40 am-11:38 pm

2 stops19h 58m

$963

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 9/6

1:30 pm-9:20 am

2 stops13h 50m

Belfast City

Thu 9/17

9:50 am-11:37 pm

2 stops19h 47m

$969

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 9/9

9:35 pm-8:45 am

1 stop29h 10m

Belfast City

Wed 9/16

11:35 am-7:30 pm

1 stop13h 55m

$977

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 9/8

3:42 pm-4:55 pm

2 stops19h 13m

Belfast City

Sun 9/13

9:45 am-4:55 pm

2 stops37h 10m

$996

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sat 9/5

5:45 pm-4:55 pm

2 stops17h 10m

Belfast City

Wed 9/16

5:30 pm-3:57 pm

2 stops28h 27m

$1,019

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Thu 5/14

7:05 am-9:30 pm

2 stops32h 25m

Belfast Intl

Thu 5/21

8:20 am-7:26 pm

2 stops17h 06m

$1,484

Flights are sorted by cheapest round-trip 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 25m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 14h 25m
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 25m, 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.

Frequently asked questions about flying from St. Louis to Belfast

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

    Price Alerts will notify you by email when the price for flights to Belfast from St. Louis decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

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

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

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