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Cheap flights from St. Louis to Belfast from $970

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 11/1. 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

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
2:08 pm - 1:55 pm
STL
-
BHD
17h 47m
2 stops
American Airlines Logo
12:10 pm - 11:58 pm
BHD
-
STL
17h 48m
2 stops
$970American Airlines
Sun, Nov 1 - Sun, Nov 8
KLM Logo
11:13 am - 9:20 am
STL
-
BHD
16h 07m
2 stops
KLM Logo
5:30 pm - 4:17 pm
BHD
-
STL
28h 47m
2 stops
$1,219KLM
Fri, Aug 7 - Sun, Aug 16
Multiple Airlines Logo
12:10 pm - 7:15 pm
STL
-
BFS
25h 05m
2 stops
Multiple Airlines Logo
3:40 pm - 6:41 pm
BFS
-
STL
33h 01m
3 stops
$1,267Multiple Airlines
Wed, Sep 2 - Wed, Sep 9
British Airways Logo
12:45 pm - 10:05 am
STL
-
BHD
39h 20m
2 stops
British Airways Logo
7:10 pm - 11:34 pm
BHD
-
STL
34h 24m
2 stops
$1,270British Airways
Fri, Aug 7 - Sun, Aug 16
Multiple Airlines Logo
12:10 pm - 10:20 pm
STL
-
BFS
28h 10m
3 stops
Multiple Airlines Logo
3:40 pm - 6:41 pm
BFS
-
STL
33h 01m
3 stops
$1,419Multiple Airlines
Wed, Sep 2 - Wed, Sep 9
British Airways Logo
9:35 pm - 6:10 pm
STL
-
BHD
14h 35m
1 stop
British Airways Logo
7:10 pm - 4:24 pm
BHD
-
STL
27h 14m
2 stops
$1,421British Airways
Fri, Aug 7 - Sun, Aug 16
Multiple Airlines Logo
9:35 pm - 10:05 am
STL
-
BHD
30h 30m
1 stop
Multiple Airlines Logo
6:30 am - 6:05 pm
BHD
-
STL
17h 35m
2 stops
$1,428Multiple Airlines
Fri, Aug 7 - Sun, Aug 16
Multiple Airlines Logo
8:55 am - 2:15 pm
STL
-
BFS
23h 20m
3 stops
Multiple Airlines Logo
6:45 am - 8:24 pm
BFS
-
STL
43h 39m
3 stops
$1,647Multiple Airlines
Fri, Aug 7 - Sun, Aug 16
Multiple Airlines Logo
8:55 am - 2:15 pm
STL
-
BFS
23h 20m
3 stops
Multiple Airlines Logo
9:25 pm - 8:24 pm
BFS
-
STL
28h 59m
2 stops
$1,745Multiple Airlines
Fri, Aug 7 - Sun, Aug 16
British Airways Logo
9:35 pm - 3:30 pm
STL
-
BHD
11h 55m
1 stop
British Airways Logo
11:00 am - 7:30 pm
BHD
-
STL
14h 30m
1 stop
$1,917British Airways
Fri, Aug 7 - Sun, Aug 16

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British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Dec 1
STL5:27 pmLambert-St Louis
19h 13m
2 stops
BHD6:40 pmBelfast City
Dec 4
BHD6:45 amBelfast City
23h 13m
2 stops
STL11:58 pmLambert-St Louis
$1,143
British Airways
Nov 29
STL10:45 amLambert-St Louis
22h 15m
2 stops
BHD3:00 pmBelfast City
Dec 2
BHD3:40 pmBelfast City
33h 50m
2 stops
STL7:30 pmLambert-St Louis
$1,186
British Airways
Aug 7
STL12:45 pmLambert-St Louis
39h 20m
2 stops
BHD10:05 amBelfast City
Aug 16
BHD7:10 pmBelfast City
34h 24m
2 stops
STL11:34 pmLambert-St Louis
$1,270

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 July 19, 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 11/1

2:08 pm-1:55 pm

2 stops17h 47m

Belfast City

Sun 11/8

12:10 pm-11:58 pm

2 stops17h 48m

$970

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/7

11:13 am-9:20 am

2 stops16h 07m

Belfast City

Sun 8/16

5:30 pm-4:17 pm

2 stops28h 47m

$1,219

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 9/2

12:10 pm-7:15 pm

2 stops25h 05m

Belfast Intl

Wed 9/9

3:40 pm-6:41 pm

3 stops33h 01m

$1,267

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/7

12:45 pm-10:05 am

2 stops39h 20m

Belfast City

Sun 8/16

7:10 pm-11:34 pm

2 stops34h 24m

$1,270

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 9/2

12:10 pm-10:20 pm

3 stops28h 10m

Belfast Intl

Wed 9/9

3:40 pm-6:41 pm

3 stops33h 01m

$1,419

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/7

9:35 pm-6:10 pm

1 stop14h 35m

Belfast City

Sun 8/16

7:10 pm-4:24 pm

2 stops27h 14m

$1,421

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/7

9:35 pm-10:05 am

1 stop30h 30m

Belfast City

Sun 8/16

6:30 am-6:05 pm

2 stops17h 35m

$1,428

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 8/7

8:55 am-2:15 pm

3 stops23h 20m

Belfast Intl

Sun 8/16

6:45 am-8:24 pm

3 stops43h 39m

$1,647

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 8/7

8:55 am-2:15 pm

3 stops23h 20m

Belfast Intl

Sun 8/16

9:25 pm-8:24 pm

2 stops28h 59m

$1,745
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/7

9:35 pm-3:30 pm

1 stop11h 55m

Belfast City

Sun 8/16

11:00 am-7:30 pm

1 stop14h 30m

$1,917

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

18h 49m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 18h 49m
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 18h 49m, 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