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Cheap flights from St. Louis to Belfast from $1,060

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 8/11. 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.
British Airways Logo
9:35 pm - 5:35 pm
STL
-
BHD
14h 00m
1 stop
British Airways Logo
8:25 pm - 12:14 am
BHD
-
STL
33h 49m
2 stops
$1,060British Airways
Tue, Aug 11 - Tue, Aug 18
British Airways Logo
9:32 am - 10:45 am
STL
-
BHD
19h 13m
2 stops
British Airways Logo
8:25 pm - 12:14 am
BHD
-
STL
33h 49m
2 stops
$1,062British Airways
Tue, Aug 11 - Tue, Aug 18
Delta Logo
3:39 pm - 4:55 pm
STL
-
BHD
19h 16m
2 stops
Delta Logo
5:30 pm - 3:10 pm
BHD
-
STL
27h 40m
2 stops
$1,090Delta
Mon, Aug 10 - Tue, Aug 18
Delta Logo
11:13 am - 9:20 am
STL
-
BHD
16h 07m
2 stops
Delta Logo
5:30 pm - 2:33 pm
BHD
-
STL
27h 03m
2 stops
$1,110Delta
Wed, Aug 12 - Mon, Aug 17
British Airways Logo
9:35 pm - 5:35 pm
STL
-
BHD
14h 00m
1 stop
British Airways Logo
6:30 am - 7:30 pm
BHD
-
STL
19h 00m
1 stop
$1,129British Airways
Tue, Aug 11 - Tue, Aug 18
KLM Logo
11:00 am - 9:20 am
STL
-
BHD
16h 20m
2 stops
KLM Logo
5:30 pm - 2:33 pm
BHD
-
STL
27h 03m
2 stops
$1,140KLM
Thu, Aug 13 - Tue, Aug 18
British Airways Logo
11:32 am - 4:45 pm
STL
-
BHD
23h 13m
2 stops
British Airways Logo
6:45 am - 4:43 pm
BHD
-
STL
15h 58m
2 stops
$1,141British Airways
Tue, Dec 1 - Fri, Dec 4
British Airways Logo
5:31 pm - 6:40 pm
STL
-
BHD
19h 09m
2 stops
British Airways Logo
6:45 am - 11:58 pm
BHD
-
STL
23h 13m
2 stops
$1,142British Airways
Tue, Dec 1 - Fri, Dec 4
Multiple Airlines Logo
8:55 am - 11:15 am
STL
-
BFS
20h 20m
2 stops
Multiple Airlines Logo
9:55 pm - 1:25 pm
BFS
-
STL
21h 30m
2 stops
$1,209Multiple Airlines
Mon, Sep 7 - Mon, Sep 14
Multiple Airlines Logo
12:10 pm - 8:25 pm
STL
-
BFS
26h 15m
3 stops
Multiple Airlines Logo
9:50 pm - 8:24 pm
BFS
-
STL
28h 34m
2 stops
$1,237Multiple Airlines
Wed, Aug 12 - Mon, Aug 17

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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
Aug 11
STL9:35 pmLambert-St Louis
14h 00m
1 stop
BHD5:35 pmBelfast City
Aug 18
BHD8:25 pmBelfast City
33h 49m
2 stops
STL12:14 amLambert-St Louis
$1,060
British Airways
Aug 11
STL9:32 amLambert-St Louis
19h 13m
2 stops
BHD10:45 amBelfast City
Aug 18
BHD8:25 pmBelfast City
33h 49m
2 stops
STL12:14 amLambert-St Louis
$1,062
British Airways
Aug 11
STL9:35 pmLambert-St Louis
14h 00m
1 stop
BHD5:35 pmBelfast City
Aug 18
BHD6:30 amBelfast City
19h 00m
1 stop
STL7:30 pmLambert-St Louis
$1,129

Delta flights from St. Louis to Belfast

Our best Delta deals on St. Louis to Belfast flight tickets
Delta
Aug 10
STL3:39 pmLambert-St Louis
19h 16m
2 stops
BHD4:55 pmBelfast City
Aug 18
BHD5:30 pmBelfast City
27h 40m
2 stops
STL3:10 pmLambert-St Louis
$1,090
Delta
Aug 12
STL11:13 amLambert-St Louis
16h 07m
2 stops
BHD9:20 amBelfast City
Aug 17
BHD5:30 pmBelfast City
27h 03m
2 stops
STL2:33 pmLambert-St Louis
$1,110
Delta
Aug 10
STL12:52 pmLambert-St Louis
14h 28m
2 stops
BHD9:20 amBelfast City
Aug 16
BHD5:30 pmBelfast City
30h 08m
2 stops
STL5:38 pmLambert-St Louis
$1,170

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 25, 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

Tue 8/11

9:35 pm-5:35 pm

1 stop14h 00m

Belfast City

Tue 8/18

8:25 pm-12:14 am

2 stops33h 49m

$1,060

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 8/11

9:32 am-10:45 am

2 stops19h 13m

Belfast City

Tue 8/18

8:25 pm-12:14 am

2 stops33h 49m

$1,062

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 8/10

3:39 pm-4:55 pm

2 stops19h 16m

Belfast City

Tue 8/18

5:30 pm-3:10 pm

2 stops27h 40m

$1,090

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 8/12

11:13 am-9:20 am

2 stops16h 07m

Belfast City

Mon 8/17

5:30 pm-2:33 pm

2 stops27h 03m

$1,110
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 8/11

9:35 pm-5:35 pm

1 stop14h 00m

Belfast City

Tue 8/18

6:30 am-7:30 pm

1 stop19h 00m

$1,129

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Thu 8/13

11:00 am-9:20 am

2 stops16h 20m

Belfast City

Tue 8/18

5:30 pm-2:33 pm

2 stops27h 03m

$1,140

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 12/1

11:32 am-4:45 pm

2 stops23h 13m

Belfast City

Fri 12/4

6:45 am-4:43 pm

2 stops15h 58m

$1,141

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 12/1

5:31 pm-6:40 pm

2 stops19h 09m

Belfast City

Fri 12/4

6:45 am-11:58 pm

2 stops23h 13m

$1,142

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 9/7

8:55 am-11:15 am

2 stops20h 20m

Belfast Intl

Mon 9/14

9:55 pm-1:25 pm

2 stops21h 30m

$1,209

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Wed 8/12

12:10 pm-8:25 pm

3 stops26h 15m

Belfast Intl

Mon 8/17

9:50 pm-8:24 pm

2 stops28h 34m

$1,237

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

15h 05m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 15h 05m
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 15h 05m, 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