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Cheap flights from St. Louis to Belfast from $1,137

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 7/7. 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.
Multiple Airlines Logo
5:42 pm - 4:55 pm
STL
-
BHD
17h 13m
2 stops
Multiple Airlines Logo
9:50 am - 9:56 pm
BHD
-
STL
18h 06m
2 stops
$1,137Multiple Airlines
Tue, Jul 7 - Sat, Jul 18
Multiple Airlines Logo
3:30 pm - 9:15 pm
STL
-
BFS
23h 45m
2 stops
Multiple Airlines Logo
9:05 pm - 8:25 pm
BFS
-
STL
29h 20m
3 stops
$1,432Multiple Airlines
Fri, May 8 - Fri, May 15
Multiple Airlines Logo
7:05 am - 3:00 pm
STL
-
BFS
25h 55m
3 stops
Multiple Airlines Logo
10:00 pm - 5:05 pm
BFS
-
STL
25h 05m
3 stops
$1,455Multiple Airlines
Sun, May 10 - Sun, May 17
Multiple Airlines Logo
3:30 pm - 11:10 pm
STL
-
BFS
25h 40m
2 stops
Multiple Airlines Logo
10:00 pm - 5:05 pm
BFS
-
STL
25h 05m
3 stops
$1,493Multiple Airlines
Sun, May 10 - Sun, May 17
Multiple Airlines Logo
3:30 pm - 9:15 pm
STL
-
BFS
23h 45m
2 stops
Multiple Airlines Logo
9:05 pm - 8:09 pm
BFS
-
STL
29h 04m
2 stops
$1,626Multiple Airlines
Fri, May 8 - Fri, May 15
Multiple Airlines Logo
7:05 am - 11:05 pm
STL
-
BFS
34h 00m
3 stops
Multiple Airlines Logo
8:20 am - 1:25 pm
BFS
-
STL
35h 05m
2 stops
$1,649Multiple Airlines
Sat, May 9 - Sat, May 16
British Airways Logo
9:35 pm - 8:50 am
STL
-
BHD
29h 15m
1 stop
British Airways Logo
12:40 pm - 11:32 pm
BHD
-
STL
40h 52m
2 stops
$1,740British Airways
Tue, Jul 7 - Sat, Jul 18
Multiple Airlines Logo
9:35 pm - 8:50 am
STL
-
BHD
29h 15m
1 stop
Multiple Airlines Logo
7:05 pm - 7:30 pm
BHD
-
STL
30h 25m
1 stop
$1,859Multiple Airlines
Tue, Jul 7 - Sat, Jul 18
Multiple Airlines Logo
9:35 pm - 8:35 pm
STL
-
BFS
17h 00m
2 stops
Multiple Airlines Logo
8:20 am - 7:30 pm
BFS
-
STL
41h 10m
2 stops
$1,989Multiple Airlines
Tue, Jul 7 - Sat, Jul 18
British Airways Logo
8:06 pm - 10:30 am
STL
-
BHD
32h 24m
2 stops
British Airways Logo
6:30 am - 7:20 pm
BHD
-
STL
18h 50m
2 stops
$2,242British Airways
Sat, Jul 18 - Wed, Jul 22

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
Jul 7
STL9:35 pmLambert-St Louis
29h 15m
1 stop
BHD8:50 amBelfast City
Jul 18
BHD12:40 pmBelfast City
40h 52m
2 stops
STL11:32 pmLambert-St Louis
$1,740
British Airways
Jul 18
STL8:06 pmLambert-St Louis
32h 24m
2 stops
BHD10:30 amBelfast City
Jul 22
BHD6:30 amBelfast City
18h 50m
2 stops
STL7:20 pmLambert-St Louis
$2,242
British Airways
Jul 18
STL6:12 pmLambert-St Louis
34h 18m
2 stops
BHD10:30 amBelfast City
Jul 22
BHD6:30 amBelfast City
19h 00m
1 stop
STL7:30 pmLambert-St Louis
$2,551

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 March 27, 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

Tue 7/7

5:42 pm-4:55 pm

2 stops17h 13m

Belfast City

Sat 7/18

9:50 am-9:56 pm

2 stops18h 06m

$1,137

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 5/8

3:30 pm-9:15 pm

2 stops23h 45m

Belfast Intl

Fri 5/15

9:05 pm-8:25 pm

3 stops29h 20m

$1,432

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 5/10

7:05 am-3:00 pm

3 stops25h 55m

Belfast Intl

Sun 5/17

10:00 pm-5:05 pm

3 stops25h 05m

$1,455

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 5/10

3:30 pm-11:10 pm

2 stops25h 40m

Belfast Intl

Sun 5/17

10:00 pm-5:05 pm

3 stops25h 05m

$1,493

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 5/8

3:30 pm-9:15 pm

2 stops23h 45m

Belfast Intl

Fri 5/15

9:05 pm-8:09 pm

2 stops29h 04m

$1,626

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sat 5/9

7:05 am-11:05 pm

3 stops34h 00m

Belfast Intl

Sat 5/16

8:20 am-1:25 pm

2 stops35h 05m

$1,649

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 7/7

9:35 pm-8:50 am

1 stop29h 15m

Belfast City

Sat 7/18

12:40 pm-11:32 pm

2 stops40h 52m

$1,740

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 7/7

9:35 pm-8:50 am

1 stop29h 15m

Belfast City

Sat 7/18

7:05 pm-7:30 pm

1 stop30h 25m

$1,859

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 7/7

9:35 pm-8:35 pm

2 stops17h 00m

Belfast Intl

Sat 7/18

8:20 am-7:30 pm

2 stops41h 10m

$1,989

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sat 7/18

8:06 pm-10:30 am

2 stops32h 24m

Belfast City

Wed 7/22

6:30 am-7:20 pm

2 stops18h 50m

$2,242

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

13h 36m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 13h 36m
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 13h 36m, 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.

  • 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