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Cheap flights from St. Louis to Belfast from $282

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 7/21. 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.
British Airways Logo
9:35 pm - 3:40 pm
STL
-
BHD
12h 05m
1 stop
British Airways Logo
7:35 pm - 7:17 pm
BHD
-
STL
29h 42m
2 stops
$1,217British Airways
Wed, Jul 1 - Mon, Jul 6
British Airways Logo
5:00 pm - 1:35 pm
STL
-
BHD
14h 35m
2 stops
British Airways Logo
7:35 pm - 7:17 pm
BHD
-
STL
29h 42m
2 stops
$1,221British Airways
Wed, Jul 1 - Mon, Jul 6
Multiple Airlines Logo
9:35 pm - 10:10 am
STL
-
BHD
30h 35m
1 stop
Multiple Airlines Logo
7:35 pm - 7:30 pm
BHD
-
STL
29h 55m
1 stop
$1,274Multiple Airlines
Wed, Jul 1 - Mon, Jul 6
Multiple Airlines Logo
6:30 am - 2:25 pm
STL
-
BFS
25h 55m
3 stops
Multiple Airlines Logo
10:00 pm - 8:04 pm
BFS
-
STL
28h 04m
2 stops
$1,699Multiple Airlines
Fri, May 1 - Fri, May 8
Multiple Airlines Logo
6:30 am - 2:25 pm
STL
-
BFS
25h 55m
3 stops
Multiple Airlines Logo
3:15 pm - 8:04 pm
BFS
-
STL
34h 49m
3 stops
$1,801Multiple Airlines
Fri, May 1 - Fri, May 8
British Airways Logo
7:54 pm - 3:30 pm
STL
-
BHD
13h 36m
2 stops
British Airways Logo
11:35 am - 8:29 pm
BHD
-
STL
14h 54m
2 stops
$2,318British Airways
Thu, Jul 2 - Wed, Jul 15

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 17, 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

Wed 7/1

9:35 pm-3:40 pm

1 stop12h 05m

Belfast City

Mon 7/6

7:35 pm-7:17 pm

2 stops29h 42m

$1,217

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 7/1

5:00 pm-1:35 pm

2 stops14h 35m

Belfast City

Mon 7/6

7:35 pm-7:17 pm

2 stops29h 42m

$1,221

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 7/1

9:35 pm-10:10 am

1 stop30h 35m

Belfast City

Mon 7/6

7:35 pm-7:30 pm

1 stop29h 55m

$1,274

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 5/1

6:30 am-2:25 pm

3 stops25h 55m

Belfast Intl

Fri 5/8

10:00 pm-8:04 pm

2 stops28h 04m

$1,699

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 5/1

6:30 am-2:25 pm

3 stops25h 55m

Belfast Intl

Fri 5/8

3:15 pm-8:04 pm

3 stops34h 49m

$1,801
Quickest round-trip

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Thu 7/2

7:54 pm-3:30 pm

2 stops13h 36m

Belfast City

Wed 7/15

11:35 am-8:29 pm

2 stops14h 54m

$2,318
Cheapest one-way

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 7/21

5:11 pm-3:20 pm

2 stops16h 09m

$282

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 7/21

3:30 pm-10:20 pm

3 stops48h 50m

$415

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 7/21

3:30 pm-3:30 pm

3 stops42h 00m

$448

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 7/21

4:44 pm-9:00 pm

2 stops46h 16m

$467

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

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 is the most popular carrier 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

15h 10m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 15h 10m
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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  • 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 10m, 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