Latest deals
Insights
FAQs
Price Alerts

Cheap flights from St. Louis to Belfast from $418

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 8/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
2:50 pm - 2:15 pm
STL
-
BHD
17h 25m
2 stops
British Airways Logo
6:35 am - 12:05 am
BHD
-
STL
23h 30m
2 stops
$1,141British Airways
Mon, Nov 16 - Thu, Nov 19
Multiple Airlines Logo
12:10 pm - 10:50 pm
STL
-
BFS
28h 40m
3 stops
Multiple Airlines Logo
6:45 am - 8:22 pm
BFS
-
STL
43h 37m
3 stops
$1,427Multiple Airlines
Sun, Jul 26 - Sun, Aug 2
Multiple Airlines Logo
2:40 pm - 10:50 pm
STL
-
BFS
26h 10m
2 stops
Multiple Airlines Logo
6:45 am - 8:22 pm
BFS
-
STL
43h 37m
3 stops
$1,433Multiple Airlines
Sun, Jul 26 - Sun, Aug 2
Multiple Airlines Logo
8:55 am - 10:50 pm
STL
-
BFS
31h 55m
2 stops
Multiple Airlines Logo
7:20 pm - 1:25 pm
BFS
-
STL
24h 05m
2 stops
$1,641Multiple Airlines
Sun, Jul 26 - Sun, Aug 2
Multiple Airlines Logo
2:40 pm - 9:35 pm
STL
-
BFS
24h 55m
2 stops
Multiple Airlines Logo
6:40 am - 11:29 pm
BFS
-
STL
22h 49m
3 stops
$1,661Multiple Airlines
Mon, Jul 27 - Mon, Aug 3
Multiple Airlines Logo
8:55 am - 9:35 pm
STL
-
BFS
30h 40m
2 stops
Multiple Airlines Logo
6:40 am - 8:22 pm
BFS
-
STL
19h 42m
2 stops
$1,707Multiple Airlines
Mon, Jul 27 - Mon, Aug 3
Multiple Airlines Logo
8:55 am - 11:15 am
STL
-
BFS
20h 20m
3 stops
Multiple Airlines Logo
6:40 am - 11:29 pm
BFS
-
STL
22h 49m
3 stops
$1,767Multiple Airlines
Mon, Jul 27 - Mon, Aug 3

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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 June 15, 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

Mon 11/16

2:50 pm-2:15 pm

2 stops17h 25m

Belfast City

Thu 11/19

6:35 am-12:05 am

2 stops23h 30m

$1,141

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 7/26

12:10 pm-10:50 pm

3 stops28h 40m

Belfast Intl

Sun 8/2

6:45 am-8:22 pm

3 stops43h 37m

$1,427

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 7/26

2:40 pm-10:50 pm

2 stops26h 10m

Belfast Intl

Sun 8/2

6:45 am-8:22 pm

3 stops43h 37m

$1,433

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Sun 7/26

8:55 am-10:50 pm

2 stops31h 55m

Belfast Intl

Sun 8/2

7:20 pm-1:25 pm

2 stops24h 05m

$1,641

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 7/27

2:40 pm-9:35 pm

2 stops24h 55m

Belfast Intl

Mon 8/3

6:40 am-11:29 pm

3 stops22h 49m

$1,661

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 7/27

8:55 am-9:35 pm

2 stops30h 40m

Belfast Intl

Mon 8/3

6:40 am-8:22 pm

2 stops19h 42m

$1,707

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 7/27

8:55 am-11:15 am

3 stops20h 20m

Belfast Intl

Mon 8/3

6:40 am-11:29 pm

3 stops22h 49m

$1,767
Cheapest one-way

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Fri 8/21

8:08 pm-8:15 am

3 stops54h 07m

$418

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/21

8:08 pm-9:05 pm

3 stops42h 57m

$476

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 8/21

11:13 am-9:20 am

2 stops16h 07m

$522

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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?

KLM and British Airways are the most popular carriers 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

22h 40m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 22h 40m
There are no direct flights from St. Louis to Belfast. There are no popular flight routes from St. Louis to Belfast.
Search flight deals

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 22h 40m, 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.

An easier way to manage your Belfast trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 7/15
Wed 7/22
By creating a price alert you accept our terms of use and privacy policy.

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