Cheap flights from St. Louis to Belfast from £571

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Belfast departing on 25/10. 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
0 bags
Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise 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.

Find the cheapest flights from St. Louis to Belfast

Cheap return flights

British Airways Logo
17:09 - 11:20STL-BHD
36h 11m2 stops
British Airways Logo
09:15 - 21:55BHD-STL
41h 40m2 stops
£571British Airways
Find Deal
Sat, 25 Oct - Sat, 1 Nov
British Airways Logo
10:23 - 12:10STL-BHD
19h 47m2 stops
British Airways Logo
06:35 - 18:11BHD-STL
16h 36m2 stops
£604British Airways
Find Deal
Sat, 25 Oct - Sat, 1 Nov
 Logo
09:15 - 11:20STL-BFS
20h 05m3 stops
 Logo
08:40 - 13:32BFS-STL
34h 52m3 stops
Mon, 11 Aug - Thu, 14 Aug
 Logo
09:15 - 11:20STL-BFS
20h 05m3 stops
 Logo
22:45 - 15:21BFS-STL
22h 36m2 stops
Mon, 11 Aug - Thu, 14 Aug
 Logo
09:15 - 11:20STL-BFS
20h 05m2 stops
 Logo
22:45 - 15:21BFS-STL
22h 36m2 stops
£1,035
Find Deal
Mon, 11 Aug - Thu, 14 Aug
 Logo
16:00 - 14:10STL-BFS
16h 10m3 stops
 Logo
17:25 - 19:45BFS-STL
32h 20m3 stops
£1,127
Find Deal
Tue, 12 Aug - Fri, 15 Aug

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets
British Airways
25 Oct
STL17:09Lambert-St Louis
36h 11m
2 stops
BHD11:20Belfast City
1 Nov
BHD09:15Belfast City
41h 40m
2 stops
STL21:55Lambert-St Louis
British Airways
25 Oct
STL10:23Lambert-St Louis
19h 47m
2 stops
BHD12:10Belfast City
1 Nov
BHD06:35Belfast City
16h 36m
2 stops
STL18:11Lambert-St Louis

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 1 August 2025.
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

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sat 25/10

17:09-11:20

2 stops36h 11m

Belfast City

Sat 1/11

09:15-21:55

2 stops41h 40m

£571

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sat 25/10

10:23-12:10

2 stops19h 47m

Belfast City

Sat 1/11

06:35-18:11

2 stops16h 36m

£604

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 11/8

09:15-11:20

3 stops20h 05m

Belfast Intl

Thu 14/8

08:40-13:32

3 stops34h 52m

£969

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 11/8

09:15-11:20

3 stops20h 05m

Belfast Intl

Thu 14/8

22:45-15:21

2 stops22h 36m

£983

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 11/8

09:15-11:20

2 stops20h 05m

Belfast Intl

Thu 14/8

22:45-15:21

2 stops22h 36m

£1,035

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Tue 12/8

16:00-14:10

3 stops16h 10m

Belfast Intl

Fri 15/8

17:25-19:45

3 stops32h 20m

£1,127

Flights are sorted by cheapest return 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

Best price found

£571

Fastest flight time

16h 10m

Direct flights

None

Airports in Belfast

2 airports
The best flight deal from St. Louis to Belfast found on momondo in the last 72 hours is £571
The fastest flight from St. Louis to Belfast takes 16h 10m
There are no direct flights from St. Louis to Belfast. Popular non-direct routes for this connection are Lambert-St Louis Airport - Belfast City Airport and Lambert-St Louis Airport - Belfast Intl Airport.
There are 2 airports near Belfast: Belfast Intl (BFS), Belfast City (BHD)

  • How far is Lambert-St Louis to Belfast by plane?

    Belfast is 3891.1 mi away from Lambert-St Louis. By plane, this route typically takes 16h 10m.

  • 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?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for 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?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Belfast. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from St. Louis to Belfast with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.


Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Belfast?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Belfast. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Belfast with flexible booking policies on momondo?

Flights from St. Louis to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Belfast?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Belfast.

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, organise and travel with friends or family. Trips is free – and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Wed 6/8
Wed 13/8

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