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Cheap flights from St. Louis to Belfast from £845

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 15/11. 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 return flights

Enter your travel dates to find the best prices.
British Airways Logo
09:50 - 10:20STL  Lambert-St Louis-BHD Belfast City
18h 30m2 stops Boston Logan Intl London Heathrow
British Airways Logo
11:25 - 23:59BHD  Belfast City-STL Lambert-St Louis
18h 34m2 stops London Heathrow Chicago O'Hare Intl
£845British Airways
Sun, 15 Nov - Tue, 17 Nov
British Airways Logo
07:29 - 10:50STL  Lambert-St Louis-BHD Belfast City
21h 21m2 stops Chicago O'Hare Intl London Heathrow
British Airways Logo
06:45 - 16:43BHD  Belfast City-STL Lambert-St Louis
15h 58m2 stops London Heathrow Chicago O'Hare Intl
£852British Airways
Mon, 18 Jan - Fri, 22 Jan
Multiple Airlines Logo
08:55 - 23:05STL  Lambert-St Louis-BFS Belfast Intl
32h 10m3 stops Toronto Pearson Intl Frankfurt am Main Birmingham
Multiple Airlines Logo
15:20 - 13:25BFS  Belfast Intl-STL Lambert-St Louis
28h 05m2 stops Birmingham Frankfurt am Main
£1,601Multiple Airlines
Sat, 26 Sep - Sat, 3 Oct
Multiple Airlines Logo
12:10 - 12:25STL  Lambert-St Louis-BFS Belfast Intl
18h 15m2 stops Montreal Pierre Elliott Trudeau Intl Barcelona-El Prat
Multiple Airlines Logo
15:20 - 13:25BFS  Belfast Intl-STL Lambert-St Louis
28h 05m2 stops Birmingham Frankfurt am Main
£1,729Multiple Airlines
Sat, 26 Sep - Sat, 3 Oct

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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
15 Nov
STL09:50Lambert-St Louis
18h 30m
2 stops
BHD10:20Belfast City
17 Nov
BHD11:25Belfast City
18h 34m
2 stops
STL23:59Lambert-St Louis
£845
British Airways
18 Jan
STL07:29Lambert-St Louis
21h 21m
2 stops
BHD10:50Belfast City
22 Jan
BHD06:45Belfast City
15h 58m
2 stops
STL16:43Lambert-St Louis
£852

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 15 August 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 return flight
Fastest return journey

St. LouisBelfast

STL Lambert-St Louis - BHD Belfast City

STLBHD

Lambert-St Louis

Sun 15/11

09:50-10:20

2 stops18h 30m

Belfast City

Tue 17/11

11:25-23:59

2 stops18h 34m

£845

St. LouisBelfast

STL Lambert-St Louis - BHD Belfast City

STLBHD

Lambert-St Louis

Mon 18/1

07:29-10:50

2 stops21h 21m

Belfast City

Fri 22/1

06:45-16:43

2 stops15h 58m

£852

St. LouisBelfast

STL Lambert-St Louis - BFS Belfast Intl

STLBFS

Lambert-St Louis

Sat 26/9

08:55-23:05

3 stops32h 10m

Belfast Intl

Sat 3/10

15:20-13:25

2 stops28h 05m

£1,601

St. LouisBelfast

STL Lambert-St Louis - BFS Belfast Intl

STLBFS

Lambert-St Louis

Sat 26/9

12:10-12:25

2 stops18h 15m

Belfast Intl

Sat 3/10

15:20-13:25

2 stops28h 05m

£1,729

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

Fastest flight time

18h 44m

Direct flights

None
The fastest flight from St. Louis to Belfast takes 18h 44m
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?

    Belfast is 3891.1 mi away from Lambert-St Louis. By plane, this route typically takes 18h 44m.

  • 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.

Frequently asked questions about flying from St. Louis to Belfast

  • 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.

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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