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.

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.

$641 Cheap Flights from St. Louis to Belfast in 2026

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Find the cheapest flights from St. Louis to Belfast

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:59 am - 9:10 am

STL

BHD

15h 11m

2 stops

8:25 pm - 11:04 pm

BHD

STL

32h 39m

2 stops

$641British Airways

Wed, Feb 25 - Sun, Mar 1

1:34 pm - 2:15 pm

STL

BHD

19h 41m

2 stops

8:25 pm - 11:48 pm

BHD

STL

32h 23m

2 stops

$1,368British Airways

Fri, Mar 13 - Sun, Mar 22

11:46 am - 2:15 pm

STL

BHD

21h 29m

2 stops

11:05 am - 11:29 am

BHD

STL

29h 24m

3 stops

$1,588Multiple Airlines

Fri, Mar 13 - Sun, Mar 22

British Airways flights from St. Louis to Belfast

Our best British Airways deals on St. Louis to Belfast flight tickets

British Airways

Feb 25

STL11:59 amLambert-St Louis

15h 11m

2 stops

BHD9:10 amBelfast City

Mar 1

BHD8:25 pmBelfast City

32h 39m

2 stops

STL11:04 pmLambert-St Louis

$641

British Airways

Jan 24

STL3:54 pmLambert-St Louis

18h 51m

2 stops

BHD4:45 pmBelfast City

Jan 26

BHD5:45 pmBelfast City

33h 30m

2 stops

STL9:15 pmLambert-St Louis

$1,200

British Airways

Mar 13

STL1:34 pmLambert-St Louis

19h 41m

2 stops

BHD2:15 pmBelfast City

Mar 22

BHD8:25 pmBelfast City

32h 23m

2 stops

STL11:48 pmLambert-St Louis

$1,368

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 2/25

11:59 am-9:10 am

2 stops15h 11m

Belfast City

Sun 3/1

8:25 pm-11:04 pm

2 stops32h 39m

$641

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 3/13

1:34 pm-2:15 pm

2 stops19h 41m

Belfast City

Sun 3/22

8:25 pm-11:48 pm

2 stops32h 23m

$1,368

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 3/13

11:46 am-2:15 pm

2 stops21h 29m

Belfast City

Sun 3/22

11:05 am-11:29 am

3 stops29h 24m

$1,588

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	15h 11m
Direct flights	None

The fastest flight from St. Louis to Belfast takes 15h 11m

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 15h 11m, 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.