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.

$625 Cheap Flights from St. Louis to Belfast in 2025/26

1 adult

0 bags

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Find the cheapest flights from St. Louis to Belfast

Round-trip

One-way

Cheap round-trip flights

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6:44 pm - 6:35 pm

STL

BHD

17h 51m2 stops

6:35 am - 6:16 pm

BHD

STL

17h 41m2 stops

$625British Airways

Mon, Jan 12 - Tue, Jan 20

5:04 pm - 4:05 pm

STL

BHD

17h 01m2 stops

6:35 am - 6:16 pm

BHD

STL

17h 41m2 stops

$716British Airways

Mon, Jan 12 - Tue, Jan 20

3:37 pm - 5:15 pm

STL

BHD

19h 38m2 stops

6:35 am - 10:44 pm

BHD

STL

22h 09m2 stops

$844British Airways

Fri, Feb 6 - Tue, Feb 10

2:06 pm - 2:15 pm

STL

BHD

18h 09m2 stops

6:35 am - 6:34 pm

BHD

STL

17h 59m2 stops

$1,094American Airlines

Wed, Dec 31 - Wed, Jan 7

British Airways flights from St. Louis to Belfast

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

British Airways

Jan 12

STL6:44 pmLambert-St Louis

17h 51m

2 stops

BHD6:35 pmBelfast City

Jan 20

BHD6:35 amBelfast City

17h 41m

2 stops

STL6:16 pmLambert-St Louis

$625

Find similar

British Airways

Jan 12

STL5:04 pmLambert-St Louis

17h 01m

2 stops

BHD4:05 pmBelfast City

Jan 20

BHD6:35 amBelfast City

17h 41m

2 stops

STL6:16 pmLambert-St Louis

$715

Find similar

British Airways

Jan 12

STL5:04 pmLambert-St Louis

17h 01m

2 stops

BHD4:05 pmBelfast City

Jan 20

BHD6:35 amBelfast City

17h 41m

2 stops

STL6:16 pmLambert-St Louis

$716

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 1/12

6:44 pm-6:35 pm

2 stops17h 51m

Belfast City

Tue 1/20

6:35 am-6:16 pm

2 stops17h 41m

$625

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 1/12

5:04 pm-4:05 pm

2 stops17h 01m

Belfast City

Tue 1/20

6:35 am-6:16 pm

2 stops17h 41m

$716

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 2/6

3:37 pm-5:15 pm

2 stops19h 38m

Belfast City

Tue 2/10

6:35 am-10:44 pm

2 stops22h 09m

$844

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Wed 12/31

2:06 pm-2:15 pm

2 stops18h 09m

Belfast City

Wed 1/7

6:35 am-6:34 pm

2 stops17h 59m

$1,094

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 day to depart on your flight to Belfast?

The cheapest day to depart from St. Louis to Belfast is on a Tuesday when prices can be found for as low as $674. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Belfast for around $870.

What is the cheapest time of day to depart on your flight to Belfast?

Our data shows that the cheapest St. Louis to Belfast flights are usually those with departure times in the afternoon. Our users have found flights to Belfast in the afternoon for as low as $785. Try not to purchase tickets at noon because they tend to be around $1,429. Of course, these prices can vary depending on the time of year and what airport you fly to.

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	16h 50m
Direct flights	None

The fastest flight from St. Louis to Belfast takes 16h 50m

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 16h 50m, 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.