How long is the flight from St. Louis to Belfast?

Departing from St. Louis to Belfast will take you 15h 35m. The distance between St. Louis and Belfast is about 3893 mi.

In terms of precipitation, rainfall in Belfast ranges from 2.0 - 3.5 inches per month. October is typically the wettest month, when rainfall can reach 3.5 in. April is typically the driest time to visit Belfast when rainfall is around 2.0 in.

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).

What is the cheapest time of day to fly from STL to BFS?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Belfast as you normally would.

What airport do you fly from for flights from St. Louis to Belfast?

Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Belfast from St. Louis. Booking flights from Lambert-St Louis (STL) to Belfast should be relatively easy as there are 0 daily outbound flights to Belfast from 0 different airlines.

Can I find deals for flights from St. Louis to Belfast that include hotel bookings?

Yes. In addition to deals on St. Louis to Belfast flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Belfast?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Belfast.

Can I find deals for business class flights from St. Louis to Belfast?

Yes. Cheapflights offers flight deals from St. Louis to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$1,481+ Cheap Flights from St. Louis to Belfast

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Cheap flight deals from St. Louis to Belfast

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Cheapest flights from St. Louis to Belfast
Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2026.

Mon 11/161:15 pm -

2 stops15h 35m

Wed 11/185:35 pm -

2 stops32h 58m

Deal found 9/6

$1,481

Find flight deals from St. Louis to Belfast

Round-trip from	$1,481 (British Airways)

From Lambert-St Louis to Belfast

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Route

Depart

Return

Price

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Quickest round-trip

St. LouisBelfast

STL Lambert-St Louis - BHD Belfast City

STLBHD

Lambert-St Louis

Mon 11/16

1:15 pm-10:50 am

2 stops15h 35m

Belfast City

Wed 11/18

5:35 pm-8:33 pm

2 stops32h 58m

$1,481

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/6

Sorted by cheapest first

Best time to book a flight from St. Louis to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from St. Louis with our price prediction graph.

STL-BF1

STL-BHD

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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Everything you need to know about your flight from St. Louis to Belfast

STL-BF1

STL-BHD

No data available for this route at this time. Please check back soon.

Related info for your journey

What airport do you fly from for flights from St. Louis to Belfast?
Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Belfast from St. Louis. Booking flights from Lambert-St Louis (STL) to Belfast should be relatively easy as there are 0 daily outbound flights to Belfast from 0 different airlines.
How long is the flight from St. Louis to Belfast?
Departing from St. Louis to Belfast will take you 15h 35m. The distance between St. Louis and Belfast is about 3893 mi.
Can I find deals for flights from St. Louis to Belfast that include hotel bookings?
Yes. In addition to deals on St. Louis to Belfast flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Belfast?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Belfast.
Can I find deals for business class flights from St. Louis to Belfast?
Yes. Cheapflights offers flight deals from St. Louis to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Belfast with Cheapflights

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3. Compare prices and book

Cheap flight deals from St. Louis to Belfast

Cheapest flights from St. Louis to Belfast
Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2026.

Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2026.

Best flights from St. Louis to Belfast
Discover carefully curated flight deals from St. Louis to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.

Discover carefully curated flight deals from St. Louis to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.

Find flight deals from St. Louis to Belfast

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Best time to book a flight from St. Louis to Belfast

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Related info for your journey

What airport do you fly from for flights from St. Louis to Belfast?

How long is the flight from St. Louis to Belfast?

Can I find deals for flights from St. Louis to Belfast that include hotel bookings?

How can I find direct flights from St. Louis to Belfast?

Can I find deals for business class flights from St. Louis to Belfast?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Belfast by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from St. Louis to Belfast by cabin class

Find flights from St. Louis to Belfast, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Belfast flights

Browse other St. Louis and Belfast flight options. Last updated on September 11, 2026.

Other flights from St. Louis

Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.

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$1,481+ Cheap flights from St. Louis (STL) to Belfast

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Belfast with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Belfast

Cheapest flights from St. Louis to BelfastExplore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2026.

Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2026.

Best flights from St. Louis to BelfastDiscover carefully curated flight deals from St. Louis to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.

Discover carefully curated flight deals from St. Louis to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.

Find flight deals from St. Louis to Belfast

Round-trip from

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Belfast that are best for you.

Best time to book a flight from St. Louis to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from St. Louis with our price prediction graph.

Cheapflights Insights

Related info for your journey

What airport do you fly from for flights from St. Louis to Belfast?

How long is the flight from St. Louis to Belfast?

Can I find deals for flights from St. Louis to Belfast that include hotel bookings?

How can I find direct flights from St. Louis to Belfast?

Can I find deals for business class flights from St. Louis to Belfast?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Belfast by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from St. Louis to Belfast by cabin class

Find flights from St. Louis to Belfast, based on your preferred cabin class, be it economy, premium economy, business, or first class.

St. Louis and Belfast flights

Browse other St. Louis and Belfast flight options. Last updated on September 11, 2026.

Other flights from St. Louis

Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from St. Louis to Belfast
Explore the most affordable flight options available from St. Louis to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2026.

Best flights from St. Louis to Belfast
Discover carefully curated flight deals from St. Louis to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.