Which airport is the most popular layover for flights between St. Louis and London Heathrow Airport?

Chicago (ORD) was the most common stop: 45% of momondo users choosing 1-stop flights on this route connected there.

What airlines fly to London Heathrow Airport?

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to London Heathrow Airport from St. Louis according to our data. British Airways is the first choice among our users, with 43% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 10 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from St. Louis to London Heathrow Airport?

Flights via Philadelphia (PHL) offer the lowest average round-trip price of $703.

Which layover airport has the shortest travel time from St. Louis to London Heathrow Airport?

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 11h 00m.

Which layover airport has the shortest connection time from St. Louis to London Heathrow Airport?

Atlanta (ATL) has the shortest average layover time for this route: 1h 49m.

When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?

Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.

How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?

As of February 2026, there are 10 operators available to choose from for flights from Lambert-St Louis Airport to London Heathrow Airport.

How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?

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 London Heathrow Airport.

What documentation or ID do you need to fly to London Heathrow Airport?

The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$290 Cheap Flights from St. Louis to London Heathrow Airport in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to London

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:55 pm - 11:15 am

STL

LHR

10h 20m

1 stop

6:30 am - 1:55 pm

LHR

STL

13h 25m

1 stop

$637Lufthansa

Mon, Feb 23 - Wed, Mar 4

4:49 pm - 10:55 pm

STL

LHR

24h 06m

2 stops

7:30 pm - 2:55 pm

LHR

STL

24h 25m

1 stop

$640Lufthansa

Tue, Mar 3 - Tue, Mar 10

4:05 pm - 11:20 am

STL

LHR

13h 15m

1 stop

11:10 am - 11:51 pm

LHR

STL

17h 41m

2 stops

$641Multiple Airlines

Wed, Mar 4 - Thu, Mar 12

3:15 pm - 11:15 am

STL

LHR

14h 00m

1 stop

6:35 am - 6:00 pm

LHR

STL

16h 25m

2 stops

$642United Airlines

Tue, Mar 3 - Tue, Mar 10

6:10 am - 7:05 am

STL

LHR

18h 55m

1 stop

10:00 am - 8:43 pm

LHR

STL

16h 43m

2 stops

$643Virgin Atlantic

Mon, Feb 23 - Wed, Mar 4

9:55 am - 7:10 am

STL

LHR

15h 15m

2 stops

11:10 am - 10:59 pm

LHR

STL

16h 49m

2 stops

$645United Airlines

Tue, Mar 3 - Tue, Mar 10

6:35 pm - 5:40 pm

STL

LHR

17h 05m

2 stops

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$646Lufthansa

Mon, Mar 30 - Fri, Apr 10

11:25 am - 6:40 am

STL

LHR

13h 15m

2 stops

6:50 am - 4:02 pm

LHR

STL

15h 12m

2 stops

$647United Airlines

Tue, Feb 24 - Tue, Mar 3

10:13 am - 6:50 am

STL

LHR

14h 37m

2 stops

10:00 am - 8:43 pm

LHR

STL

16h 43m

2 stops

$648Virgin Atlantic

Mon, Feb 23 - Wed, Mar 4

7:41 am - 7:10 am

STL

LHR

17h 29m

2 stops

1:30 pm - 10:59 pm

LHR

STL

15h 29m

2 stops

$649Multiple Airlines

Mon, Feb 23 - Wed, Mar 4

Lufthansa flights from St. Louis to London Heathrow Airport

Our best Lufthansa deals on St. Louis to London Heathrow Airport flight tickets

Lufthansa

Feb 23

STL6:55 pmLambert-St Louis

10h 20m

1 stop

LHR11:15 amLondon Heathrow

Mar 4

LHR6:30 amLondon Heathrow

13h 25m

1 stop

STL1:55 pmLambert-St Louis

$637

Lufthansa

Mar 3

STL4:49 pmLambert-St Louis

24h 06m

2 stops

LHR10:55 pmLondon Heathrow

Mar 10

LHR7:30 pmLondon Heathrow

24h 25m

1 stop

STL2:55 pmLambert-St Louis

$640

Lufthansa

Mar 30

STL6:35 pmLambert-St Louis

17h 05m

2 stops

LHR5:40 pmLondon Heathrow

Apr 10

LHR6:30 amLondon Heathrow

12h 55m

1 stop

STL1:25 pmLambert-St Louis

$646

British Airways flights from St. Louis to London Heathrow Airport

Our best British Airways deals on St. Louis to London Heathrow Airport flight tickets

British Airways

Feb 10

STL3:20 pmLambert-St Louis

13h 05m

1 stop

LHR10:25 amLondon Heathrow

Feb 17

LHR8:20 amLondon Heathrow

14h 53m

1 stop

STL5:13 pmLambert-St Louis

$661

British Airways

Apr 1

STL6:33 pmLambert-St Louis

9h 57m

1 stop

LHR10:30 amLondon Heathrow

Apr 22

LHR4:25 pmLondon Heathrow

9h 05m

STL7:30 pmLambert-St Louis

$667

British Airways

Mar 3

STL2:00 pmLambert-St Louis

10h 35m

1 stop

LHR6:35 amLondon Heathrow

Mar 10

LHR8:20 amLondon Heathrow

16h 09m

1 stop

STL7:29 pmLambert-St Louis

$668

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/23

6:55 pm-11:15 am

1 stop10h 20m

London Heathrow

Wed 3/4

6:30 am-1:55 pm

1 stop13h 25m

$637

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 3/3

4:49 pm-10:55 pm

2 stops24h 06m

London Heathrow

Tue 3/10

7:30 pm-2:55 pm

1 stop24h 25m

$640

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 3/4

4:05 pm-11:20 am

1 stop13h 15m

London Heathrow

Thu 3/12

11:10 am-11:51 pm

2 stops17h 41m

$641

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 3/3

3:15 pm-11:15 am

1 stop14h 00m

London Heathrow

Tue 3/10

6:35 am-6:00 pm

2 stops16h 25m

$642

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/23

6:10 am-7:05 am

1 stop18h 55m

London Heathrow

Wed 3/4

10:00 am-8:43 pm

2 stops16h 43m

$643

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 3/3

9:55 am-7:10 am

2 stops15h 15m

London Heathrow

Tue 3/10

11:10 am-10:59 pm

2 stops16h 49m

$645

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/30

6:35 pm-5:40 pm

2 stops17h 05m

London Heathrow

Fri 4/10

6:30 am-1:25 pm

1 stop12h 55m

$646

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 2/24

11:25 am-6:40 am

2 stops13h 15m

London Heathrow

Tue 3/3

6:50 am-4:02 pm

2 stops15h 12m

$647

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/23

10:13 am-6:50 am

2 stops14h 37m

London Heathrow

Wed 3/4

10:00 am-8:43 pm

2 stops16h 43m

$648

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/23

7:41 am-7:10 am

2 stops17h 29m

London Heathrow

Wed 3/4

1:30 pm-10:59 pm

2 stops15h 29m

$649

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to London Heathrow Airport

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

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between St. Louis and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from St. Louis, with most prices found around $678. If you’re not able to fly to London Heathrow Airport in October, then November is your next best option. Flight prices from St. Louis to London Heathrow Airport during November average around $709.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Monday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $688. The most expensive day to fly to London Heathrow Airport is Sunday, with ticket prices averaging around $866.

What is the cheapest Lambert-St Louis to London Heathrow flight route?

Fly from Lambert-St Louis to London Heathrow for the best Lambert-St Louis - London Heathrow flight prices

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $862 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from St. Louis for as low as $768 on momondo.

What cabin class options are available on Lambert-St Louis to London Heathrow flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to London Heathrow Airport flights?

You could potentially save up to 2% on your flight if you consider stops on a St. Louis to London Heathrow Airport flight.

How have St. Louis to London Heathrow Airport flight prices changed over time?

As of February 2026, prices for St. Louis to London Heathrow Airport flights are approximately 14% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to London Heathrow Airport

Best Price Found	$465
Fastest flight time	8h 00m
Direct flights	Mon, Wed, Thu and Sat

The best one-way flight to London Heathrow Airport from St. Louis in the past 72 hours is $465. The best round-trip flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is $669.

The fastest flight from St. Louis to London Heathrow Airport takes 8h 00m

Direct flights go from St. Louis to London Heathrow Airport on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.

Search flight deals

How far is Lambert-St Louis to London Heathrow by plane?
Lambert-St Louis and London Heathrow are 4185.8 mi apart from one another. By plane, this route typically takes 8h 00m.
When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?
Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?
As of February 2026, there are 10 operators available to choose from for flights from Lambert-St Louis Airport to London Heathrow Airport.
How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?
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 London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to London Heathrow Airport?
Based on momondo bookings for flights between St. Louis and London Heathrow Airport, the leading plane model is Boeing 787-8 Dreamliner, making up 94.93% of the total bookings. Other popular models include Boeing 787-9 Dreamliner with 5.07%.
What is the most popular airline from St. Louis to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from St. Louis to London Heathrow Airport is British Airways, representing 34% of all bookings. The subsequent popular airlines are American Airlines at 21%, United Airlines at 17%, and Iberia at 10%.

Best airlines flying from St. Louis to London Heathrow Airport

Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $529	Free Cancellation	Rating 7.7 1,450 reviews	Search KLM flights
Air Canada	PriceFrom $573	Free Cancellation	Rating 7.1 10,697 reviews	Search Air Canada flights
British Airways	PriceFrom $574	Free Cancellation	Rating 6.7 7,719 reviews	Search British Airways flights
Delta	PriceFrom $577	Free Cancellation	Rating 7.9 8,159 reviews	Search Delta flights
Iberia	PriceFrom $580	Free Cancellation	Rating 7.0 3,106 reviews	Search Iberia flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 9,244 reviews	Search United Airlines flights
American Airlines	PriceFrom $596	Free Cancellation	Rating 7.2 11,247 reviews	Search American Airlines flights
Scandinavian Airlines	PriceFrom $602	Free Cancellation	Rating 7.3 1,678 reviews	Search Scandinavian Airlines flights
Virgin Atlantic	PriceFrom $615	Free Cancellation	Rating 7.5 678 reviews	Search Virgin Atlantic flights
Lufthansa	PriceFrom $668	Free Cancellation	Rating 6.8 7,769 reviews	Search Lufthansa flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Guildford

Crawley

Wembley

Dartford

Stratford-upon-Avon

Hayes

Croydon

Brentwood

Harrow

Watford

Cobham

Folkestone

Romford

Stansted

Why use momondo?

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

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 London from St. Louis.

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

Flights from St. Louis to London 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 London?

Once all potential St. Louis to London 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 London right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to London 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 London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Sun 3/8

Sun 3/15

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London

Popular cities

Other flights from St. Louis

Other flights to London

Airlines

Cabin classes

Complete your trip

Feeling lucky

Popular cities in the United Kingdom

Flights to London Gatwick Airportfrom $181

Flights to London City Airportfrom $472

Flights to London Stansted Airportfrom $333

Flights to London Luton Airportfrom $345

Flights to Glasgow Intl Airportfrom $359

Flights to Belfast Intl Airportfrom $465

Flights to London Southend Airportfrom $457

Flights to Belfast City Airportfrom $554

Cheap flights from St. Louis to London from $290

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to London departing on 2/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from St. Louis to London

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Lufthansa flights from St. Louis to London Heathrow Airport

Our best Lufthansa deals on St. Louis to London Heathrow Airport flight tickets

British Airways flights from St. Louis to London Heathrow Airport

Our best British Airways deals on St. Louis to London Heathrow Airport flight tickets

momondo Fare Finder

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

See travel insights to London from

How to get the cheapest flight ticket from St. Louis to London Heathrow Airport

What is the typical price of a round-trip flight between St. Louis and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Monday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $688. The most expensive day to fly to London Heathrow Airport is Sunday, with ticket prices averaging around $866.

What is the cheapest Lambert-St Louis to London Heathrow flight route?

Fly from Lambert-St Louis to London Heathrow for the best Lambert-St Louis - London Heathrow flight prices

How far in advance should I book a flight to London Heathrow Airport?

What cabin class options are available on Lambert-St Louis to London Heathrow flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to London Heathrow Airport flights?

You could potentially save up to 2% on your flight if you consider stops on a St. Louis to London Heathrow Airport flight.

How have St. Louis to London Heathrow Airport flight prices changed over time?

As of February 2026, prices for St. Louis to London Heathrow Airport flights are approximately 14% cheaper when compared to flights at the same time last year.

What airlines fly to London Heathrow Airport?

Which airport is the most popular layover for flights between St. Louis and London Heathrow Airport?

Chicago (ORD) was the most common stop: 45% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from St. Louis to London Heathrow Airport?

Flights via Philadelphia (PHL) offer the lowest average round-trip price of $703.

Which layover airport has the shortest travel time from St. Louis to London Heathrow Airport?

Flights connecting via Montreal (YUL) have the shortest average one-way travel time: 11h 00m.

Which layover airport has the shortest connection time from St. Louis to London Heathrow Airport?

Atlanta (ATL) has the shortest average layover time for this route: 1h 49m.

When to book flights from St. Louis to London Heathrow Airport

Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to London Heathrow Airport

Best Price Found

Fastest flight time

Direct flights

How far is Lambert-St Louis to London Heathrow by plane?

When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?

How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?

How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?

What documentation or ID do you need to fly to London Heathrow Airport?

What is the most popular plane model from St. Louis to London Heathrow Airport?

What is the most popular airline from St. Louis to London Heathrow Airport?

Best airlines flying from St. Louis to London Heathrow Airport

Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo

Traveling to a place near London?

Why use momondo?

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

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

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

I’m not ready to book a flight from St. Louis to London right now. Can momondo alert me if prices change?

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize 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.

Find better results for your trip to London

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

St. Louis flight routes

According to popular flight searches on momondo this year

London Heathrow Airport flight routes

According to popular flight searches on momondo this year

Fly your favorite airline to London

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to London