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

Chicago (ORD) was the most common stop: 61% of momondo users choosing 1-stop flights on this route connected there.

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.

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 45% 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 has the shortest connection time from St. Louis to London Heathrow Airport?

Frankfurt am Main (FRA) has the shortest average layover time for this route: 1h 35m.

What is the cheapest airline that flies from Lambert-St Louis to London Heathrow?

British Airways is the most popular carrier operating from Lambert-St Louis to London Heathrow

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.

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 January 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.

$292 Cheap Flights from St. Louis to London Heathrow Airport in 2026

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Cheap round-trip flights

Enter your travel dates to find the best prices.

1:00 pm - 6:30 am

STL

LHR

11h 30m1 stop

10:50 am - 9:04 pm

LHR

STL

16h 14m2 stops

$655United Airlines

mar., may. 5 - mar., may. 12

1:00 pm - 6:30 am

STL

LHR

11h 30m1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m1 stop

$656United Airlines

mié., may. 6 - mié., may. 13

6:05 pm - 12:20 pm

STL

LHR

12h 15m1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m1 stop

$657United Airlines

lun., abr. 13 - vie., abr. 24

3:30 pm - 4:40 pm

STL

LHR

19h 10m1 stop

7:30 pm - 1:25 pm

LHR

STL

23h 55m1 stop

$658Lufthansa

mié., abr. 8 - jue., abr. 16

9:10 am - 6:30 am

STL

LHR

15h 20m2 stops

9:00 am - 9:08 pm

LHR

STL

18h 08m2 stops

$659United Airlines

mié., abr. 15 - mié., abr. 22

9:45 am - 8:55 am

STL

LHR

17h 10m2 stops

6:30 am - 2:24 pm

LHR

STL

13h 54m2 stops

$660Delta

lun., mar. 30 - mié., abr. 8

1:11 pm - 7:55 am

STL

LHR

12h 44m1 stop

6:55 am - 9:04 pm

LHR

STL

20h 09m2 stops

$661Lufthansa

mar., feb. 17 - jue., may. 14

6:00 am - 10:30 am

STL

LHR

22h 30m1 stop

4:25 pm - 7:30 pm

LHR

STL

9h 05mnonstop

$662British Airways

vie., abr. 10 - vie., abr. 24

6:59 pm - 11:40 am

STL

LHR

11h 41m1 stop

8:00 pm - 11:09 am

LHR

STL

20h 09m2 stops

$663Delta

mar., mar. 10 - lun., mar. 23

6:00 am - 10:30 am

STL

LHR

22h 30m1 stop

2:45 pm - 10:14 pm

LHR

STL

13h 29m1 stop

$664British Airways

vie., abr. 10 - vie., abr. 24

Lufthansa flights from St. Louis to London Heathrow Airport

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

Lufthansa

Apr 8

STL3:30 pmLambert-St Louis

19h 10m

1 stop

LHR4:40 pmLondon Heathrow

Apr 16

LHR7:30 pmLondon Heathrow

23h 55m

1 stop

STL1:25 pmLambert-St Louis

$658

Find similar

Lufthansa

Feb 17

STL1:11 pmLambert-St Louis

10h 44m

1 stop

LHR5:55 amLondon Heathrow

May 13

LHR6:55 amLondon Heathrow

20h 09m

2 stops

STL9:04 pmLambert-St Louis

$661

Find similar

Lufthansa

Jan 15

STL12:44 pmLambert-St Louis

11h 56m

1 stop

LHR6:40 amLondon Heathrow

Jan 26

LHR8:15 pmLondon Heathrow

27h 28m

2 stops

STL5:43 pmLambert-St Louis

$664

Find similar

Delta flights from St. Louis to London Heathrow Airport

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

Delta

Mar 30

STL9:45 amLambert-St Louis

17h 10m

2 stops

LHR8:55 amLondon Heathrow

Apr 8

LHR6:30 amLondon Heathrow

13h 54m

2 stops

STL2:24 pmLambert-St Louis

$660

Find similar

Delta

Mar 10

STL1:39 pmLambert-St Louis

15h 36m

2 stops

LHR10:15 amLondon Heathrow

Mar 23

LHR8:00 pmLondon Heathrow

20h 09m

2 stops

STL11:09 amLambert-St Louis

$663

Find similar

Delta

Apr 17

STL7:15 amLambert-St Louis

17h 10m

1 stop

LHR6:25 amLondon Heathrow

Apr 24

LHR6:15 amLondon Heathrow

17h 39m

2 stops

STL5:54 pmLambert-St Louis

$668

Find similar

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

mar. 5/5

1:00 pm-6:30 am

1 stop11h 30m

London Heathrow

mar. 5/12

10:50 am-9:04 pm

2 stops16h 14m

$655

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 5/6

1:00 pm-6:30 am

1 stop11h 30m

London Heathrow

mié. 5/13

6:30 am-1:25 pm

1 stop12h 55m

$656

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 4/13

6:05 pm-12:20 pm

1 stop12h 15m

London Heathrow

vie. 4/24

6:30 am-1:25 pm

1 stop12h 55m

$657

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 4/8

3:30 pm-4:40 pm

1 stop19h 10m

London Heathrow

jue. 4/16

7:30 pm-1:25 pm

1 stop23h 55m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 4/15

9:10 am-6:30 am

2 stops15h 20m

London Heathrow

mié. 4/22

9:00 am-9:08 pm

2 stops18h 08m

$659

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 3/30

9:45 am-8:55 am

2 stops17h 10m

London Heathrow

mié. 4/8

6:30 am-2:24 pm

2 stops13h 54m

$660

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 2/17

1:11 pm-7:55 am

1 stop12h 44m

London Heathrow

jue. 5/14

6:55 am-9:04 pm

2 stops20h 09m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

vie. 4/10

6:00 am-10:30 am

1 stop22h 30m

London Heathrow

vie. 4/24

4:25 pm-7:30 pm

Nonstop9h 05m

$662

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mar. 3/10

6:59 pm-11:40 am

1 stop11h 41m

London Heathrow

lun. 3/23

8:00 pm-11:09 am

2 stops20h 09m

$663

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

vie. 4/10

6:00 am-10:30 am

1 stop22h 30m

London Heathrow

vie. 4/24

2:45 pm-10:14 pm

1 stop13h 29m

$664

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 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 $686. 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 $668. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,101.

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 $854 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.

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

As of January 2026, prices for St. Louis to London Heathrow Airport flights are approximately 5% 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	$459
Fastest flight time	8h 05m
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 $459. The best round-trip flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is $688.

The fastest flight from St. Louis to London Heathrow Airport takes 8h 05m

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 05m.
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 January 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 97.38% of the total bookings. Other popular models include Boeing 787-9 Dreamliner with 2.62%.
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 35% of all bookings. The subsequent popular airlines are American Airlines at 19%, 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 1,434 reviews	Search KLM flights
Air Canada	PriceFrom $573	Free Cancellation	Rating 7.1 10,598 reviews	Search Air Canada flights
Delta	PriceFrom $577	Free Cancellation	Rating 7.9 8,017 reviews	Search Delta flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 9,134 reviews	Search United Airlines flights
British Airways	PriceFrom $580	Free Cancellation	Rating 6.7 7,657 reviews	Search British Airways flights
Iberia	PriceFrom $597	Free Cancellation	Rating 7.0 3,073 reviews	Search Iberia flights
Scandinavian Airlines	PriceFrom $602	Free Cancellation	Rating 7.4 1,633 reviews	Search Scandinavian Airlines flights
American Airlines	PriceFrom $604	Free Cancellation	Rating 7.2 11,083 reviews	Search American 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 7,683 reviews	Search Lufthansa flights

Gatwick

Luton

Hounslow

Milton Keynes

Dover

Slough

Guildford

Hayes

Crawley

Dartford

Stratford-upon-Avon

Brentwood

Salisbury

Watford

Wembley

Cobham

Folkestone

Romford

Richmond

Uxbridge

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.

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Cheap flights from St. Louis to London from $292

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 1/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Lufthansa flights from St. Louis to London Heathrow Airport

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

Delta flights from St. Louis to London Heathrow Airport

Our best Delta 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 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 $668. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,101.

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.

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

As of January 2026, prices for St. Louis to London Heathrow Airport flights are approximately 5% cheaper when compared to flights at the same time last year.

What is the cheapest airline that flies from Lambert-St Louis to London Heathrow?

British Airways is the most popular carrier operating from Lambert-St Louis to London Heathrow

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: 61% 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?

Frankfurt am Main (FRA) has the shortest average layover time for this route: 1h 35m.

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