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

Chicago (ORD) was the most common stop: 70% of momondo users choosing 1-stop flights on this route connected there.

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

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

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 44% 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.

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.

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 December 2025, 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.

$286 Cheap Flights from St. Louis to London Heathrow Airport in 2025/26

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Find the cheapest flights from St. Louis to London

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Cheap round-trip flights

Enter your travel dates to find the best prices.

6:35 pm - 7:55 am

STL

LHR

31h 20m1 stop

6:00 pm - 3:29 pm

LHR

STL

27h 29m1 stop

$655Multiple Airlines

อา., ธ.ค. 28 - พ., ม.ค. 14

1:39 pm - 9:20 am

STL

LHR

14h 41m2 stops

6:30 am - 4:16 pm

LHR

STL

15h 46m2 stops

$658Delta

พ., มี.ค. 18 - พ., เม.ย. 8

1:15 pm - 5:55 am

STL

LHR

10h 40m1 stop

8:30 am - 10:58 pm

LHR

STL

20h 28m2 stops

$661Lufthansa

อา., ม.ค. 18 - อา., ม.ค. 25

11:22 am - 8:25 am

STL

LHR

15h 03m1 stop

4:00 pm - 11:59 pm

LHR

STL

13h 59m1 stop

$662Austrian Airlines

พ., ม.ค. 28 - จ., ก.พ. 2

4:05 pm - 8:35 pm

STL

LHR

46h 30m2 stops

11:10 am - 3:29 pm

LHR

STL

34h 19m1 stop

$664Air Canada

ศ., ม.ค. 23 - ศ., ก.พ. 13

9:57 am - 5:55 am

STL

LHR

13h 58m1 stop

10:25 am - 7:27 pm

LHR

STL

15h 02m1 stop

$666United Airlines

อ., ก.พ. 3 - อ., ก.พ. 10

4:49 pm - 5:55 am

STL

LHR

31h 06m1 stop

7:30 pm - 1:55 pm

LHR

STL

24h 25m1 stop

$668Lufthansa

ส., ม.ค. 17 - ส., ม.ค. 24

12:44 pm - 9:45 am

STL

LHR

15h 01m2 stops

8:45 am - 10:58 pm

LHR

STL

20h 13m2 stops

$669Lufthansa

พฤ., ม.ค. 22 - อ., ม.ค. 27

4:05 pm - 7:10 am

STL

LHR

33h 05m2 stops

7:30 pm - 3:29 pm

LHR

STL

49h 59m2 stops

$671Multiple Airlines

จ., ม.ค. 19 - จ., ม.ค. 26

6:40 pm - 11:15 am

STL

LHR

10h 35m1 stop

10:25 am - 5:43 pm

LHR

STL

13h 18m1 stop

$677Lufthansa

จ., ม.ค. 19 - จ., ม.ค. 26

Delta flights from St. Louis to London Heathrow Airport

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

Delta

Mar 18

STL1:39 pmLambert-St Louis

14h 41m

2 stops

LHR9:20 amLondon Heathrow

Apr 8

LHR6:30 amLondon Heathrow

15h 46m

2 stops

STL4:16 pmLambert-St Louis

$658

Find similar

Delta

Jan 13

STL12:00 pmLambert-St Louis

14h 45m

2 stops

LHR8:45 amLondon Heathrow

Jan 18

LHR11:30 amLondon Heathrow

18h 09m

2 stops

STL11:39 pmLambert-St Louis

$699

Find similar

Delta

Jan 23

STL10:19 amLambert-St Louis

17h 56m

2 stops

LHR10:15 amLondon Heathrow

Jan 26

LHR6:30 amLondon Heathrow

17h 20m

2 stops

STL5:50 pmLambert-St Louis

$743

Find similar

Lufthansa flights from St. Louis to London Heathrow Airport

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

Lufthansa

Jan 18

STL1:15 pmLambert-St Louis

10h 40m

1 stop

LHR5:55 amLondon Heathrow

Jan 25

LHR8:30 amLondon Heathrow

20h 28m

2 stops

STL10:58 pmLambert-St Louis

$661

Find similar

Lufthansa

Jan 17

STL4:49 pmLambert-St Louis

31h 06m

1 stop

LHR5:55 amLondon Heathrow

Jan 24

LHR7:30 pmLondon Heathrow

24h 25m

1 stop

STL1:55 pmLambert-St Louis

$668

Find similar

Lufthansa

Jan 22

STL12:44 pmLambert-St Louis

15h 01m

2 stops

LHR9:45 amLondon Heathrow

Jan 27

LHR8:45 amLondon Heathrow

20h 13m

2 stops

STL10:58 pmLambert-St Louis

$669

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

อา. 12/28

6:35 pm-7:55 am

1 stop31h 20m

London Heathrow

พ. 1/14

6:00 pm-3:29 pm

1 stop27h 29m

$655

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

พ. 3/18

1:39 pm-9:20 am

2 stops14h 41m

London Heathrow

พ. 4/8

6:30 am-4:16 pm

2 stops15h 46m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

อา. 1/18

1:15 pm-5:55 am

1 stop10h 40m

London Heathrow

อา. 1/25

8:30 am-10:58 pm

2 stops20h 28m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

พ. 1/28

11:22 am-8:25 am

1 stop15h 03m

London Heathrow

จ. 2/2

4:00 pm-11:59 pm

1 stop13h 59m

$662

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

ศ. 1/23

4:05 pm-8:35 pm

2 stops46h 30m

London Heathrow

ศ. 2/13

11:10 am-3:29 pm

1 stop34h 19m

$664

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

อ. 2/3

9:57 am-5:55 am

1 stop13h 58m

London Heathrow

อ. 2/10

10:25 am-7:27 pm

1 stop15h 02m

$666

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

ส. 1/17

4:49 pm-5:55 am

1 stop31h 06m

London Heathrow

ส. 1/24

7:30 pm-1:55 pm

1 stop24h 25m

$668

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

พฤ. 1/22

12:44 pm-9:45 am

2 stops15h 01m

London Heathrow

อ. 1/27

8:45 am-10:58 pm

2 stops20h 13m

$669

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

จ. 1/19

4:05 pm-7:10 am

2 stops33h 05m

London Heathrow

จ. 1/26

7:30 pm-3:29 pm

2 stops49h 59m

$671

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

จ. 1/19

6:40 pm-11:15 am

1 stop10h 35m

London Heathrow

จ. 1/26

10:25 am-5:43 pm

1 stop13h 18m

$677

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 $702. 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 $710.

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

Our data shows that Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $658. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $814.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the evening. momondo users have found flights departing from St. Louis to London Heathrow Airport in the evening for as low as $770. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive with an average ticket price of $996.

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 $883 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 $769 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 6% on your flight if you consider stops on a St. Louis to London Heathrow Airport flight.

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	$413
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 $413. The best round-trip flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is $662.

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 December 2025, 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 100.00% of the total bookings.
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 1,431 reviews	Search KLM flights
Air Canada	PriceFrom $573	Free Cancellation	Rating 7.1 10,551 reviews	Search Air Canada flights
Delta	PriceFrom $577	Free Cancellation	Rating 7.9 8,014 reviews	Search Delta flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 9,102 reviews	Search United Airlines flights
British Airways	PriceFrom $580	Free Cancellation	Rating 6.7 7,602 reviews	Search British Airways flights
Iberia	PriceFrom $597	Free Cancellation	Rating 7.0 3,055 reviews	Search Iberia flights
Scandinavian Airlines	PriceFrom $602	Free Cancellation	Rating 7.4 1,617 reviews	Search Scandinavian Airlines flights
American Airlines	PriceFrom $610	Free Cancellation	Rating 7.2 11,052 reviews	Search American Airlines flights
Lufthansa	PriceFrom $670	Free Cancellation	Rating 6.8 7,643 reviews	Search Lufthansa flights
Virgin Atlantic	PriceFrom $736	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Stratford-upon-Avon

Crawley

Brentwood

Salisbury

Wembley

Watford

Ilford

Cobham

Folkestone

Romford

Richmond

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

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พ. 1/21

พ. 1/28

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Cheap flights from St. Louis to London from $286

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 2/4. 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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Delta flights from St. Louis to London Heathrow Airport

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

Lufthansa flights from St. Louis to London Heathrow Airport

Our best Lufthansa 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 Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $658. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $814.

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

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 6% on your flight if you consider stops on a St. Louis to London Heathrow Airport flight.

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

Lufthansa 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: 70% 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