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

Lufthansa and United Airlines are the most popular carriers operating from Lambert-St Louis to London Heathrow

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

Atlanta (ATL) has the shortest average stopover time for this route: 1h 41m.

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

Atlanta (ATL) was the most common stop: 88% of momondo users choosing one-stop flights on this route connected there.

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

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 10h 53m.

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

Flights via Atlanta (ATL) offer the lowest average return price of £610.

Which airlines fly to London Heathrow Airport?

Virgin Atlantic, British Airways and Air Canada are the top three most popular airlines that fly to London Heathrow Airport from St. Louis according to our data. Virgin Atlantic is the first choice among our users, with 43% of people opting to fly with this airline when travelling to London Heathrow Airport. Keep in mind that there are 4 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

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 4 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?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£193 Cheap Flights from St. Louis to London Heathrow Airport in 2025/26

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

Prices are currently low for flights on this route. Typical prices usually range from £547 to £1,084. The lowest price recently found on this route was £490.

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Find the cheapest flights from St. Louis to London

Round-trip

One-way

Last minute

Direct

Cheap return flights

Enter your travel dates to find the best prices.

05:00 - 06:30

STL

LHR

20h 30m2 stops

14:10 - 12:25

LHR

STL

28h 15m2 stops

£491Air Canada

Sun, 22 Mar - Tue, 31 Mar

06:30 - 06:30

STL

LHR

18h 00m2 stops

12:40 - 16:40

LHR

STL

34h 00m2 stops

£491United Airlines

Tue, 21 Apr - Tue, 28 Apr

10:19 - 08:05

STL

LHR

15h 46m2 stops

06:30 - 14:38

LHR

STL

14h 08m2 stops

£492Delta

Sun, 18 Jan - Wed, 1 Apr

17:00 - 06:30

STL

LHR

31h 30m1 stop

08:40 - 23:01

LHR

STL

20h 21m2 stops

£493Delta

Sat, 18 Apr - Tue, 28 Apr

12:44 - 10:50

STL

LHR

16h 06m1 stop

20:15 - 17:43

LHR

STL

27h 28m2 stops

£494Lufthansa

Thu, 15 Jan - Mon, 26 Jan

22:00 - 12:05

STL

LHR

8h 05mdirect

13:10 - 20:02

LHR

STL

12h 52m1 stop

£495British Airways

Sun, 10 May - Fri, 22 May

11:28 - 06:20

STL

LHR

13h 52m1 stop

07:25 - 21:03

LHR

STL

19h 38m2 stops

£496Lufthansa

Tue, 24 Mar - Wed, 1 Apr

16:05 - 21:00

STL

LHR

22h 55m2 stops

14:05 - 14:27

LHR

STL

30h 22m2 stops

£496Air Canada

Sat, 18 Apr - Tue, 28 Apr

16:05 - 21:00

STL

LHR

22h 55m2 stops

17:50 - 15:24

LHR

STL

27h 34m2 stops

£497Air Canada

Sat, 18 Apr - Mon, 27 Apr

11:20 - 07:55

STL

LHR

14h 35m1 stop

12:00 - 21:05

LHR

STL

15h 05m2 stops

£498United Airlines

Wed, 11 Feb - Wed, 18 Feb

Air Canada flights from St. Louis to London Heathrow Airport

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

Air Canada

22 Mar

STL05:00Lambert-St Louis

20h 30m

2 stops

LHR06:30London Heathrow

31 Mar

LHR14:10London Heathrow

28h 15m

2 stops

STL12:25Lambert-St Louis

£490

Find similar

Air Canada

18 Apr

STL16:05Lambert-St Louis

22h 55m

2 stops

LHR21:00London Heathrow

28 Apr

LHR14:05London Heathrow

30h 22m

2 stops

STL14:27Lambert-St Louis

£496

Find similar

Air Canada

18 Apr

STL16:05Lambert-St Louis

32h 30m

1 stop

LHR06:35London Heathrow

27 Apr

LHR17:50London Heathrow

27h 34m

2 stops

STL15:24Lambert-St Louis

£497

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

18 Jan

STL10:19Lambert-St Louis

15h 46m

2 stops

LHR08:05London Heathrow

1 Apr

LHR06:30London Heathrow

14h 08m

2 stops

STL14:38Lambert-St Louis

£492

Find similar

Delta

18 Apr

STL17:00Lambert-St Louis

31h 30m

1 stop

LHR06:30London Heathrow

28 Apr

LHR08:40London Heathrow

20h 21m

2 stops

STL23:01Lambert-St Louis

£493

Find similar

Delta

30 Jan

STL09:59Lambert-St Louis

16h 46m

2 stops

LHR08:45London Heathrow

6 Feb

LHR06:30London Heathrow

17h 20m

2 stops

STL17:50Lambert-St Louis

£518

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

Sun 22/3

05:00-06:30

2 stops20h 30m

London Heathrow

Tue 31/3

14:10-12:25

2 stops28h 15m

£490

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 21/4

06:30-06:30

2 stops18h 00m

London Heathrow

Tue 28/4

12:40-16:40

2 stops34h 00m

£491

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 18/1

10:19-08:05

2 stops15h 46m

London Heathrow

Wed 1/4

06:30-14:38

2 stops14h 08m

£492

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 18/4

17:00-06:30

1 stop31h 30m

London Heathrow

Tue 28/4

08:40-23:01

2 stops20h 21m

£493

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 15/1

12:44-10:50

1 stop16h 06m

London Heathrow

Mon 26/1

20:15-17:43

2 stops27h 28m

£494

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 10/5

22:00-12:05

Nonstop8h 05m

London Heathrow

Fri 22/5

13:10-20:02

1 stop12h 52m

£495

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 24/3

11:28-06:20

1 stop13h 52m

London Heathrow

Wed 1/4

07:25-21:03

2 stops19h 38m

£496

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 18/4

16:05-21:00

2 stops22h 55m

London Heathrow

Tue 28/4

14:05-14:27

2 stops30h 22m

£496

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 18/4

16:05-21:00

2 stops22h 55m

London Heathrow

Mon 27/4

17:50-15:24

2 stops27h 34m

£497

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 11/2

11:20-07:55

1 stop14h 35m

London Heathrow

Wed 18/2

12:00-21:05

2 stops15h 05m

£498

Flights are sorted by cheapest return 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

Stopovers

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?

In general, October is the cheapest month to fly from St. Louis to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £525. The month of November is another great option to travel to London Heathrow Airport, with average flight prices from St. Louis averaging around £531.

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

On average, the least expensive day to fly to London Heathrow Airport from St. Louis is on a Thursday. momondo users have found tickets for Thursday departures for as low as £642. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Monday is £804.

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 morning. momondo users have found flights departing from St. Louis to London Heathrow Airport in the morning for as low as £673. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £834 on average. Flights to London Heathrow Airport from St. Louis in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 £661 when searching weeks before you fly. 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 £575 on momondo.

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 return 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

Fastest flight time	8h 05m
Direct flights	Mon, Wed, Thu and Sat

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 4 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?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek 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 this flight route, the most popular plane model on flight routes from St. Louis to London Heathrow Airport is Boeing 787-8 Dreamliner (100.00% of 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 Virgin Atlantic, representing 43% of all bookings. The subsequent popular airlines are British Airways at 30%, Air Canada at 13%, and KLM at 13%.

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 £368	Free Cancellation	Rating 7.7 1,428 reviews	Search KLM flights
Virgin Atlantic	PriceFrom £411	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £433	Free Cancellation	Rating 6.7 7,585 reviews	Search British Airways flights
Air Canada	PriceFrom £437	Free Cancellation	Rating 7.1 10,534 reviews	Search Air Canada flights

Eastbourne

Milton Keynes

Luton

Gatwick

Maidstone

Slough

Northampton

Swindon

Stratford-upon-Avon

Southend-on-Sea

Canterbury

Ipswich

Ilford

Poole

Guildford

Swanage

Hayes

Chelmsford

Dover

Worthing

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?

Yes. All flights to London from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search for St. Louis to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Yes. momondo can track prices for St. Louis to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your London Heathrow Airport trip

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Cheap flights from St. Louis to London from £193

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 2/2. 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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Air Canada flights from St. Louis to London Heathrow Airport

Our best Air Canada 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 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?

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

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

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

Lufthansa and United Airlines are the most popular carriers operating from Lambert-St Louis to London Heathrow

Which airlines fly to London Heathrow Airport?

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

Atlanta (ATL) was the most common stop: 88% of momondo users choosing one-stop flights on this route connected there.

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

Flights via Atlanta (ATL) offer the lowest average return price of £610.

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

Flights connecting via Atlanta (ATL) have the shortest average one-way travel time: 10h 53m.

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

Atlanta (ATL) has the shortest average stopover time for this route: 1h 41m.

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

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

Travelling 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, organise 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