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

Chicago (ORD) was the most common stop: 29% 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?

Flights connecting via Toronto (YYZ) have the shortest average one-way travel time: 10h 30m.

What airlines fly to London?

British Airways, American Airlines and United Airlines are the top three most popular airlines that fly to London from St. Louis according to our data. British Airways is the first choice among our users, with 41% of people opting to fly with this airline when traveling to London. Keep in mind that there are 9 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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

United Airlines, Delta, and British Airways are the most popular carriers operating from Lambert-St Louis to London

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

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

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

Dallas (DFW) has the shortest average layover time for this route: 1h 28m.

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

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

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

As of February 2026, there are 9 operators available to choose from for flights from Lambert-St Louis Airport to London.

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

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.

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

The travel and health documents you'll need for your trip to London 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. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$267 Cheap Flights from St. Louis to London in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $692 to $922. The lowest price recently found on this route was $648.

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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.

1:39 pm - 7:10 am

STL

LHR

11h 31m

1 stop

11:45 am - 11:36 pm

LHR

STL

17h 51m

2 stops

$648KLM

Wed, Apr 8 - Wed, Apr 15

6:30 am - 6:30 am

STL

LHR

18h 00m

2 stops

8:40 am - 8:05 pm

LHR

STL

17h 25m

2 stops

$649Air Canada

Tue, Apr 28 - Wed, May 6

11:22 am - 9:00 am

STL

LGW

16h 38m

2 stops

10:45 am - 11:46 pm

LGW

STL

19h 01m

2 stops

$650American Airlines

Mon, Mar 23 - Tue, Apr 7

4:05 pm - 11:50 am

STL

LHR

13h 45m

1 stop

6:30 am - 1:25 pm

LHR

STL

12h 55m

1 stop

$650Multiple Airlines

Tue, Apr 28 - Wed, May 6

12:25 pm - 10:35 am

STL

LHR

16h 10m

2 stops

6:15 am - 10:17 pm

LHR

STL

22h 02m

2 stops

$651Iberia

Tue, Apr 7 - Tue, Apr 14

12:25 pm - 10:50 am

STL

LGW

16h 25m

2 stops

8:40 pm - 10:17 pm

LGW

STL

31h 37m

2 stops

$651Iberia

Wed, Apr 8 - Wed, Apr 15

6:49 pm - 6:25 pm

STL

LHR

17h 36m

2 stops

7:30 pm - 1:25 pm

LHR

STL

23h 55m

1 stop

$652Lufthansa

Mon, Aug 17 - Mon, Aug 24

6:59 pm - 1:15 pm

STL

LHR

12h 16m

1 stop

9:55 am - 11:25 pm

LHR

STL

19h 30m

2 stops

$656Delta

Mon, Mar 30 - Fri, Apr 10

1:39 pm - 4:00 pm

STL

LGW

20h 21m

2 stops

10:25 am - 9:19 pm

LGW

STL

16h 54m

2 stops

$667Delta

Wed, Apr 8 - Wed, Apr 15

2:00 pm - 1:50 pm

STL

LCY

18h 50m

2 stops

8:25 pm - 11:02 pm

LCY

STL

32h 37m

2 stops

$819British Airways

Wed, Mar 25 - Wed, Apr 1

Air Canada flights from St. Louis to London

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

Air Canada

Apr 28

STL6:30 amLambert-St Louis

18h 00m

2 stops

LHR6:30 amLondon Heathrow

May 6

LHR8:40 amLondon Heathrow

17h 25m

2 stops

STL8:05 pmLambert-St Louis

$649

Air Canada

Apr 21

STL4:05 pmLambert-St Louis

13h 45m

1 stop

LHR11:50 amLondon Heathrow

May 5

LHR5:15 pmLondon Heathrow

32h 50m

2 stops

STL8:05 pmLambert-St Louis

$654

Air Canada

Mar 1

STL4:05 pmLambert-St Louis

46h 30m

2 stops

LHR8:35 pmLondon Heathrow

Mar 13

LHR6:00 pmLondon Heathrow

27h 23m

2 stops

STL4:23 pmLambert-St Louis

$657

United Airlines flights from St. Louis to London

Our best United Airlines deals on St. Louis to London flight tickets

United Airlines

Mar 1

STL6:00 pmLambert-St Louis

33h 40m

1 stop

LHR9:40 amLondon Heathrow

Mar 13

LHR1:00 pmLondon Heathrow

31h 29m

1 stop

STL3:29 pmLambert-St Louis

$654

United Airlines

Aug 16

STL12:10 pmLambert-St Louis

12h 20m

1 stop

LHR6:30 amLondon Heathrow

Aug 26

LHR6:50 amLondon Heathrow

14h 48m

2 stops

STL3:38 pmLambert-St Louis

$664

United Airlines

Mar 30

STL6:05 pmLambert-St Louis

33h 35m

1 stop

LHR9:40 amLondon Heathrow

Apr 14

LHR2:10 pmLondon Heathrow

31h 14m

1 stop

STL3:24 pmLambert-St Louis

$670

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 4/8

1:39 pm-7:10 am

1 stop11h 31m

London Heathrow

Wed 4/15

11:45 am-11:36 pm

2 stops17h 51m

$648

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/28

6:30 am-6:30 am

2 stops18h 00m

London Heathrow

Wed 5/6

8:40 am-8:05 pm

2 stops17h 25m

$649

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 3/23

11:22 am-9:00 am

2 stops16h 38m

London Gatwick

Tue 4/7

10:45 am-11:46 pm

2 stops19h 01m

$650

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/28

4:05 pm-11:50 am

1 stop13h 45m

London Heathrow

Wed 5/6

6:30 am-1:25 pm

1 stop12h 55m

$650

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/7

12:25 pm-10:35 am

2 stops16h 10m

London Heathrow

Tue 4/14

6:15 am-10:17 pm

2 stops22h 02m

$651

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 4/8

12:25 pm-10:50 am

2 stops16h 25m

London Gatwick

Wed 4/15

8:40 pm-10:17 pm

2 stops31h 37m

$651

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/17

6:49 pm-6:25 pm

2 stops17h 36m

London Heathrow

Mon 8/24

7:30 pm-1:25 pm

1 stop23h 55m

$652

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/30

6:59 pm-1:15 pm

1 stop12h 16m

London Heathrow

Fri 4/10

9:55 am-11:25 pm

2 stops19h 30m

$656

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 4/8

1:39 pm-4:00 pm

2 stops20h 21m

London Gatwick

Wed 4/15

10:25 am-9:19 pm

2 stops16h 54m

$667

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 3/25

2:00 pm-1:50 pm

2 stops18h 50m

London City

Wed 4/1

8:25 pm-11:02 pm

2 stops32h 37m

$819

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

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?

What is the cheapest month to fly to London?

The cheapest month to fly to London from St. Louis is in January. Flight prices, which tend to average around $672, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from St. Louis averaging around $699.

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

The cheapest day to depart from St. Louis to London is on a Monday. Travelers who choose to depart for London on a Monday will often find tickets for as low as $688. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $989. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

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

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

You are more likely to see cheaper flights to London from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $859 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from St. Louis for as low as $786 on momondo.

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

There are 3 cabin classes available to choose from on Lambert-St Louis to London 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 flights?

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

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

As of February 2026, prices for St. Louis to London flights are approximately 10% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to London

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

Estimated round-trip price

Cheap St. Louis to London (STL to LON) flight deals and tips

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

Best Price Found	$436
Fastest flight time	8h 00m
Direct flights	Mon, Wed, Thu and Sat
Airports in London	6 airports

The best one-way flight to London from St. Louis in the past 72 hours is $436. The best round-trip flight deal from St. Louis to London found on momondo in the last 72 hours is $797.

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

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

There are 6 airports in London. From St. Louis there are direct flights to London Heathrow (LHR).

Search flight deals

How far is Lambert-St Louis to London by plane?
London is 4197.7 mi away from Lambert-St Louis. Flights usually cover this in 8h 00m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to London?
Prices for flights from Lambert-St Louis Airport to London were last updated today.
How many operators does momondo search for flights from Lambert-St Louis Airport to London?
As of February 2026, there are 9 operators available to choose from for flights from Lambert-St Louis Airport to London.
How old do you have to be to fly from Lambert-St Louis Airport to London?
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.
What documentation or ID do you need to fly to London?
The travel and health documents you'll need for your trip to London 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. 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?
Based on momondo bookings for flights between St. Louis and London, the leading plane model is Boeing 787-8 Dreamliner, making up 94.79% of the total bookings. Other popular models include Boeing 787-9 Dreamliner with 4.65% and Airbus A330-300 with 0.56%.
What is the most popular airline from St. Louis to London?
Based on momondo bookings for flights between St. Louis and London, the leading airline is British Airways, making up 33% of the total bookings. Other popular airlines include American Airlines with 21%, United Airlines with 17%, and Iberia with 9%.

Best airlines flying from St. Louis to London

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

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $529	Free Cancellation	Rating 7.7 1,460 reviews	Search KLM flights
British Airways	PriceFrom $538	Free Cancellation	Rating 6.7 7,764 reviews	Search British Airways flights
Air Canada	PriceFrom $572	Free Cancellation	Rating 7.1 10,745 reviews	Search Air Canada flights
Delta	PriceFrom $577	Free Cancellation	Rating 7.9 8,238 reviews	Search Delta flights
Iberia	PriceFrom $580	Free Cancellation	Rating 7.0 3,123 reviews	Search Iberia flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 9,346 reviews	Search United Airlines flights
American Airlines	PriceFrom $596	Free Cancellation	Rating 7.2 11,342 reviews	Search American Airlines flights
Scandinavian Airlines	PriceFrom $602	Free Cancellation	Rating 7.3 1,699 reviews	Search Scandinavian Airlines flights
Lufthansa	PriceFrom $668	Free Cancellation	Rating 6.8 7,809 reviews	Search Lufthansa flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Slough

Crawley

Hayes

Wembley

Dartford

Brentwood

Croydon

Guildford

Harrow

Watford

Cobham

Folkestone

Romford

Stansted

Richmond

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to London for you.

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

momondo does allow users to show only those flights to London from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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?

If you are not ready to book a flight from St. Louis to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

An easier way to manage your London trip

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London Stansted Airport

Cheap flights from St. Louis to London from $267

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 3/26. 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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Find the cheapest flights from St. Louis to London

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Air Canada flights from St. Louis to London

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

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Our best United Airlines deals on St. Louis to London flight tickets

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See travel insights to London from

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

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

What is the cheapest month to fly to London?

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

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

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

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

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

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

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

What airlines fly to London?

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

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

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

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

When to book flights from St. Louis to London

Cheap St. Louis to London (STL to LON) flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in London

Best airlines flying from St. Louis to London

Compare and see reviews for airlines that fly from St. Louis to London 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 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 the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London

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

List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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

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