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

Chicago (ORD) was the most common stop: 57% 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?

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

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

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

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

Flights via Toronto (YYZ) offer the lowest average round-trip price of $692.

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.

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 43% of people opting to fly with this airline when traveling to London. Keep in mind that there are 10 different airlines that fly to London 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?

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 November 2025, there are 10 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.

$304 Cheap Flights from St. Louis to London 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.

1:00 pm - 5:55 amSTL-LHR

10h 55m1 stop

10:25 am - 5:03 pmLHR-STL

12h 38m1 stop

$655Austrian Airlines

Find Deal

Wed, Dec 3 - Mon, Dec 8

4:05 pm - 8:30 amSTL-LHR

10h 25m1 stop

12:00 pm - 10:45 pmLHR-STL

16h 45m2 stops

$656Air Canada

Find Deal

Wed, Dec 3 - Fri, Dec 12

5:59 pm - 11:05 amSTL-LHR

11h 06m1 stop

10:25 am - 5:43 pmLHR-STL

13h 18m1 stop

$661United Airlines

Find Deal

Wed, Jan 7 - Thu, Jan 15

11:05 am - 7:55 amSTL-LHR

14h 50m1 stop

12:45 pm - 11:59 pmLHR-STL

17h 14m1 stop

$662Lufthansa

Find Deal

Thu, Jan 1 - Thu, Jan 15

4:05 pm - 11:20 amSTL-LHR

13h 15m1 stop

3:10 pm - 11:59 pmLHR-STL

14h 49m1 stop

$663United Airlines

Find Deal

Tue, Jan 6 - Tue, Jan 13

11:50 am - 6:20 amSTL-LHR

12h 30m1 stop

7:30 am - 9:40 pmLHR-STL

20h 10m2 stops

$669Lufthansa

Find Deal

Wed, Dec 3 - Sun, Dec 7

9:59 am - 8:10 amSTL-LCY

16h 11m2 stops

9:20 am - 8:43 pmLCY-STL

17h 23m2 stops

$718Virgin Atlantic

Find Deal

Fri, Feb 6 - Tue, Feb 10

9:59 am - 9:30 amSTL-LCY

17h 31m2 stops

9:20 am - 8:43 pmLCY-STL

17h 23m2 stops

$719Virgin Atlantic

Find Deal

Fri, Feb 6 - Tue, Feb 10

11:04 am - 1:50 pmSTL-LCY

20h 46m2 stops

3:30 pm - 8:38 pmLCY-STL

35h 08m2 stops

$746British Airways

Find Deal

Wed, Dec 3 - Mon, Dec 8

10:44 am - 3:30 pmSTL-LCY

22h 46m2 stops

8:40 am - 8:38 pmLCY-STL

17h 58m2 stops

$846British Airways

Find Deal

Sat, Nov 29 - Sat, Dec 6

Austrian Airlines flights from St. Louis to London

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

Austrian Airlines

Dec 3

STL1:00 pmLambert-St Louis

10h 55m

1 stop

LHR5:55 amLondon Heathrow

Dec 8

LHR10:25 amLondon Heathrow

12h 38m

1 stop

STL5:03 pmLambert-St Louis

$655

Find similar

Austrian Airlines

Dec 4

STL11:50 amLambert-St Louis

14h 35m

1 stop

LHR8:25 amLondon Heathrow

Dec 11

LHR4:00 pmLondon Heathrow

13h 42m

1 stop

STL11:42 pmLambert-St Louis

$670

Find similar

Austrian Airlines

Jan 22

STL11:22 amLambert-St Louis

15h 48m

1 stop

LHR9:10 amLondon Heathrow

Feb 4

LHR4:00 pmLondon Heathrow

13h 59m

1 stop

STL11:59 pmLambert-St Louis

$693

Find similar

United Airlines flights from St. Louis to London

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

United Airlines

Jan 7

STL5:59 pmLambert-St Louis

11h 06m

1 stop

LHR11:05 amLondon Heathrow

Jan 15

LHR10:25 amLondon Heathrow

13h 18m

1 stop

STL5:43 pmLambert-St Louis

$661

Find similar

United Airlines

Jan 6

STL4:05 pmLambert-St Louis

13h 15m

1 stop

LHR11:20 amLondon Heathrow

Jan 13

LHR3:10 pmLondon Heathrow

14h 49m

1 stop

STL11:59 pmLambert-St Louis

$663

Find similar

United Airlines

Jan 6

STL4:05 pmLambert-St Louis

13h 15m

1 stop

LHR11:20 amLondon Heathrow

Jan 13

LHR9:10 amLondon Heathrow

18h 03m

2 stops

STL9:13 pmLambert-St Louis

$668

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 12/3

1:00 pm-5:55 am

1 stop10h 55m

London Heathrow

Mon 12/8

10:25 am-5:03 pm

1 stop12h 38m

$655

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 12/3

4:05 pm-8:30 am

1 stop10h 25m

London Heathrow

Fri 12/12

12:00 pm-10:45 pm

2 stops16h 45m

$656

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 1/7

5:59 pm-11:05 am

1 stop11h 06m

London Heathrow

Thu 1/15

10:25 am-5:43 pm

1 stop13h 18m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 1/1

11:05 am-7:55 am

1 stop14h 50m

London Heathrow

Thu 1/15

12:45 pm-11:59 pm

1 stop17h 14m

$662

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 1/6

4:05 pm-11:20 am

1 stop13h 15m

London Heathrow

Tue 1/13

3:10 pm-11:59 pm

1 stop14h 49m

$663

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 12/3

11:50 am-6:20 am

1 stop12h 30m

London Heathrow

Sun 12/7

7:30 am-9:40 pm

2 stops20h 10m

$669

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Fri 2/6

9:59 am-8:10 am

2 stops16h 11m

London City

Tue 2/10

9:20 am-8:43 pm

2 stops17h 23m

$718

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Fri 2/6

9:59 am-9:30 am

2 stops17h 31m

London City

Tue 2/10

9:20 am-8:43 pm

2 stops17h 23m

$719

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 12/3

11:04 am-1:50 pm

2 stops20h 46m

London City

Mon 12/8

3:30 pm-8:38 pm

2 stops35h 08m

$746

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Sat 11/29

10:44 am-3:30 pm

2 stops22h 46m

London City

Sat 12/6

8:40 am-8:38 pm

2 stops17h 58m

$846

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 cheapest month to fly to London?

The cheapest month to fly to London from St. Louis is in November. Flight prices, which tend to average around $711, 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 $724.

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 $668. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $848. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from St. Louis in the evening is the least expensive time of day to depart. momondo users have found prices as low as $781 when looking at flights departing in the evening. Flights to London are more costly at noon, with an average ticket price of $958. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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 $900 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 $799 on momondo.

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

There are 2 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?

No. A direct flight is the cheapest option for a flight between St. Louis to London.

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

As of November 2025, prices for St. Louis to London flights are approximately 0% 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	$418
Fastest flight time	8h 05m
Direct flights	Mon, Wed, Thu and Sat
Airports in London	1 airport

The best one-way flight to London from St. Louis in the past 72 hours is $418. The best round-trip flight deal from St. Louis to London found on momondo in the last 72 hours is $598.

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

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

There is 1 airport near London: 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 10h 25m, 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 November 2025, there are 10 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 100.00% of the total bookings.
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 31% of the total bookings. Other popular airlines include American Airlines with 20%, United Airlines with 18%, and Iberia with 10%.

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 1,420 reviews	Search KLM flights
Air Canada	PriceFrom $573	Free Cancellation	Rating 7.1 10,468 reviews	Search Air Canada flights
Delta	PriceFrom $580	Free Cancellation	Rating 7.9 8,000 reviews	Search Delta flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 9,042 reviews	Search United Airlines flights
British Airways	PriceFrom $581	Free Cancellation	Rating 6.7 7,535 reviews	Search British Airways flights
Iberia	PriceFrom $597	Free Cancellation	Rating 7.0 3,033 reviews	Search Iberia flights
Scandinavian Airlines	PriceFrom $602	Free Cancellation	Rating 7.4 1,585 reviews	Search Scandinavian Airlines flights
American Airlines	PriceFrom $636	Free Cancellation	Rating 7.2 11,040 reviews	Search American Airlines flights
Lufthansa	PriceFrom $670	Free Cancellation	Rating 6.8 7,584 reviews	Search Lufthansa flights
Virgin Atlantic	PriceFrom $747	Free Cancellation	Rating 7.5 675 reviews	Search Virgin Atlantic flights

Gatwick

Hounslow

Milton Keynes

Dover

Luton

Slough

Guildford

Hayes

Dartford

Crawley

Brentwood

Chelmsford

Wembley

Folkestone

Romford

Ilford

Cobham

Stansted

Harrow

Watford

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

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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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Popular cities in the United Kingdom

Flights to Manchesterfrom $361

Flights to Edinburghfrom $377

Flights to Glasgowfrom $395

Flights to Birminghamfrom $383

Flights to Newcastle upon Tynefrom $519

Flights to Belfastfrom $482

Flights to Bristolfrom $409

Flights to Invernessfrom $406

Flights to Liverpoolfrom $455

Flights to Aberdeenfrom $523

Flights to Leedsfrom $461

Flights to Cardifffrom $545

Cheap flights from St. Louis to London from $304

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 12/15. 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

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Find the cheapest flights from St. Louis to London

Cheap round-trip flights

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Cheap last minute flights

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Austrian Airlines flights from St. Louis to London

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

United Airlines flights from St. Louis to London

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

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

See travel insights to London from

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

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 time of day to depart on your flight 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?

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

There are 2 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?

No. A direct flight is the cheapest option for a flight between St. Louis to London.

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

As of November 2025, prices for St. Louis to London flights are approximately 0% cheaper when compared to flights at the same time last year.

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

Lufthansa, Austrian Airlines, and United Airlines are the most popular carriers operating 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?

Chicago (ORD) was the most common stop: 57% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Toronto (YYZ) offer the lowest average round-trip price of $692.

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

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?

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

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

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

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

How many operators does momondo search 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?

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

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

What is the most popular airline from St. Louis to 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