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 8 different airlines that fly to London 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?

Toronto (YYZ) has the shortest average layover time for this route: 2h 04m.

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.

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

Chicago (ORD) was the most common stop: 42% 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?

Virgin Atlantic, United Airlines, and Delta 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.

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 April 2026, there are 8 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.

$346 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 $918 to $666. The lowest price recently found on this route was $799.

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

8:23 pm - 6:20 am

STL

LGW

27h 57m

2 stops

2:00 pm - 12:21 am

LGW

STL

16h 21m

1 stop

$799Multiple Airlines

Mon, May 4 - Fri, May 8

8:21 pm - 10:00 am

STL

LGW

55h 39m

2 stops

2:00 pm - 12:14 am

LGW

STL

16h 14m

1 stop

$800Multiple Airlines

Mon, Jul 20 - Fri, Aug 28

4:59 pm - 6:20 am

STL

LGW

31h 21m

2 stops

2:00 pm - 12:21 am

LGW

STL

16h 21m

1 stop

$804Multiple Airlines

Mon, Apr 27 - Fri, May 8

1:30 pm - 9:40 pm

STL

LHR

26h 10m

2 stops

6:40 am - 11:37 pm

LHR

STL

22h 57m

2 stops

$822Scandinavian Airlines

Sun, Sep 6 - Sat, Sep 12

5:36 pm - 1:05 pm

STL

LHR

13h 29m

1 stop

8:40 am - 11:21 pm

LHR

STL

20h 41m

2 stops

$830Virgin Atlantic

Sun, May 10 - Tue, May 19

1:54 pm - 9:25 am

STL

LGW

13h 31m

2 stops

10:25 am - 8:50 pm

LGW

STL

16h 25m

2 stops

$884Delta

Sun, Aug 2 - Wed, Aug 19

3:30 pm - 5:55 pm

STL

LCY

20h 25m

1 stop

9:15 am - 11:00 pm

LCY

STL

19h 45m

2 stops

$905Lufthansa

Wed, Aug 19 - Fri, Aug 28

6:55 pm - 5:55 pm

STL

LCY

17h 00m

2 stops

9:15 am - 11:00 pm

LCY

STL

19h 45m

2 stops

$909Lufthansa

Wed, Aug 19 - Fri, Aug 28

2:18 pm - 9:30 am

STL

LCY

13h 12m

2 stops

10:00 am - 8:50 pm

LCY

STL

16h 50m

2 stops

$950Delta

Tue, Aug 11 - Fri, Aug 21

12:47 pm - 9:10 am

STL

LCY

38h 23m

2 stops

8:25 pm - 11:41 pm

LCY

STL

33h 16m

2 stops

$1,026British Airways

Tue, Sep 29 - Mon, Oct 12

Scandinavian Airlines flights from St. Louis to London

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

Scandinavian Airlines

Sep 6

STL1:30 pmLambert-St Louis

26h 10m

2 stops

LHR9:40 pmLondon Heathrow

Sep 12

LHR6:40 amLondon Heathrow

22h 57m

2 stops

STL11:37 pmLambert-St Louis

$822

Scandinavian Airlines

Sep 6

STL3:42 pmLambert-St Louis

19h 58m

2 stops

LHR5:40 pmLondon Heathrow

Sep 12

LHR6:40 amLondon Heathrow

20h 10m

2 stops

STL8:50 pmLambert-St Louis

$823

Scandinavian Airlines

Oct 5

STL3:42 pmLambert-St Louis

18h 18m

2 stops

LHR4:00 pmLondon Heathrow

Oct 13

LHR6:40 amLondon Heathrow

22h 59m

2 stops

STL11:39 pmLambert-St Louis

$825

British Airways flights from St. Louis to London

Our best British Airways deals on St. Louis to London flight tickets

British Airways

Oct 6

STL9:35 pmLambert-St Louis

8h 00m

LHR11:35 amLondon Heathrow

Oct 16

LHR4:25 pmLondon Heathrow

9h 05m

STL7:30 pmLambert-St Louis

$871

British Airways

Oct 6

STL4:51 pmLambert-St Louis

10h 34m

1 stop

LHR9:25 amLondon Heathrow

Oct 16

LHR4:25 pmLondon Heathrow

9h 05m

STL7:30 pmLambert-St Louis

$875

British Airways

Apr 15

STL2:12 pmLambert-St Louis

10h 43m

1 stop

LHR6:55 amLondon Heathrow

Apr 22

LHR4:25 pmLondon Heathrow

9h 05m

STL7:30 pmLambert-St Louis

$877

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 5/4

8:23 pm-6:20 am

2 stops27h 57m

London Gatwick

Fri 5/8

2:00 pm-12:21 am

1 stop16h 21m

$799

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 7/20

8:21 pm-10:00 am

2 stops55h 39m

London Gatwick

Fri 8/28

2:00 pm-12:14 am

1 stop16h 14m

$800

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 4/27

4:59 pm-6:20 am

2 stops31h 21m

London Gatwick

Fri 5/8

2:00 pm-12:21 am

1 stop16h 21m

$804

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 9/6

1:30 pm-9:40 pm

2 stops26h 10m

London Heathrow

Sat 9/12

6:40 am-11:37 pm

2 stops22h 57m

$822

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 5/10

5:36 pm-1:05 pm

1 stop13h 29m

London Heathrow

Tue 5/19

8:40 am-11:21 pm

2 stops20h 41m

$830

Quickest round-trip

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sun 8/2

1:54 pm-9:25 am

2 stops13h 31m

London Gatwick

Wed 8/19

10:25 am-8:50 pm

2 stops16h 25m

$884

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 8/19

3:30 pm-5:55 pm

1 stop20h 25m

London City

Fri 8/28

9:15 am-11:00 pm

2 stops19h 45m

$905

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Wed 8/19

6:55 pm-5:55 pm

2 stops17h 00m

London City

Fri 8/28

9:15 am-11:00 pm

2 stops19h 45m

$909

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 8/11

2:18 pm-9:30 am

2 stops13h 12m

London City

Fri 8/21

10:00 am-8:50 pm

2 stops16h 50m

$950

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 9/29

12:47 pm-9:10 am

2 stops38h 23m

London City

Mon 10/12

8:25 pm-11:41 pm

2 stops33h 16m

$1,026

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 $682.

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 $693. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,101. 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 $846 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 $700 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?

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 April 2026, prices for St. Louis to London flights are approximately 41% more expensive 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	$488
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 $488. The best round-trip flight deal from St. Louis to London found on momondo in the last 72 hours is $963.

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

Frequently asked questions about flying from St. Louis to London

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 April 2026, there are 8 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 96.42% of the total bookings. Other popular models include Boeing 787-9 Dreamliner with 3.02%, Airbus A330-300 with 0.45%, and Embraer 175 with 0.11%.
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 38% of the total bookings. Other popular airlines include American Airlines with 21%, United Airlines with 14%, and Delta 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
Delta	PriceFrom $483	Free Cancellation	Rating 7.9 8,408 reviews	Search Delta flights
KLM	PriceFrom $529	Free Cancellation	Rating 7.8 1,496 reviews	Search KLM flights
British Airways	PriceFrom $538	Free Cancellation	Rating 6.7 7,880 reviews	Search British Airways flights
American Airlines	PriceFrom $563	Free Cancellation	Rating 7.1 11,571 reviews	Search American Airlines flights
Air Canada	PriceFrom $572	Free Cancellation	Rating 7.1 10,918 reviews	Search Air Canada flights
Iberia	PriceFrom $577	Free Cancellation	Rating 7.0 3,178 reviews	Search Iberia flights
United Airlines	PriceFrom $580	Free Cancellation	Rating 7.4 9,579 reviews	Search United Airlines flights
Lufthansa	PriceFrom $635	Free Cancellation	Rating 6.8 7,919 reviews	Search Lufthansa flights

Gatwick

Hounslow

Milton Keynes

Luton

Dover

Hayes

Slough

Wembley

Crawley

Stansted

Croydon

Dartford

Brentwood

Cobham

Folkestone

Guildford

Romford

Harrow

Watford

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

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

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Wed 5/13

Wed 5/20

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Nearby airports

Airlines

Cabin classes

Other United Kingdom destinations

Other flights from St. Louis

Complete your trip

Feeling lucky

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

Cheap flights from St. Louis to London from $346

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 6/21. 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

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from St. Louis to London

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Scandinavian Airlines flights from St. Louis to London

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

British Airways flights from St. Louis to London

Our best British Airways deals on St. Louis to London flight tickets

momondo Fare Finder

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

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

Frequently asked questions about flying 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?

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.

Popular cities in the United Kingdom

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

Fly to other destinations from St. Louis

According to popular flight searches on momondo this year

Complete your trip to London

Explore popular destinations other users love

According to popular flight searches on momondo this year