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

Flights via Dallas (DFW) offer the lowest average return price of £528.

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

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

Which airlines fly to London?

Virgin Atlantic, British Airways and United Airlines are the top three most popular airlines that fly to London from St. Louis according to our data. Virgin Atlantic is the first choice among our users, with 48% of people opting to fly with this airline when travelling to London. Keep in mind that there are 3 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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

Atlanta (ATL) was the most common stop: 70% 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?

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 10h 45m.

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

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 March 2026, there are 3 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?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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.

£174 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 £519 to £691. The lowest price recently found on this route was £493.

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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.

15:30 - 16:40

STL

LHR

19h 10m

1 stop

06:30 - 13:25

LHR

STL

12h 55m

1 stop

£493Lufthansa

Wed, 19 Aug - Fri, 28 Aug

16:05 - 17:05

STL

STN

19h 00m

2 stops

06:30 - 15:25

STN

STL

14h 55m

2 stops

£495Multiple Airlines

Mon, 13 Apr - Mon, 20 Apr

19:09 - 18:40

STL

LHR

17h 31m

2 stops

07:25 - 21:08

LHR

STL

19h 43m

2 stops

£495Lufthansa

Tue, 5 May - Tue, 19 May

19:09 - 16:40

STL

LHR

15h 31m

2 stops

09:00 - 23:57

LHR

STL

20h 57m

2 stops

£496Lufthansa

Tue, 5 May - Tue, 19 May

12:10 - 06:30

STL

LHR

12h 20m

1 stop

08:40 - 18:27

LHR

STL

15h 47m

2 stops

£499Air Canada

Wed, 26 Aug - Wed, 2 Sep

05:00 - 08:35

STL

LHR

21h 35m

2 stops

06:50 - 20:02

LHR

STL

19h 12m

2 stops

£502Air Canada

Wed, 19 Aug - Tue, 1 Sep

17:59 - 13:45

STL

LHR

14h 46m

2 stops

11:30 - 23:58

LHR

STL

18h 28m

2 stops

£504Delta

Tue, 24 Mar - Tue, 31 Mar

14:32 - 15:15

STL

LCY

18h 43m

2 stops

19:15 - 22:17

LCY

STL

33h 02m

2 stops

£537Iberia

Tue, 14 Apr - Tue, 21 Apr

14:32 - 15:15

STL

LCY

18h 43m

2 stops

19:15 - 19:33

LCY

STL

30h 18m

2 stops

£549Iberia

Tue, 21 Apr - Tue, 28 Apr

12:28 - 07:55

STL

LCY

13h 27m

2 stops

09:20 - 20:42

LCY

STL

17h 22m

2 stops

£570Delta

Fri, 3 Apr - Thu, 9 Apr

Delta flights from St. Louis to London

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

Delta

24 Mar

STL17:59Lambert-St Louis

14h 46m

2 stops

LHR13:45London Heathrow

31 Mar

LHR11:30London Heathrow

18h 28m

2 stops

STL23:58Lambert-St Louis

£504

Delta

30 Mar

STL06:32Lambert-St Louis

18h 38m

1 stop

LHR07:10London Heathrow

10 Apr

LHR08:40London Heathrow

18h 26m

2 stops

STL21:06Lambert-St Louis

£507

Delta

30 Mar

STL13:39Lambert-St Louis

14h 51m

2 stops

LHR10:30London Heathrow

8 Apr

LHR08:40London Heathrow

18h 02m

2 stops

STL20:42Lambert-St Louis

£510

United Airlines flights from St. Louis to London

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

United Airlines

8 Mar

STL05:00Lambert-St Louis

21h 55m

1 stop

LHR07:55London Heathrow

17 Mar

LHR18:00London Heathrow

26h 29m

1 stop

STL15:29Lambert-St Louis

£505

United Airlines

28 Apr

STL06:15Lambert-St Louis

21h 45m

2 stops

LHR10:00London Heathrow

7 May

LHR06:50London Heathrow

15h 49m

2 stops

STL16:39Lambert-St Louis

£506

United Airlines

26 Apr

STL07:45Lambert-St Louis

16h 45m

2 stops

LHR06:30London Heathrow

5 May

LHR06:50London Heathrow

15h 49m

2 stops

STL16:39Lambert-St Louis

£509

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 19/8

15:30-16:40

1 stop19h 10m

London Heathrow

Fri 28/8

06:30-13:25

1 stop12h 55m

£493

St. LouisLondon

STL - STN

STLSTN

Lambert-St Louis

Mon 13/4

16:05-17:05

2 stops19h 00m

London Stansted

Mon 20/4

06:30-15:25

2 stops14h 55m

£495

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/5

19:09-18:40

2 stops17h 31m

London Heathrow

Tue 19/5

07:25-21:08

2 stops19h 43m

£495

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/5

19:09-16:40

2 stops15h 31m

London Heathrow

Tue 19/5

09:00-23:57

2 stops20h 57m

£496

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 26/8

12:10-06:30

1 stop12h 20m

London Heathrow

Wed 2/9

08:40-18:27

2 stops15h 47m

£499

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 19/8

05:00-08:35

2 stops21h 35m

London Heathrow

Tue 1/9

06:50-20:02

2 stops19h 12m

£502

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 24/3

17:59-13:45

2 stops14h 46m

London Heathrow

Tue 31/3

11:30-23:58

2 stops18h 28m

£504

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 14/4

14:32-15:15

2 stops18h 43m

London City

Tue 21/4

19:15-22:17

2 stops33h 02m

£537

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Tue 21/4

14:32-15:15

2 stops18h 43m

London City

Tue 28/4

19:15-19:33

2 stops30h 18m

£548

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Fri 3/4

12:28-07:55

2 stops13h 27m

London City

Thu 9/4

09:20-20:42

2 stops17h 22m

£570

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

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?

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 £504, 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 £524.

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

Our data shows that Wednesday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £805. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to London for around £869.

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 £643 when searching weeks before you fly. 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 £552 on momondo.

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

As of March 2026, prices for St. Louis to London flights are approximately 7% 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 return 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

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

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. A reasonable flight in good conditions will take 8h 00m.
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 March 2026, there are 3 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?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to 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 this flight route, the most popular plane model on flight routes from St. Louis to London is Boeing 787-8 Dreamliner (95.11% of total bookings). The next most popular plane models are Boeing 787-9 Dreamliner (4.36%) and Airbus A330-300 (0.53%).
What is the most popular airline from St. Louis to London?
momondo data reveals that the most frequently booked airline on the route from St. Louis to London is British Airways, representing 100% of all bookings.

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
Virgin Atlantic	PriceFrom £412	Free Cancellation	Rating 7.5 680 reviews	Search Virgin Atlantic flights
British Airways	PriceFrom £434	Free Cancellation	Rating 6.7 7,774 reviews	Search British Airways flights
United Airlines	PriceFrom £507	Free Cancellation	Rating 7.4 9,382 reviews	Search United Airlines flights

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Slough

Southend-on-Sea

Canterbury

Ipswich

Ilford

Wembley

Guildford

Chelmsford

Hayes

Dover

Folkestone

Worthing

Colchester

Bedford

Ramsgate

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to London . Millions of users trust and use momondo every year so you are in good hands.

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?

momondo provides multiple filters to help you find the best flight to London from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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.

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Cheap flights from St. Louis to London from £174

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 26/3. 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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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?

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

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

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

Which airlines fly to London?

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

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

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

Which stopover 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

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Best airlines flying from St. Louis to London

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

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Airports listed have a maximum distance of 35.6 mi from London

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