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Cheap flights from St. Louis to London from £219

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 12/8. 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

Cheap return flights

Logo
09:15 - 11:50STL-LHR
20h 35m1 stop
Logo
06:50 - 19:57LHR-STL
19h 07m2 stops
£361
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Tue, 9 Sep - Tue, 23 Sep
Logo
09:15 - 06:30STL-LHR
15h 15m2 stops
Logo
06:50 - 19:57LHR-STL
19h 07m2 stops
£362
Find Deal
Tue, 9 Sep - Tue, 23 Sep
Air Canada Logo
13:30 - 06:30STL-LHR
11h 00m1 stop
Air Canada Logo
08:40 - 19:38LHR-STL
16h 58m2 stops
£378Air Canada
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Sun, 7 Sep - Wed, 17 Sep
United Airlines Logo
17:27 - 11:15STL-LHR
11h 48m1 stop
United Airlines Logo
13:25 - 14:26LHR-STL
31h 01m2 stops
£380United Airlines
Find Deal
Mon, 8 Dec - Fri, 19 Dec
British Airways Logo
15:59 - 10:00STL-LHR
12h 01m1 stop
British Airways Logo
10:05 - 20:55LHR-STL
16h 50m1 stop
£381British Airways
Find Deal
Tue, 4 Nov - Tue, 11 Nov
United Airlines Logo
09:15 - 06:35STL-LHR
15h 20m1 stop
United Airlines Logo
14:05 - 10:49LHR-STL
26h 44m2 stops
£382United Airlines
Find Deal
Tue, 14 Oct - Wed, 22 Oct
Air Canada Logo
16:05 - 11:50STL-LHR
13h 45m1 stop
Air Canada Logo
08:40 - 19:38LHR-STL
16h 58m2 stops
£382Air Canada
Find Deal
Tue, 9 Sep - Wed, 17 Sep
British Airways Logo
17:09 - 12:45STL-LHR
13h 36m1 stop
British Airways Logo
14:25 - 20:26LHR-STL
12h 01m1 stop
£383British Airways
Find Deal
Tue, 14 Oct - Wed, 22 Oct
Virgin Atlantic Logo
10:20 - 06:20STL-LHR
14h 00m2 stops
Virgin Atlantic Logo
06:15 - 16:05LHR-STL
15h 50m2 stops
£395Virgin Atlantic
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Tue, 2 Sep - Tue, 16 Sep
Virgin Atlantic Logo
13:26 - 06:45STL-LHR
11h 19m1 stop
Virgin Atlantic Logo
11:20 - 17:54LHR-STL
12h 34m1 stop
£410Virgin Atlantic
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Tue, 19 Aug - Sun, 24 Aug

Air Canada flights from St. Louis to London

Our best Air Canada deals on St. Louis to London flight tickets
Air Canada
7 Sept
STL13:30Lambert-St Louis
11h 00m
1 stop
LHR06:30London Heathrow
17 Sept
LHR08:40London Heathrow
16h 58m
2 stops
STL19:38Lambert-St Louis
£378
Find similar
Air Canada
9 Sept
STL16:05Lambert-St Louis
13h 45m
1 stop
LHR11:50London Heathrow
17 Sept
LHR08:40London Heathrow
16h 58m
2 stops
STL19:38Lambert-St Louis
£382
Find similar
Air Canada
19 Aug
STL13:30Lambert-St Louis
14h 30m
1 stop
LHR10:00London Heathrow
27 Aug
LHR09:30London Heathrow
16h 30m
1 stop
STL20:00Lambert-St Louis
£386
Find similar

United Airlines flights from St. Louis to London

Our best United Airlines deals on St. Louis to London flight tickets
United Airlines
8 Dec
STL17:27Lambert-St Louis
11h 48m
1 stop
LHR11:15London Heathrow
19 Dec
LHR13:25London Heathrow
31h 01m
2 stops
STL14:26Lambert-St Louis
£380
Find similar
United Airlines
14 Oct
STL09:15Lambert-St Louis
15h 20m
1 stop
LHR06:35London Heathrow
22 Oct
LHR14:05London Heathrow
26h 44m
2 stops
STL10:49Lambert-St Louis
£382
Find similar
United Airlines
10 Sept
STL13:39Lambert-St Louis
14h 01m
1 stop
LHR09:40London Heathrow
16 Sept
LHR13:45London Heathrow
15h 59m
2 stops
STL23:44Lambert-St Louis
£384
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from St. Louis to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 5 August 2025.
Use the filters below to find and compare flights from St. Louis to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

09:15-11:50

1 stop20h 35m

London Heathrow

Tue 23/9

06:50-19:57

2 stops19h 07m

£361

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

09:15-06:30

2 stops15h 15m

London Heathrow

Tue 23/9

06:50-19:57

2 stops19h 07m

£362

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 7/9

13:30-06:30

1 stop11h 00m

London Heathrow

Wed 17/9

08:40-19:38

2 stops16h 58m

£378

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/12

17:27-11:15

1 stop11h 48m

London Heathrow

Fri 19/12

13:25-14:26

2 stops31h 01m

£380

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/11

15:59-10:00

1 stop12h 01m

London Heathrow

Tue 11/11

10:05-20:55

1 stop16h 50m

£381

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 14/10

09:15-06:35

1 stop15h 20m

London Heathrow

Wed 22/10

14:05-10:49

2 stops26h 44m

£382

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 9/9

16:05-11:50

1 stop13h 45m

London Heathrow

Wed 17/9

08:40-19:38

2 stops16h 58m

£382

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 14/10

17:09-12:45

1 stop13h 36m

London Heathrow

Wed 22/10

14:25-20:26

1 stop12h 01m

£383

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 2/9

10:20-06:20

2 stops14h 00m

London Heathrow

Tue 16/9

06:15-16:05

2 stops15h 50m

£395

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 19/8

13:26-06:45

1 stop11h 19m

London Heathrow

Sun 24/8

11:20-17:54

1 stop12h 34m

£410

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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?

The cheapest month to fly to London from St. Louis is in October. Flight prices, which tend to average around £572, are often lower during this time because this is during the off-season. The month of April is another great option to travel to London, with average flight prices from St. Louis averaging around £577.

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 £578. When flying out on a Thursday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to London for around £954.

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

The cheapest time of day to fly to London is in the morning when flights can be purchased for as low as £612. Flights in the evening are often more expensive, with an average ticket price of £1,097.

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 £707 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 £617 on momondo.

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

As of August 2025, prices for St. Louis to London flights are approximately 0% 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

Best price found

£219

Fastest flight time

10h 16m

Direct flights

None

Airports in London

6 airports
The best one-way flight to London from St. Louis in the past 72 hours is £219. The best return flight deal from St. Louis to London found on momondo in the last 72 hours is £361.
The fastest flight from St. Louis to London takes 10h 16m
There are no direct flights from St. Louis to London. Popular non-direct routes for this connection are Lambert-St Louis Airport - London Gatwick Airport, Lambert-St Louis Airport - London Southend Airport and Lambert-St Louis Airport - London Heathrow Airport.
There are 6 airports near London: London City (LCY), London Heathrow (LHR), London Luton (LTN), London Stansted (STN), London Gatwick (LGW), London Southend (SEN)
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  • 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 10h 16m.

  • 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?

  • 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 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
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom £440Free CancellationRating
7.1
9,879 reviews
Search Air Canada flights
British AirwaysPriceFrom £496Free CancellationRating
6.6
7,235 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £501Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
KLMPriceFrom £536Free CancellationRating
7.8
1,381 reviews
Search KLM flights

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Slough
Maidstone
Southend-on-Sea
Canterbury
Gatwick
Ipswich
Ilford
Guildford
Colchester
Dartford
Hounslow
Worthing
Dover
Chelmsford
Hayes
Winchester
Bedford

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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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
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport