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Cheap flights from St. Louis to London from £165

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 20/10. 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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0 bags

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Cheap return flights

Scandinavian Airlines Logo
15:59 - 16:00STL-LHR
19h 01m2 stops
Scandinavian Airlines Logo
18:40 - 22:04LHR-STL
33h 24m2 stops
£439Scandinavian Airlines
Find Deal
Wed, 29 Oct - Fri, 7 Nov
Multiple Airlines Logo
16:33 - 10:10STL-LGW
35h 37m1 stop
Multiple Airlines Logo
14:00 - 15:38LGW-STL
30h 38m1 stop
£445Multiple Airlines
Find Deal
Sat, 18 Oct - Fri, 31 Oct
Multiple Airlines Logo
19:15 - 10:10STL-LGW
32h 55m2 stops
Multiple Airlines Logo
14:00 - 15:38LGW-STL
30h 38m1 stop
£446Multiple Airlines
Find Deal
Sat, 18 Oct - Fri, 31 Oct
United Airlines Logo
06:00 - 07:15STL-LHR
19h 15m1 stop
United Airlines Logo
06:30 - 13:55LHR-STL
13h 25m1 stop
£507United Airlines
Find Deal
Mon, 20 Oct - Wed, 5 Nov
United Airlines Logo
12:55 - 06:40STL-LHR
11h 45m1 stop
United Airlines Logo
12:05 - 09:22LHR-STL
27h 17m1 stop
£529United Airlines
Find Deal
Tue, 16 Dec - Fri, 9 Jan
Air Canada Logo
16:05 - 06:35STL-LHR
32h 30m1 stop
Air Canada Logo
13:25 - 15:29LHR-STL
31h 04m2 stops
£535Air Canada
Find Deal
Sat, 18 Oct - Fri, 31 Oct
Air Canada Logo
16:05 - 11:20STL-LHR
13h 15m1 stop
Air Canada Logo
18:00 - 15:29LHR-STL
27h 29m1 stop
£537Air Canada
Find Deal
Wed, 12 Nov - Tue, 18 Nov
Delta Logo
11:39 - 11:40STL-LHR
18h 01m1 stop
Delta Logo
06:20 - 18:35LHR-STL
18h 15m2 stops
£541Delta
Find Deal
Tue, 11 Nov - Tue, 18 Nov
Delta Logo
11:21 - 08:55STL-LHR
15h 34m2 stops
Delta Logo
11:30 - 22:04LHR-STL
16h 34m2 stops
£544Delta
Find Deal
Mon, 20 Oct - Wed, 5 Nov
Virgin Atlantic Logo
13:30 - 06:45STL-LHR
11h 15m1 stop
Virgin Atlantic Logo
08:55 - 17:47LHR-STL
13h 52m1 stop
£565Virgin Atlantic
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Mon, 20 Oct - Mon, 27 Oct

Scandinavian Airlines flights from St. Louis to London

Our best Scandinavian Airlines deals on St. Louis to London flight tickets
Scandinavian Airlines
29 Oct
STL15:59Lambert-St Louis
19h 01m
2 stops
LHR16:00London Heathrow
7 Nov
LHR18:40London Heathrow
33h 24m
2 stops
STL22:04Lambert-St Louis
£439
Find similar
Scandinavian Airlines
10 Nov
STL11:44Lambert-St Louis
23h 56m
2 stops
LHR17:40London Heathrow
17 Nov
LHR06:40London Heathrow
23h 00m
2 stops
STL23:40Lambert-St Louis
£449
Find similar
Scandinavian Airlines
15 Jan
STL11:51Lambert-St Louis
24h 39m
2 stops
LHR18:30London Heathrow
26 Jan
LHR06:40London Heathrow
23h 00m
2 stops
STL23:40Lambert-St Louis
£450
Find similar

Air Canada flights from St. Louis to London

Our best Air Canada deals on St. Louis to London flight tickets
Air Canada
18 Oct
STL16:05Lambert-St Louis
32h 30m
1 stop
LHR06:35London Heathrow
31 Oct
LHR13:25London Heathrow
31h 04m
2 stops
STL15:29Lambert-St Louis
£535
Find similar
Air Canada
12 Nov
STL16:05Lambert-St Louis
13h 15m
1 stop
LHR11:20London Heathrow
18 Nov
LHR18:00London Heathrow
27h 29m
1 stop
STL15:29Lambert-St Louis
£537
Find similar
Air Canada
11 Jan
STL18:40Lambert-St Louis
30h 30m
2 stops
LHR07:10London Heathrow
31 Mar
LHR15:50London Heathrow
26h 30m
2 stops
STL12:20Lambert-St Louis
£545
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 22 September 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

Wed 29/10

15:59-16:00

2 stops19h 01m

London Heathrow

Fri 7/11

18:40-22:04

2 stops33h 24m

£439

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sat 18/10

16:33-10:10

1 stop35h 37m

London Gatwick

Fri 31/10

14:00-15:38

1 stop30h 38m

£445

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sat 18/10

19:15-10:10

2 stops32h 55m

London Gatwick

Fri 31/10

14:00-15:38

1 stop30h 38m

£446

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 20/10

06:00-07:15

1 stop19h 15m

London Heathrow

Wed 5/11

06:30-13:55

1 stop13h 25m

£507

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 16/12

12:55-06:40

1 stop11h 45m

London Heathrow

Fri 9/1

12:05-09:22

1 stop27h 17m

£529

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 18/10

16:05-06:35

1 stop32h 30m

London Heathrow

Fri 31/10

13:25-15:29

2 stops31h 04m

£535

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 12/11

16:05-11:20

1 stop13h 15m

London Heathrow

Tue 18/11

18:00-15:29

1 stop27h 29m

£537

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 11/11

11:39-11:40

1 stop18h 01m

London Heathrow

Tue 18/11

06:20-18:35

2 stops18h 15m

£541

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 20/10

11:21-08:55

2 stops15h 34m

London Heathrow

Wed 5/11

11:30-22:04

2 stops16h 34m

£544

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 20/10

13:30-06:45

1 stop11h 15m

London Heathrow

Mon 27/10

08:55-17:47

1 stop13h 52m

£565

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 £539, 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 £560.

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 £570. 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 £940.

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 £604. Flights in the evening are often more expensive, with an average ticket price of £1,082.

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 £681 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 £554 on momondo.

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

As of September 2025, prices for St. Louis to London flights are approximately 21% 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 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

Direct flights

None
There are no direct flights from St. Louis to London. There are no popular flight routes from St. Louis to London.
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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 25m.

  • 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 £434Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
Virgin AtlanticPriceFrom £468Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £489Free CancellationRating
6.7
7,386 reviews
Search British Airways flights
KLMPriceFrom £502Free CancellationRating
7.8
1,387 reviews
Search KLM flights

Travelling to a place near London?

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

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