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Cheap flights from St. Louis to London from £214

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 9/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap return flights

Enter your travel dates to find the best prices.
Austrian Airlines Logo
11:50 - 08:25STL-LHR
14h 35m1 stop
Austrian Airlines Logo
16:00 - 23:42LHR-STL
13h 42m1 stop
£500Austrian Airlines
Find Deal
Fri, 5 Dec - Thu, 11 Dec
Iberia Logo
22:00 - 12:05STL-LHR
8h 05mdirect
Iberia Logo
14:25 - 22:34LHR-STL
14h 09m1 stop
£502Iberia
Find Deal
Sun, 10 May - Fri, 22 May
Multiple Airlines Logo
15:43 - 06:00STL-LGW
32h 17m2 stops
Multiple Airlines Logo
14:00 - 22:34LGW-STL
14h 34m1 stop
£502Multiple Airlines
Find Deal
Thu, 8 Jan - Fri, 16 Jan
Delta Logo
12:49 - 08:10STL-LCY
13h 21m2 stops
Delta Logo
08:40 - 22:16LCY-STL
19h 36m2 stops
£504Delta
Find Deal
Mon, 8 Dec - Wed, 24 Dec
Air Canada Logo
16:05 - 08:30STL-LHR
10h 25m1 stop
Air Canada Logo
13:00 - 15:29LHR-STL
32h 29m1 stop
£504Air Canada
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Tue, 6 Jan - Wed, 14 Jan
United Airlines Logo
17:59 - 11:05STL-LHR
11h 06m1 stop
United Airlines Logo
10:25 - 17:43LHR-STL
13h 18m1 stop
£505United Airlines
Find Deal
Wed, 7 Jan - Thu, 15 Jan
British Airways Logo
19:03 - 12:30STL-LHR
11h 27m1 stop
British Airways Logo
11:00 - 19:03LHR-STL
14h 03m1 stop
£505British Airways
Find Deal
Wed, 8 Apr - Thu, 16 Apr
Multiple Airlines Logo
17:11 - 10:00STL-LGW
34h 49m1 stop
Multiple Airlines Logo
14:10 - 08:05LGW-STL
23h 55m1 stop
£505Multiple Airlines
Find Deal
Wed, 7 Jan - Sun, 11 Jan
Austrian Airlines Logo
11:22 - 21:20STL-LHR
27h 58m1 stop
Austrian Airlines Logo
16:00 - 23:59LHR-STL
13h 59m1 stop
£506Austrian Airlines
Find Deal
Tue, 6 Jan - Fri, 16 Jan
Virgin Atlantic Logo
09:59 - 08:10STL-LCY
16h 11m2 stops
Virgin Atlantic Logo
09:20 - 20:43LCY-STL
17h 23m2 stops
£548Virgin Atlantic
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Fri, 6 Feb - Tue, 10 Feb

Air Canada flights from St. Louis to London

Our best Air Canada deals on St. Louis to London flight tickets
Air Canada
3 Dec
STL16:05Lambert-St Louis
10h 25m
1 stop
LHR08:30London Heathrow
12 Dec
LHR12:00London Heathrow
16h 45m
2 stops
STL22:45Lambert-St Louis
£501
Find similar
Air Canada
6 Jan
STL16:05Lambert-St Louis
10h 25m
1 stop
LHR08:30London Heathrow
14 Jan
LHR13:00London Heathrow
32h 29m
1 stop
STL15:29Lambert-St Louis
£504
Find similar
Air Canada
7 Jan
STL11:20Lambert-St Louis
18h 00m
2 stops
LHR11:20London Heathrow
16 Jan
LHR18:00London Heathrow
27h 29m
1 stop
STL15:29Lambert-St Louis
£507
Find similar

Lufthansa flights from St. Louis to London

Our best Lufthansa deals on St. Louis to London flight tickets
Lufthansa
19 Apr
STL15:30Lambert-St Louis
19h 10m
1 stop
LHR16:40London Heathrow
30 Apr
LHR19:30London Heathrow
24h 00m
1 stop
STL13:30Lambert-St Louis
£508
Find similar
Lufthansa
3 Dec
STL11:50Lambert-St Louis
12h 30m
1 stop
LHR06:20London Heathrow
7 Dec
LHR07:30London Heathrow
20h 10m
2 stops
STL21:40Lambert-St Louis
£511
Find similar
Lufthansa
3 Dec
STL18:42Lambert-St Louis
15h 08m
2 stops
LHR15:50London Heathrow
8 Dec
LHR08:30London Heathrow
38h 33m
2 stops
STL17:03Lambert-St Louis
£514
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 25 November 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

Fri 5/12

11:50-08:25

1 stop14h 35m

London Heathrow

Thu 11/12

16:00-23:42

1 stop13h 42m

£500

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 10/5

22:00-12:05

Nonstop8h 05m

London Heathrow

Fri 22/5

14:25-22:34

1 stop14h 09m

£502

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Thu 8/1

15:43-06:00

2 stops32h 17m

London Gatwick

Fri 16/1

14:00-22:34

1 stop14h 34m

£502

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Mon 8/12

12:49-08:10

2 stops13h 21m

London City

Wed 24/12

08:40-22:16

2 stops19h 36m

£504

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 6/1

16:05-08:30

1 stop10h 25m

London Heathrow

Wed 14/1

13:00-15:29

1 stop32h 29m

£504

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/1

17:59-11:05

1 stop11h 06m

London Heathrow

Thu 15/1

10:25-17:43

1 stop13h 18m

£505

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/4

19:03-12:30

1 stop11h 27m

London Heathrow

Thu 16/4

11:00-19:03

1 stop14h 03m

£505

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Wed 7/1

17:11-10:00

1 stop34h 49m

London Gatwick

Sun 11/1

14:10-08:05

1 stop23h 55m

£505

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 6/1

11:22-21:20

1 stop27h 58m

London Heathrow

Fri 16/1

16:00-23:59

1 stop13h 59m

£506

St. LouisLondon

STL - LCY

STLLCY

Lambert-St Louis

Fri 6/2

09:59-08:10

2 stops16h 11m

London City

Tue 10/2

09:20-20:43

2 stops17h 23m

£548

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 November. Flight prices, which tend to average around £543, 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 £553.

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

Our data shows that Saturday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £646. 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 £967.

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 evening when flights can be purchased for as low as £456. Flights at midday are often more expensive, with an average ticket price of £933.

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 £687 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 £610 on momondo.

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

As of November 2025, prices for St. Louis to London flights are approximately 1% 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

Best price found

£455

Fastest flight time

8h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in London

1 airport
The best flight deal from St. Louis to London found on momondo in the last 72 hours is £455
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. A reasonable flight in good conditions will take 8h 05m.

  • 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 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
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom £442Free CancellationRating
6.7
7,536 reviews
Search British Airways flights
Air CanadaPriceFrom £446Free CancellationRating
7.1
10,469 reviews
Search Air Canada flights
Virgin AtlanticPriceFrom £482Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
KLMPriceFrom £516Free CancellationRating
7.7
1,420 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
Gatwick
Maidstone
Slough
Canterbury
Southend-on-Sea
Ipswich
Ilford
Guildford
Dover
Colchester
Chelmsford
Hayes
Worthing
Ramsgate
Dartford
Bedford
Winchester

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