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Cheap flights from St. Louis to London from £264

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 28/6. 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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Find the cheapest flights from St. Louis to London

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
20:21 - 10:00
STL
-
LGW
55h 39m
2 stops
Multiple Airlines Logo
14:00 - 00:14
LGW
-
STL
16h 14m
1 stop
£590Multiple Airlines
Mon, 20 Jul - Fri, 28 Aug
Multiple Airlines Logo
16:10 - 10:00
STL
-
LGW
35h 50m
1 stop
Multiple Airlines Logo
14:00 - 00:14
LGW
-
STL
16h 14m
1 stop
£608Multiple Airlines
Mon, 20 Jul - Fri, 28 Aug
Scandinavian Airlines Logo
15:42 - 16:00
STL
-
LHR
18h 18m
2 stops
Scandinavian Airlines Logo
06:40 - 23:37
LHR
-
STL
22h 57m
2 stops
£609Scandinavian Airlines
Mon, 14 Sep - Mon, 21 Sep
Virgin Atlantic Logo
17:36 - 13:05
STL
-
LHR
13h 29m
1 stop
Virgin Atlantic Logo
08:40 - 23:21
LHR
-
STL
20h 41m
2 stops
£613Virgin Atlantic
Sun, 10 May - Tue, 19 May
Scandinavian Airlines Logo
15:42 - 18:30
STL
-
LHR
20h 48m
2 stops
Scandinavian Airlines Logo
06:40 - 20:50
LHR
-
STL
20h 10m
2 stops
£615Scandinavian Airlines
Mon, 14 Sep - Sat, 19 Sep
Scandinavian Airlines Logo
15:42 - 16:00
STL
-
LHR
18h 18m
2 stops
Scandinavian Airlines Logo
06:40 - 23:37
LHR
-
STL
22h 57m
3 stops
£618Scandinavian Airlines
Mon, 14 Sep - Mon, 21 Sep
Scandinavian Airlines Logo
13:30 - 17:40
STL
-
LHR
22h 10m
2 stops
Scandinavian Airlines Logo
21:05 - 20:50
LHR
-
STL
29h 45m
3 stops
£618Scandinavian Airlines
Sun, 6 Sep - Fri, 18 Sep
Air Canada Logo
12:10 - 08:35
STL
-
LHR
14h 25m
2 stops
Air Canada Logo
17:15 - 18:42
LHR
-
STL
31h 27m
2 stops
£622Air Canada
Wed, 26 Aug - Wed, 2 Sep
Air Canada Logo
12:10 - 06:30
STL
-
LHR
12h 20m
1 stop
Air Canada Logo
08:40 - 18:42
LHR
-
STL
16h 02m
2 stops
£625Air Canada
Wed, 26 Aug - Wed, 2 Sep
American Airlines Logo
07:32 - 06:55
STL
-
LGW
17h 23m
2 stops
American Airlines Logo
12:20 - 23:31
LGW
-
STL
17h 11m
2 stops
£637American Airlines
Sun, 27 Sep - Tue, 6 Oct

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Scandinavian Airlines flights from St. Louis to London

Our best Scandinavian Airlines deals on St. Louis to London flight tickets
Scandinavian Airlines
14 Sept
STL15:42Lambert-St Louis
18h 18m
2 stops
LHR16:00London Heathrow
21 Sept
LHR06:40London Heathrow
22h 57m
2 stops
STL23:37Lambert-St Louis
£609
Scandinavian Airlines
14 Sept
STL15:42Lambert-St Louis
20h 48m
2 stops
LHR18:30London Heathrow
19 Sept
LHR06:40London Heathrow
20h 10m
2 stops
STL20:50Lambert-St Louis
£615
Scandinavian Airlines
14 Sept
STL15:42Lambert-St Louis
18h 18m
2 stops
LHR16:00London Heathrow
21 Sept
LHR06:40London Heathrow
22h 57m
3 stops
STL23:37Lambert-St Louis
£618

United Airlines flights from St. Louis to London

Our best United Airlines deals on St. Louis to London flight tickets
United Airlines
12 May
STL13:05Lambert-St Louis
14h 55m
1 stop
LHR10:00London Heathrow
19 May
LHR06:50London Heathrow
15h 49m
2 stops
STL16:39Lambert-St Louis
£644
United Airlines
28 Apr
STL11:15Lambert-St Louis
18h 40m
1 stop
LHR11:55London Heathrow
6 May
LHR06:50London Heathrow
15h 49m
2 stops
STL16:39Lambert-St Louis
£646
United Airlines
5 May
STL16:06Lambert-St Louis
35h 34m
1 stop
LHR09:40London Heathrow
19 May
LHR17:40London Heathrow
24h 26m
1 stop
STL12:06Lambert-St Louis
£656

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 17 April 2026.
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

Cheapest return flight

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 20/7

20:21-10:00

2 stops55h 39m

London Gatwick

Fri 28/8

14:00-00:14

1 stop16h 14m

£590

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Mon 20/7

16:10-10:00

1 stop35h 50m

London Gatwick

Fri 28/8

14:00-00:14

1 stop16h 14m

£608

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 14/9

15:42-16:00

2 stops18h 18m

London Heathrow

Mon 21/9

06:40-23:37

2 stops22h 57m

£609

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 10/5

17:36-13:05

1 stop13h 29m

London Heathrow

Tue 19/5

08:40-23:21

2 stops20h 41m

£613

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 14/9

15:42-18:30

2 stops20h 48m

London Heathrow

Sat 19/9

06:40-20:50

2 stops20h 10m

£615

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 14/9

15:42-16:00

2 stops18h 18m

London Heathrow

Mon 21/9

06:40-23:37

3 stops22h 57m

£618

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 6/9

13:30-17:40

2 stops22h 10m

London Heathrow

Fri 18/9

21:05-20:50

3 stops29h 45m

£618

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 26/8

12:10-08:35

2 stops14h 25m

London Heathrow

Wed 2/9

17:15-18:42

2 stops31h 27m

£622
Fastest return journey

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 26/8

12:10-06:30

1 stop12h 20m

London Heathrow

Wed 2/9

08:40-18:42

2 stops16h 02m

£625

St. LouisLondon

STL - LGW

STLLGW

Lambert-St Louis

Sun 27/9

07:32-06:55

2 stops17h 23m

London Gatwick

Tue 6/10

12:20-23:31

2 stops17h 11m

£637

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 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 £496, 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 £503.

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

Our data shows that Friday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £470. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to London for around £893.

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 £625 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 £517 on momondo.

What cabin class options are available on Lambert-St Louis to London flights?

There is only 1 cabin class 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.

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

As of April 2026, prices for St. Louis to London flights are approximately 42% 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

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. 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?

  • 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
Virgin AtlanticPriceFrom £405Free CancellationRating
7.5
687 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £428Free CancellationRating
6.7
7,889 reviews
Search British Airways 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
Slough
Maidstone
Wembley
Southend-on-Sea
Ipswich
Canterbury
Ilford
Guildford
Hayes
Dover
Chelmsford
Folkestone
Bedford
Ramsgate
Chichester
Harlow

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