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Cheap flights from St. Louis to London from £191

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 7/7. 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

KAYAK's recommended return flight deals from the most popular airlines that fly from St. Louis to London.
 Logo
17:45 - 10:00STL-LGW
34h 15m1 stop
 Logo
14:00 - 00:14LGW-STL
16h 14m1 stop
Tue, 6 May - Fri, 9 May
 Logo
17:45 - 10:00STL-LGW
34h 15m1 stop
 Logo
14:00 - 23:44LGW-STL
15h 44m1 stop
Wed, 7 May - Wed, 21 May
Scandinavian Airlines Logo
13:30 - 17:40STL-LHR
22h 10m2 stops
Scandinavian Airlines Logo
06:40 - 23:39LHR-STL
22h 59m2 stops
£540Scandinavian Airlines
Find Deal
Wed, 20 Aug - Wed, 27 Aug
Scandinavian Airlines Logo
15:30 - 17:40STL-LHR
20h 10m2 stops
Scandinavian Airlines Logo
07:05 - 23:39LHR-STL
22h 34m3 stops
£552Scandinavian Airlines
Find Deal
Mon, 25 Aug - Thu, 4 Sep
Delta Logo
11:51 - 10:00STL-LGW
16h 09m2 stops
Delta Logo
12:00 - 23:39LGW-STL
17h 39m2 stops
£561Delta
Find Deal
Mon, 25 Aug - Thu, 4 Sep
British Airways Logo
16:52 - 10:30STL-LHR
11h 38m1 stop
British Airways Logo
09:15 - 16:22LHR-STL
13h 07m1 stop
£565British Airways
Find Deal
Wed, 20 Aug - Wed, 27 Aug
British Airways Logo
16:52 - 10:30STL-LHR
11h 38m1 stop
British Airways Logo
13:10 - 19:08LHR-STL
11h 58m1 stop
£566British Airways
Find Deal
Mon, 25 Aug - Thu, 4 Sep
Air Canada Logo
13:30 - 06:30STL-LHR
11h 00m1 stop
Air Canada Logo
14:05 - 15:44LHR-STL
31h 39m2 stops
£568Air Canada
Find Deal
Wed, 20 Aug - Wed, 27 Aug
Air Canada Logo
16:00 - 06:35STL-LHR
32h 35m1 stop
Air Canada Logo
06:50 - 19:57LHR-STL
19h 07m2 stops
£575Air Canada
Find Deal
Sun, 31 Aug - Tue, 16 Sep
Delta Logo
17:30 - 13:10STL-LHR
13h 40m1 stop
Delta Logo
08:40 - 20:30LHR-STL
17h 50m2 stops
£579Delta
Find Deal
Mon, 25 Aug - Thu, 4 Sep

Air Canada flights from St. Louis to London

Our best Air Canada deals on St. Louis to London flight tickets
Air Canada
20 Aug
STL13:30Lambert-St Louis
11h 00m
1 stop
LHR06:30London Heathrow
27 Aug
LHR14:05London Heathrow
31h 39m
2 stops
STL15:44Lambert-St Louis
Air Canada
31 Aug
STL16:00Lambert-St Louis
32h 35m
1 stop
LHR06:35London Heathrow
16 Sept
LHR06:50London Heathrow
19h 07m
2 stops
STL19:57Lambert-St Louis
Air Canada
22 Sept
STL13:30Lambert-St Louis
14h 05m
1 stop
LHR09:35London Heathrow
29 Sept
LHR06:50London Heathrow
19h 07m
2 stops
STL19:57Lambert-St Louis

Iberia flights from St. Louis to London

Our best Iberia deals on St. Louis to London flight tickets
Iberia
8 Aug
STL13:22Lambert-St Louis
11h 58m
1 stop
LHR07:20London Heathrow
15 Aug
LHR12:30London Heathrow
13h 53m
1 stop
STL20:23Lambert-St Louis
Iberia
9 Aug
STL13:22Lambert-St Louis
15h 28m
2 stops
LGW10:50London Gatwick
25 Aug
LGW20:40London Gatwick
29h 43m
2 stops
STL20:23Lambert-St Louis
Iberia
25 Sept
STL14:01Lambert-St Louis
12h 59m
1 stop
LHR09:00London Heathrow
29 Sept
LHR14:25London Heathrow
11h 58m
1 stop
STL20:23Lambert-St Louis

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 April. Flight prices, which tend to average around £578, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from St. Louis averaging around £587.

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 £575. 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 £948.

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 £609. Flights in the evening are often more expensive, with an average ticket price of £1,091.

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 9 weeks ahead of your departure date. In general, you can expect to find flights to London for around £716 when searching 9 weeks out.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 £602 on momondo.

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

As of April 2025, prices for St. Louis to London flights are approximately 7% 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

£191

Fastest flight time

10h 35m

Direct flights

None

Airports in London

6 airports
The best one-way flight to London from St. Louis in the past 72 hours is £191. The best return flight deal from St. Louis to London found on momondo in the last 72 hours is £447.
The fastest flight from St. Louis to London takes 10h 35m
There are no direct flights from St. Louis to London. Popular non-direct routes for this connection are Lambert-St Louis Airport - London City Airport, Lambert-St Louis Airport - London Gatwick 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)

  • 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 35m.

  • 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 £500Free CancellationRating
7.0
9,189 reviews
Search Air Canada flights
British AirwaysPriceFrom £502Free CancellationRating
6.6
6,798 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £526Free CancellationRating
7.4
642 reviews
Search Virgin Atlantic flights
KLMPriceFrom £533Free CancellationRating
7.8
1,333 reviews
Search KLM flights
American AirlinesPriceFrom £586Free CancellationRating
7.2
10,000 reviews
Search American Airlines 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
Southend-on-Sea
Gatwick
Maidstone
Ipswich
Canterbury
Margate
Dartford
Ilford
Hounslow
Colchester
Guildford
Worthing
Winchester
Crawley
Chichester
Croydon

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