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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 9/4. 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
16:57 - 10:10STL-LGW
35h 13m1 stop
 Logo
14:00 - 23:46LGW-STL
15h 46m1 stop
Sat, 12 Apr - Mon, 21 Apr
 Logo
16:57 - 10:00STL-LGW
35h 03m1 stop
 Logo
14:00 - 00:04LGW-STL
16h 04m1 stop
Fri, 11 Apr - Fri, 25 Apr
Air Canada Logo
15:30 - 08:35STL-LHR
11h 05m1 stop
Air Canada Logo
14:05 - 19:58LHR-STL
11h 53m1 stop
£512Air Canada
Find Deal
Tue, 29 Apr - Tue, 6 May
Finnair Logo
18:00 - 10:30STL-LHR
10h 30m1 stop
Finnair Logo
10:20 - 21:52LHR-STL
17h 32m2 stops
£517Finnair
Find Deal
Tue, 29 Apr - Tue, 6 May
Finnair Logo
14:01 - 12:30STL-LHR
16h 29m1 stop
Finnair Logo
18:10 - 18:21LHR-STL
30h 11m2 stops
£526Finnair
Find Deal
Tue, 9 Sep - Mon, 22 Sep
British Airways Logo
19:30 - 12:15STL-LHR
10h 45m1 stop
British Airways Logo
19:30 - 18:21LHR-STL
28h 51m2 stops
£542British Airways
Find Deal
Sun, 11 May - Mon, 19 May
British Airways Logo
12:07 - 06:25STL-LHR
12h 18m1 stop
British Airways Logo
20:40 - 20:21LHR-STL
29h 41m2 stops
£549British Airways
Find Deal
Wed, 17 Sep - Mon, 29 Sep
Virgin Atlantic Logo
17:32 - 13:30STL-LHR
13h 58m1 stop
Virgin Atlantic Logo
11:45 - 21:36LHR-STL
15h 51m1 stop
£563Virgin Atlantic
Find Deal
Tue, 29 Apr - Tue, 6 May
Air Canada Logo
13:30 - 06:30STL-LHR
11h 00m1 stop
Air Canada Logo
06:50 - 19:57LHR-STL
19h 07m2 stops
£585Air Canada
Find Deal
Wed, 24 Sep - Wed, 1 Oct
Virgin Atlantic Logo
10:45 - 06:45STL-LHR
14h 00m2 stops
Virgin Atlantic Logo
15:15 - 23:38LHR-STL
14h 23m1 stop
£623Virgin Atlantic
Find Deal
Mon, 12 May - Sat, 24 May

Air Canada flights from St. Louis to London

Our best Air Canada deals on St. Louis to London flight tickets
Air Canada
29 Apr
STL15:30Lambert-St Louis
11h 05m
1 stop
LHR08:35London Heathrow
6 May
LHR14:05London Heathrow
11h 53m
1 stop
STL19:58Lambert-St Louis
Air Canada
24 Sept
STL13:30Lambert-St Louis
11h 00m
1 stop
LHR06:30London Heathrow
1 Oct
LHR06:50London Heathrow
19h 07m
2 stops
STL19:57Lambert-St Louis
Air Canada
19 May
STL07:30Lambert-St Louis
17h 00m
2 stops
LHR06:30London Heathrow
2 Jun
LHR11:05London Heathrow
38h 53m
2 stops
STL19:58Lambert-St Louis

Finnair flights from St. Louis to London

Our best Finnair deals on St. Louis to London flight tickets
Finnair
29 Apr
STL18:00Lambert-St Louis
10h 30m
1 stop
LHR10:30London Heathrow
6 May
LHR10:20London Heathrow
17h 32m
2 stops
STL21:52Lambert-St Louis
Finnair
9 Sept
STL14:01Lambert-St Louis
16h 29m
1 stop
LHR12:30London Heathrow
22 Sept
LHR18:10London Heathrow
30h 11m
2 stops
STL18:21Lambert-St Louis
Finnair
2 Apr
STL18:29Lambert-St Louis
10h 01m
1 stop
LHR10:30London Heathrow
9 Apr
LHR12:15London Heathrow
15h 57m
1 stop
STL22:12Lambert-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 £581, 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 £608.

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 £595. 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 £981.

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 £630. Flights in the evening are often more expensive, with an average ticket price of £1,128.

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 £736 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 £611 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 8% 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

9h 51m

Direct flights

None

Airports in London

5 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 £453.
The fastest flight from St. Louis to London takes 9h 51m
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 Stansted Airport and Lambert-St Louis Airport - London Heathrow Airport.
There are 5 airports near London: London City (LCY), London Heathrow (LHR), London Luton (LTN), London Stansted (STN), London Gatwick (LGW)

  • 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 9h 51m.

  • 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
British AirwaysPriceFrom £519Free CancellationRating
6.6
6,715 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £544Free CancellationRating
7.4
636 reviews
Search Virgin Atlantic flights
KLMPriceFrom £551Free CancellationRating
7.8
1,323 reviews
Search KLM flights
American AirlinesPriceFrom £608Free 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
Ipswich
Maidstone
Canterbury
Margate
Dartford
Hounslow
Ilford
Colchester
Guildford
Winchester
Worthing
Croydon
Chichester
Crawley

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