Cheap flights from London to St. Louis from £318

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to St. Louis departing on 3/9. 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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Find the cheapest flights from London to St. Louis

Cheap return flights

 Logo
14:00 - 10:50LGW-STL
26h 50m2 stops
 Logo
13:52 - 10:10STL-LGW
14h 18m1 stop
Wed, 24 Sep - Sun, 28 Sep
 Logo
14:00 - 13:02LGW-STL
29h 02m1 stop
 Logo
19:55 - 09:30STL-LGW
31h 35m2 stops
Sun, 14 Sep - Sun, 21 Sep
 Logo
14:00 - 10:50LGW-STL
26h 50m2 stops
 Logo
12:05 - 20:25STL-LGW
26h 20m3 stops
Sat, 13 Sep - Thu, 25 Sep
Lufthansa Logo
06:30 - 18:33LHR-STL
18h 03m2 stops
Lufthansa Logo
13:00 - 06:40STL-LHR
11h 40m1 stop
£705Lufthansa
Find Deal
Tue, 13 Jan - Fri, 23 Jan
Lufthansa Logo
08:45 - 23:57LCY-STL
21h 12m2 stops
Lufthansa Logo
17:28 - 16:25STL-LCY
16h 57m2 stops
£727Lufthansa
Find Deal
Tue, 7 Oct - Tue, 14 Oct
British Airways Logo
20:25 - 21:06LCY-STL
30h 41m2 stops
British Airways Logo
10:36 - 16:30STL-LCY
23h 54m2 stops
£744British Airways
Find Deal
Mon, 29 Sep - Wed, 8 Oct
Finnair Logo
20:10 - 13:12LHR-STL
23h 02m2 stops
Finnair Logo
18:55 - 21:40STL-LHR
20h 45m2 stops
£764Finnair
Find Deal
Fri, 29 Aug - Fri, 12 Sep
British Airways Logo
17:05 - 20:15LCY-STL
33h 10m2 stops
British Airways Logo
13:03 - 10:40STL-LCY
15h 37m2 stops
£788British Airways
Find Deal
Thu, 11 Sep - Thu, 18 Sep
Virgin Atlantic Logo
09:20 - 23:41LCY-STL
20h 21m2 stops
Virgin Atlantic Logo
10:45 - 07:15STL-LCY
14h 30m2 stops
£946Virgin Atlantic
Find Deal
Thu, 16 Oct - Tue, 21 Oct
Virgin Atlantic Logo
09:20 - 21:30LCY-STL
18h 10m2 stops
Virgin Atlantic Logo
10:45 - 08:50STL-LCY
16h 05m2 stops
£954Virgin Atlantic
Find Deal
Thu, 16 Oct - Tue, 21 Oct

Lufthansa flights from London to St. Louis

Our best Lufthansa deals on London to St. Louis flight tickets
Lufthansa
13 Jan
LHR06:30London Heathrow
18h 03m
2 stops
STL18:33Lambert-St Louis
23 Jan
STL13:00Lambert-St Louis
11h 40m
1 stop
LHR06:40London Heathrow
Lufthansa
7 Oct
LCY08:45London City
21h 12m
2 stops
STL23:57Lambert-St Louis
14 Oct
STL17:28Lambert-St Louis
16h 57m
2 stops
LCY16:25London City
Lufthansa
6 Oct
LCY19:10London City
34h 47m
2 stops
STL23:57Lambert-St Louis
13 Oct
STL12:25Lambert-St Louis
22h 00m
2 stops
LCY16:25London City

Air Canada flights from London to St. Louis

Our best Air Canada deals on London to St. Louis flight tickets
Air Canada
13 Sept
LHR14:05London Heathrow
11h 52m
1 stop
STL19:57Lambert-St Louis
27 Sept
STL13:30Lambert-St Louis
11h 00m
1 stop
LHR06:30London Heathrow
Air Canada
3 Sept
LHR14:05London Heathrow
11h 52m
1 stop
STL19:57Lambert-St Louis
24 Sept
STL09:15Lambert-St Louis
15h 15m
2 stops
LHR06:30London Heathrow
Air Canada
30 Aug
LHR14:05London Heathrow
11h 55m
1 stop
STL20:00Lambert-St Louis
13 Sept
STL16:05Lambert-St Louis
13h 45m
1 stop
LHR11:50London Heathrow

momondo Fare Finder

 
Customise your flight search to find flights from London to St. Louis 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 31 July 2025.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Wed 24/9

14:00-10:50

2 stops26h 50m

Lambert-St Louis

Sun 28/9

13:52-10:10

1 stop14h 18m

£452

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Sun 14/9

14:00-13:02

1 stop29h 02m

Lambert-St Louis

Sun 21/9

19:55-09:30

2 stops31h 35m

£469

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Sat 13/9

14:00-10:50

2 stops26h 50m

Lambert-St Louis

Thu 25/9

12:05-20:25

3 stops26h 20m

£499

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

06:30-18:33

2 stops18h 03m

Lambert-St Louis

Fri 23/1

13:00-06:40

1 stop11h 40m

£705

LondonSt. Louis

LCY - STL

LCYSTL

London City

Tue 7/10

08:45-23:57

2 stops21h 12m

Lambert-St Louis

Tue 14/10

17:28-16:25

2 stops16h 57m

£727

LondonSt. Louis

LCY - STL

LCYSTL

London City

Mon 29/9

20:25-21:06

2 stops30h 41m

Lambert-St Louis

Wed 8/10

10:36-16:30

2 stops23h 54m

£744

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 29/8

20:10-13:12

2 stops23h 02m

Lambert-St Louis

Fri 12/9

18:55-21:40

2 stops20h 45m

£764

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 11/9

17:05-20:15

2 stops33h 10m

Lambert-St Louis

Thu 18/9

13:03-10:40

2 stops15h 37m

£788

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 16/10

09:20-23:41

2 stops20h 21m

Lambert-St Louis

Tue 21/10

10:45-07:15

2 stops14h 30m

£946

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 16/10

09:20-21:30

2 stops18h 10m

Lambert-St Louis

Tue 21/10

10:45-08:50

2 stops16h 05m

£954

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 St. Louis from

How to get the cheapest flight ticket from London to St. Louis

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 St. Louis?

The month of March is, on average, the cheapest month to fly to St. Louis from London, with most prices found around £557. If you’re not able to fly to St. Louis in March, then January is your next best option. Flight prices from London to St. Louis during January average around £565.

What is the cheapest day to depart on your flight to St. Louis?

Our data shows that Wednesday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £606. Flights from London to St. Louis on a Sunday will generally be more expensive and average around £722. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to St. Louis?

Our data shows that the cheapest London to St. Louis flights are usually those with departure times in the evening. Our users have found flights to St. Louis in the evening for as low as £565. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £664.

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from London when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around £729 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London for as low as £657 on momondo.

Can stopping save me money on London to St. Louis flights?

You could potentially save up to 8% on your flight if you consider stops on a London to St. Louis flight.

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

As of July 2025, prices for London to St. Louis flights are approximately 36% more expensive when compared to flights at the same time last year.

When to book flights from London to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from London to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap London to St. Louis (LON to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to St. Louis

Best price found

£318

Fastest flight time

11h 38m

Direct flights

None

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from London in the past 72 hours is £318. The best return flight deal from London to St. Louis found on momondo in the last 72 hours is £452.
The fastest flight from London to St. Louis takes 11h 38m
There are no direct flights from London to St. Louis. Popular non-direct routes for this connection are London Heathrow Airport - Lambert-St Louis Airport, London Gatwick Airport - Lambert-St Louis Airport and London Stansted Airport - Lambert-St Louis Airport.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • How far is London to Lambert-St Louis by plane?

    The distance between London and Lambert-St Louis is about 4197.7 mi. Flights usually cover this in 11h 52m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from London to Lambert-St Louis Airport?

    Prices for flights from London to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from London to Lambert-St Louis Airport?

  • How old do you have to be to fly from London to Lambert-St Louis Airport?

    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 London to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from London to St. Louis?


Best airlines flying from London to St. Louis

Compare and see reviews for airlines that fly from London to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom £175Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Scandinavian AirlinesPriceFrom £483Free CancellationRating
7.3
1,453 reviews
Search Scandinavian Airlines flights
FinnairPriceFrom £514Free CancellationRating
7.6
1,316 reviews
Search Finnair flights
Air CanadaPriceFrom £627Free CancellationRating
7.1
9,837 reviews
Search Air Canada flights
IberiaPriceFrom £631Free CancellationRating
7.0
2,859 reviews
Search Iberia flights
British AirwaysPriceFrom £634Free CancellationRating
6.6
7,217 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £640Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
United AirlinesPriceFrom £645Free CancellationRating
7.4
8,896 reviews
Search United Airlines flights
LufthansaPriceFrom £683Free CancellationRating
6.8
7,269 reviews
Search Lufthansa flights
KLMPriceFrom £723Free CancellationRating
7.8
1,383 reviews
Search KLM flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Collinsville

Why use momondo?

Why should I use momondo to find a flight deal from London to St. Louis?

Finding the right flight to St. Louis from London is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

Can I find flights from London to St. Louis with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for London to St. Louis flights to just show those with flexible booking policies.

How can momondo help me find flights from London to St. Louis?

Once you have performed a search for London to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?

If you are not ready to book a flight from London to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.


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