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Cheap flights from London to St. Louis from $314

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 5/8. 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 round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from London to St. Louis.
 Logo
2:00 pm - 12:14 amLGW-STL
16h 14m1 stop
 Logo
5:55 pm - 10:00 amSTL-LGW
34h 05m1 stop
Fri, May 2 - Fri, May 9
 Logo
2:00 pm - 11:37 pmLGW-STL
15h 37m1 stop
 Logo
5:47 pm - 10:00 amSTL-LGW
34h 13m1 stop
Tue, Jun 10 - Fri, Jul 4
United Airlines Logo
8:00 am - 10:03 pmLHR-STL
20h 03m2 stops
United Airlines Logo
7:30 am - 6:30 amSTL-LHR
17h 00m2 stops
$808United Airlines
Find Deal
Tue, May 6 - Mon, May 19
United Airlines Logo
11:05 am - 9:56 amLHR-STL
28h 51m2 stops
United Airlines Logo
5:29 pm - 8:20 amSTL-LHR
32h 51m1 stop
$848United Airlines
Find Deal
Wed, May 14 - Wed, May 21
Iberia Logo
6:15 am - 8:23 pmLHR-STL
20h 08m2 stops
Iberia Logo
2:42 pm - 7:55 amSTL-LHR
11h 13m1 stop
$875Iberia
Find Deal
Wed, Sep 3 - Wed, Sep 24
Iberia Logo
3:30 pm - 11:49 pmLHR-STL
14h 19m1 stop
Iberia Logo
2:42 pm - 7:55 amSTL-LHR
11h 13m1 stop
$884Iberia
Find Deal
Wed, Sep 3 - Wed, Sep 24
British Airways Logo
12:30 pm - 8:58 pmLHR-STL
14h 28m1 stop
British Airways Logo
7:30 pm - 12:15 pmSTL-LHR
10h 45m1 stop
$898British Airways
Find Deal
Tue, May 6 - Mon, May 19
Air Canada Logo
8:40 am - 7:58 pmLHR-STL
17h 18m2 stops
Air Canada Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
$954Air Canada
Find Deal
Wed, May 7 - Tue, May 13
Air Canada Logo
9:30 am - 7:58 pmLHR-STL
16h 28m1 stop
Air Canada Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
$976Air Canada
Find Deal
Sat, May 3 - Sat, May 10
British Airways Logo
7:00 am - 8:21 pmLCY-STL
19h 21m2 stops
British Airways Logo
12:07 pm - 11:55 amSTL-LCY
17h 48m2 stops
$1,274British Airways
Find Deal
Tue, Sep 16 - Tue, Sep 23

Air Canada flights from London to St. Louis

Our best Air Canada deals on London to St. Louis flight tickets
Air Canada
May 7
LHR8:40 amLondon Heathrow
17h 18m
2 stops
STL7:58 pmLambert-St Louis
May 13
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
Air Canada
May 3
LHR9:30 amLondon Heathrow
16h 28m
1 stop
STL7:58 pmLambert-St Louis
May 10
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
Air Canada
Sep 8
LHR6:50 amLondon Heathrow
14h 28m
2 stops
STL3:18 pmLambert-St Louis
Sep 25
STL1:30 pmLambert-St Louis
14h 30m
1 stop
LHR10:00 amLondon Heathrow

Iberia flights from London to St. Louis

Our best Iberia deals on London to St. Louis flight tickets
Iberia
Sep 3
LHR6:15 amLondon Heathrow
20h 08m
2 stops
STL8:23 pmLambert-St Louis
Sep 24
STL2:42 pmLambert-St Louis
11h 13m
1 stop
LHR7:55 amLondon Heathrow
Iberia
Sep 3
LHR3:30 pmLondon Heathrow
14h 19m
1 stop
STL11:49 pmLambert-St Louis
Sep 24
STL2:42 pmLambert-St Louis
11h 13m
1 stop
LHR7:55 amLondon Heathrow
Iberia
May 1
LHR12:30 pmLondon Heathrow
14h 28m
1 stop
STL8:58 pmLambert-St Louis
May 8
STL7:30 pmLambert-St Louis
10h 45m
1 stop
LHR12:15 pmLondon Heathrow

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 typical price of a round-trip flight between London and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, March is the cheapest month to fly from London to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $739. The month of January is another great option to travel to St. Louis, with average flight prices from London averaging around $753.

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

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $952. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,371. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

Flying to St. Louis from London at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,075 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $1,229 per ticket.

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 4 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $929 when searching 4 weeks out.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 $821 on momondo.

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

As of April 2025, prices for London to St. Louis flights are approximately 26% 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 round-trip 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

$314

Fastest flight time

11h 52m

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 $314. The best round-trip flight deal from London to St. Louis found on momondo in the last 72 hours is $606.
The fastest flight from London to St. Louis takes 11h 52m
There are no direct flights from London to St. Louis. Popular non-direct routes for this connection are London Luton 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?

    Lambert-St Louis is 4197.7 mi away from London. By plane, this route typically takes 11h 52m.

  • 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 refreshed on a daily basis.

  • 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 travel and health documents you'll need for your trip to Lambert-St Louis Airport 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 Lambert-St Louis Airport. 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 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 $278Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $867Free CancellationRating
7.4
8,667 reviews
Search United Airlines flights
LufthansaPriceFrom $925Free CancellationRating
6.7
7,012 reviews
Search Lufthansa flights
British AirwaysPriceFrom $997Free CancellationRating
6.6
6,767 reviews
Search British Airways flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Florissant
Maryland Heights
Hermann
Fairview Heights
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Wentzville
Alton
Glencoe
Eureka
Edwardsville
Festus
Clayton
Grafton
Litchfield

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. All flights to St. Louis from London on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential London to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to St. Louis from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.


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