Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from London to St. Louis from $363

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 8/27. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from London to St. Louis

Cheap round-trip flights

 Logo
2:00 pm - 2:21 pmLGW-STL
30h 21m1 stop
 Logo
7:55 pm - 10:55 amSTL-LGW
33h 00m2 stops
Sun, Aug 24 - Tue, Sep 9
 Logo
2:00 pm - 1:35 pmLGW-STL
29h 35m2 stops
 Logo
9:15 am - 7:40 pmSTL-LGW
28h 25m3 stops
Sat, Sep 20 - Wed, Oct 8
United Airlines Logo
3:20 pm - 11:35 pmLHR-STL
14h 15m1 stop
United Airlines Logo
6:00 am - 6:30 amSTL-LHR
18h 30m2 stops
$821United Airlines
Find Deal
Wed, Aug 13 - Wed, Sep 3
United Airlines Logo
3:20 pm - 11:35 pmLHR-STL
14h 15m1 stop
United Airlines Logo
6:00 am - 6:45 amSTL-LHR
18h 45m1 stop
$828United Airlines
Find Deal
Wed, Aug 13 - Wed, Sep 3
Scandinavian Airlines Logo
6:40 am - 11:39 pmLHR-STL
22h 59m2 stops
Scandinavian Airlines Logo
1:30 pm - 6:30 pmSTL-LHR
23h 00m2 stops
$845Scandinavian Airlines
Find Deal
Thu, Oct 16 - Tue, Oct 21
Scandinavian Airlines Logo
6:40 am - 11:39 pmLHR-STL
22h 59m2 stops
Scandinavian Airlines Logo
3:30 pm - 6:30 pmSTL-LHR
21h 00m2 stops
$884Scandinavian Airlines
Find Deal
Thu, Oct 16 - Tue, Oct 21
Lufthansa Logo
9:30 am - 7:57 pmLHR-STL
16h 27m1 stop
Lufthansa Logo
5:22 pm - 10:10 amSTL-LHR
10h 48m1 stop
$936Lufthansa
Find Deal
Mon, Sep 8 - Fri, Sep 19
Lufthansa Logo
9:30 am - 7:57 pmLHR-STL
16h 27m1 stop
Lufthansa Logo
1:39 pm - 9:40 amSTL-LHR
14h 01m1 stop
$938Lufthansa
Find Deal
Mon, Sep 8 - Fri, Sep 19
British Airways Logo
2:10 pm - 8:00 pmLHR-STL
11h 50m1 stop
British Airways Logo
5:57 pm - 11:40 amSTL-LHR
11h 43m1 stop
$959British Airways
Find Deal
Tue, Nov 25 - Mon, Dec 1
British Airways Logo
7:00 am - 8:24 pmLCY-STL
19h 24m2 stops
British Airways Logo
1:15 pm - 12:10 pmSTL-LCY
16h 55m2 stops
$1,721British Airways
Find Deal
Thu, Jul 24 - Sun, Aug 10

Scandinavian Airlines flights from London to St. Louis

Our best Scandinavian Airlines deals on London to St. Louis flight tickets
Scandinavian Airlines
Oct 16
LHR6:40 amLondon Heathrow
22h 59m
2 stops
STL11:39 pmLambert-St Louis
Oct 21
STL1:30 pmLambert-St Louis
23h 00m
2 stops
LHR6:30 pmLondon Heathrow
Scandinavian Airlines
Oct 16
LHR6:40 amLondon Heathrow
22h 59m
2 stops
STL11:39 pmLambert-St Louis
Oct 21
STL3:30 pmLambert-St Louis
21h 00m
2 stops
LHR6:30 pmLondon Heathrow
Scandinavian Airlines
Aug 13
LHR6:40 amLondon Heathrow
21h 22m
2 stops
STL10:02 pmLambert-St Louis
Sep 3
STL3:36 pmLambert-St Louis
20h 04m
2 stops
LHR5:40 pmLondon Heathrow

Lufthansa flights from London to St. Louis

Our best Lufthansa deals on London to St. Louis flight tickets
Lufthansa
Sep 8
LHR9:30 amLondon Heathrow
16h 27m
1 stop
STL7:57 pmLambert-St Louis
Sep 19
STL5:22 pmLambert-St Louis
10h 48m
1 stop
LHR10:10 amLondon Heathrow
Lufthansa
Sep 8
LHR9:30 amLondon Heathrow
16h 27m
1 stop
STL7:57 pmLambert-St Louis
Sep 19
STL1:39 pmLambert-St Louis
14h 01m
1 stop
LHR9:40 amLondon Heathrow
Lufthansa
Sep 8
LHR5:40 pmLondon Heathrow
26h 39m
2 stops
STL2:19 pmLambert-St Louis
Sep 19
STL5:22 pmLambert-St Louis
10h 48m
1 stop
LHR10:10 amLondon 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 $740. 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 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $954 when searching 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 $827 on momondo.

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

You could potentially save up to 23% 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 33% 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

$363

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 $363. The best round-trip flight deal from London to St. Louis found on momondo in the last 72 hours is $705.
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?

    Lambert-St Louis is 4197.7 mi away from London. By plane, this route typically takes 11h 38m.

  • 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
British AirwaysPriceFrom $555Free CancellationRating
6.6
7,089 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,208 reviews
Search Lufthansa flights
United AirlinesPriceFrom $952Free CancellationRating
7.4
8,858 reviews
Search United Airlines 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
Hermann
Fairview Heights
Florissant
Maryland Heights
Collinsville
Fenton
Farmington
O'Fallon
St. Peters
Alton
Wentzville
Glencoe
Festus
Clayton
Eureka
Edwardsville
Grafton
Shrewsbury

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.


An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 7/7
Mon 7/14

Find better results for your trip to the United States