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Cheap flights from London to St. Louis from $397

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 10/6. 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

Scandinavian Airlines Logo
6:40 am - 9:58 pmLHR-STL
21h 18m2 stops
Scandinavian Airlines Logo
1:55 pm - 6:30 pmSTL-LHR
22h 35m2 stops
$805Scandinavian Airlines
Find Deal
lun., nov. 24 - lun., dic. 1
Scandinavian Airlines Logo
7:05 am - 11:40 pmLHR-STL
22h 35m3 stops
Scandinavian Airlines Logo
11:40 am - 4:00 pmSTL-LHR
22h 20m2 stops
$809Scandinavian Airlines
Find Deal
jue., nov. 20 - lun., dic. 8
Lufthansa Logo
6:30 am - 2:55 pmLHR-STL
13h 25m1 stop
Lufthansa Logo
12:31 pm - 5:55 amSTL-LHR
11h 24m1 stop
$847Lufthansa
Find Deal
mié., oct. 29 - mié., nov. 5
Lufthansa Logo
6:30 am - 2:55 pmLHR-STL
13h 25m1 stop
Lufthansa Logo
11:05 am - 5:55 amSTL-LHR
12h 50m1 stop
$849Lufthansa
Find Deal
vie., oct. 31 - vie., nov. 7
Multiple Airlines Logo
6:50 am - 7:57 pmLHR-STL
19h 07m2 stops
Multiple Airlines Logo
11:39 am - 5:55 amSTL-LHR
12h 16m1 stop
$853Multiple Airlines
Find Deal
mar., oct. 7 - mié., oct. 22
United Airlines Logo
6:30 am - 2:55 pmLHR-STL
13h 25m1 stop
United Airlines Logo
1:35 pm - 9:40 amSTL-LHR
14h 05m1 stop
$871United Airlines
Find Deal
mié., oct. 29 - mié., nov. 5
United Airlines Logo
9:00 am - 9:40 pmLHR-STL
18h 40m2 stops
United Airlines Logo
11:25 am - 6:40 amSTL-LHR
13h 15m2 stops
$872United Airlines
Find Deal
mié., nov. 19 - jue., dic. 4
Multiple Airlines Logo
6:50 am - 3:18 pmLHR-STL
14h 28m2 stops
Multiple Airlines Logo
1:30 pm - 6:30 amSTL-LHR
11h 00m1 stop
$878Multiple Airlines
Find Deal
jue., oct. 9 - mié., oct. 15
British Airways Logo
2:45 pm - 9:52 pmLHR-STL
13h 07m1 stop
British Airways Logo
1:55 pm - 8:35 amSTL-LHR
12h 40m1 stop
$945British Airways
Find Deal
dom., dic. 7 - jue., dic. 18
British Airways Logo
8:40 am - 9:00 pmLCY-STL
18h 20m2 stops
British Airways Logo
10:44 am - 1:50 pmSTL-LCY
21h 06m2 stops
$1,319British Airways
Find Deal
sáb., nov. 8 - sáb., nov. 22

Virgin Atlantic flights from London to St. Louis

Our best Virgin Atlantic deals on London to St. Louis flight tickets
Virgin Atlantic
Oct 7
LHR11:20 amLondon Heathrow
12h 42m
1 stop
STL6:02 pmLambert-St Louis
Oct 22
STL2:15 pmLambert-St Louis
14h 15m
2 stops
LHR10:30 amLondon Heathrow
$874
Find similar
Virgin Atlantic
Oct 7
LHR9:20 amLondon Heathrow
12h 35m
1 stop
STL3:55 pmLambert-St Louis
Oct 22
STL5:15 pmLambert-St Louis
11h 55m
1 stop
LHR11:10 amLondon Heathrow
$876
Find similar
Virgin Atlantic
Dec 7
LHR8:25 pmLondon Heathrow
27h 32m
2 stops
STL5:57 pmLambert-St Louis
Dec 18
STL1:55 pmLambert-St Louis
10h 30m
1 stop
LHR6:25 amLondon Heathrow
$901
Find similar

Air Canada flights from London to St. Louis

Our best Air Canada deals on London to St. Louis flight tickets
Air Canada
Nov 8
LHR6:00 pmLondon Heathrow
27h 29m
1 stop
STL3:29 pmLambert-St Louis
Nov 22
STL4:05 pmLambert-St Louis
13h 15m
1 stop
LHR11:20 amLondon Heathrow
$884
Find similar
Air Canada
Oct 9
LHR9:30 amLondon Heathrow
16h 27m
1 stop
STL7:57 pmLambert-St Louis
Oct 15
STL1:30 pmLambert-St Louis
11h 00m
1 stop
LHR6:30 amLondon Heathrow
$900
Find similar
Air Canada
Jan 1
LHR1:25 pmLondon Heathrow
32h 04m
2 stops
STL3:29 pmLambert-St Louis
Jan 29
STL4:05 pmLambert-St Louis
33h 05m
2 stops
LHR7:10 amLondon Heathrow
$913
Find similar

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated septiembre 16, 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

LHR - STL

LHRSTL

London Heathrow

lun. 11/24

6:40 am-9:58 pm

2 stops21h 18m

Lambert-St Louis

lun. 12/1

1:55 pm-6:30 pm

2 stops22h 35m

$805

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 11/20

7:05 am-11:40 pm

3 stops22h 35m

Lambert-St Louis

lun. 12/8

11:40 am-4:00 pm

2 stops22h 20m

$809

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

mié. 10/29

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

mié. 11/5

12:31 pm-5:55 am

1 stop11h 24m

$847

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

vie. 10/31

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

vie. 11/7

11:05 am-5:55 am

1 stop12h 50m

$849

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

mar. 10/7

6:50 am-7:57 pm

2 stops19h 07m

Lambert-St Louis

mié. 10/22

11:39 am-5:55 am

1 stop12h 16m

$853

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

mié. 10/29

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

mié. 11/5

1:35 pm-9:40 am

1 stop14h 05m

$871

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

mié. 11/19

9:00 am-9:40 pm

2 stops18h 40m

Lambert-St Louis

jue. 12/4

11:25 am-6:40 am

2 stops13h 15m

$872

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 10/9

6:50 am-3:18 pm

2 stops14h 28m

Lambert-St Louis

mié. 10/15

1:30 pm-6:30 am

1 stop11h 00m

$878

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

dom. 12/7

2:45 pm-9:52 pm

1 stop13h 07m

Lambert-St Louis

jue. 12/18

1:55 pm-8:35 am

1 stop12h 40m

$945

LondonSt. Louis

LCY - STL

LCYSTL

London City

sáb. 11/8

8:40 am-9:00 pm

2 stops18h 20m

Lambert-St Louis

sáb. 11/22

10:44 am-1:50 pm

2 stops21h 06m

$1,319

Flights are sorted by cheapest round-trip 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 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 $972 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 $880 on momondo.

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

You could potentially save up to 5% 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 September 2025, prices for London to St. Louis flights are approximately 13% 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

Direct flights

None
There are no direct flights from London to St. Louis. There are no popular flight routes from London to St. Louis.
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  • 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 12h 35m.

  • 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
6.7
7,363 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
United AirlinesPriceFrom $952Free CancellationRating
7.4
8,924 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
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
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

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