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Cheap flights from London to St. Louis from $451

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 6/4. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from London to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
Multiple Airlines Logo
3:33 pm - 12:50 pm
STL
-
LHR
15h 17m
1 stop
$820Multiple Airlines
週三, 9月 9 - 週三, 9月 16
Multiple Airlines Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
Multiple Airlines Logo
3:33 pm - 12:50 pm
STL
-
LHR
15h 17m
1 stop
$821Multiple Airlines
週三, 9月 9 - 週三, 9月 16
Multiple Airlines Logo
10:05 am - 7:46 pm
LHR
-
STL
15h 41m
1 stop
Multiple Airlines Logo
8:30 am - 6:20 am
STL
-
LHR
15h 50m
1 stop
$827Multiple Airlines
週三, 9月 9 - 週三, 9月 16
Multiple Airlines Logo
10:05 am - 7:46 pm
LHR
-
STL
15h 41m
1 stop
Multiple Airlines Logo
3:33 pm - 12:50 pm
STL
-
LHR
15h 17m
1 stop
$828Multiple Airlines
週三, 9月 9 - 週三, 9月 16
KLM Logo
11:45 am - 11:37 pm
LHR
-
STL
17h 52m
2 stops
KLM Logo
2:18 pm - 7:10 am
STL
-
LHR
10h 52m
1 stop
$834KLM
週二, 9月 8 - 週二, 9月 15
American Airlines Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
American Airlines Logo
6:55 pm - 6:55 pm
STL
-
LHR
18h 00m
1 stop
$836American Airlines
週三, 9月 9 - 週日, 9月 13
American Airlines Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
American Airlines Logo
4:29 pm - 10:50 am
STL
-
LHR
12h 21m
1 stop
$837American Airlines
週三, 9月 9 - 週一, 9月 14
Air France Logo
10:35 am - 9:19 pm
LGW
-
STL
16h 44m
2 stops
Air France Logo
11:25 am - 4:00 pm
STL
-
LGW
22h 35m
2 stops
$1,020Air France
週二, 4月 28 - 週六, 5月 9
Delta Logo
10:35 am - 11:36 pm
LGW
-
STL
19h 01m
2 stops
Delta Logo
4:13 pm - 4:00 pm
STL
-
LGW
17h 47m
2 stops
$1,057Delta
週二, 4月 28 - 週四, 6月 11
Delta Logo
10:00 am - 8:37 pm
LCY
-
STL
16h 37m
2 stops
Delta Logo
1:22 pm - 9:30 am
STL
-
LCY
14h 08m
2 stops
$1,062Delta
週三, 7月 8 - 週二, 7月 14

KLM flights from London to St. Louis

Our best KLM deals on London to St. Louis flight tickets
KLM
Sep 8
LHR11:45 amLondon Heathrow
17h 52m
2 stops
STL11:37 pmLambert-St Louis
Sep 15
STL2:18 pmLambert-St Louis
10h 52m
1 stop
LHR7:10 amLondon Heathrow
$834
KLM
May 7
LHR11:45 amLondon Heathrow
18h 14m
2 stops
STL11:59 pmLambert-St Louis
May 12
STL6:57 pmLambert-St Louis
12h 18m
1 stop
LHR1:15 pmLondon Heathrow
$873
KLM
Apr 20
LHR3:15 pmLondon Heathrow
14h 21m
1 stop
STL11:36 pmLambert-St Louis
Apr 30
STL11:42 amLambert-St Louis
13h 03m
2 stops
LHR6:45 amLondon Heathrow
$1,097

American Airlines flights from London to St. Louis

Our best American Airlines deals on London to St. Louis flight tickets
American Airlines
Sep 9
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 15
STL12:47 pmLambert-St Louis
12h 08m
1 stop
LHR6:55 amLondon Heathrow
$836
American Airlines
Sep 9
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 17
STL9:46 amLambert-St Louis
16h 14m
1 stop
LHR8:00 amLondon Heathrow
$837
American Airlines
Sep 9
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 16
STL9:46 amLambert-St Louis
15h 24m
1 stop
LHR7:10 amLondon Heathrow
$838

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 4月 9, 2026.
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

Cheapest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週三 9/9

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

週三 9/16

3:33 pm-12:50 pm

1 stop15h 17m

$820

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週三 9/9

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

週三 9/16

3:33 pm-12:50 pm

1 stop15h 17m

$821

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週三 9/9

10:05 am-7:46 pm

1 stop15h 41m

Lambert-St Louis

週三 9/16

8:30 am-6:20 am

1 stop15h 50m

$827

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週三 9/9

10:05 am-7:46 pm

1 stop15h 41m

Lambert-St Louis

週三 9/16

3:33 pm-12:50 pm

1 stop15h 17m

$828

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週二 9/8

11:45 am-11:37 pm

2 stops17h 52m

Lambert-St Louis

週二 9/15

2:18 pm-7:10 am

1 stop10h 52m

$834

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週三 9/9

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

週日 9/13

6:55 pm-6:55 pm

1 stop18h 00m

$836
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

週三 9/9

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

週一 9/14

4:29 pm-10:50 am

1 stop12h 21m

$837

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

週二 4/28

10:35 am-9:19 pm

2 stops16h 44m

Lambert-St Louis

週六 5/9

11:25 am-4:00 pm

2 stops22h 35m

$1,020

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

週二 4/28

10:35 am-11:36 pm

2 stops19h 01m

Lambert-St Louis

週四 6/11

4:13 pm-4:00 pm

2 stops17h 47m

$1,057

LondonSt. Louis

LCY - STL

LCYSTL

London City

週三 7/8

10:00 am-8:37 pm

2 stops16h 37m

Lambert-St Louis

週二 7/14

1:22 pm-9:30 am

2 stops14h 08m

$1,062

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, February 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 $896. The month of March is another great option to travel to St. Louis, with average flight prices from London averaging around $909.

What is the cheapest London to Lambert-St Louis flight route?

Fly from London Heathrow to Lambert-St Louis for the best London - Lambert-St Louis flight prices

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 $987 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 $869 on momondo.

What cabin class options are available on London to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on London to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

You could potentially save up to 16% 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 April 2026, prices for London to St. Louis flights are approximately 32% cheaper 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

$679

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from London in the past 72 hours is $679. The best round-trip flight deal from London to St. Louis found on momondo in the last 72 hours is $1,017.
The fastest flight from London to St. Louis takes 9h 05m
Direct flights go from London to St. Louis on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights.
There is 1 airport in St. Louis. From London there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from London to St. Louis

  • 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 9h 05m.

  • 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 plane model 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
7,863 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,554 reviews
Search United Airlines flights
American AirlinesPriceFrom $692Free CancellationRating
7.1
11,559 reviews
Search American 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
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Wentzville
Alton
Fenton
Farmington
Clayton
Festus
Eureka
Edwardsville
Litchfield
Shrewsbury
Grafton

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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