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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 6/1. 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.

Find the cheapest flights from London to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
10:45 am - 4:42 pm
LHR
-
STL
11h 57m
1 stop
Delta Logo
4:00 pm - 1:05 pm
STL
-
LHR
15h 05m
1 stop
$825Delta
Tue, May 5 - Sat, May 23
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$830British Airways
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
12:55 pm - 8:26 pm
LHR
-
STL
13h 31m
1 stop
British Airways Logo
12:47 pm - 6:55 am
STL
-
LHR
12h 08m
1 stop
$831British Airways
Wed, Sep 2 - Wed, Sep 23
Multiple Airlines Logo
10:05 am - 8:26 pm
LHR
-
STL
16h 21m
1 stop
Multiple Airlines Logo
8:07 pm - 12:15 pm
STL
-
LHR
10h 08m
1 stop
$836Multiple Airlines
Tue, Sep 8 - Tue, Sep 22
Finnair Logo
7:30 am - 11:51 pm
LHR
-
STL
22h 21m
2 stops
Finnair Logo
12:43 pm - 9:05 am
STL
-
LHR
14h 22m
1 stop
$845Finnair
Wed, Sep 2 - Wed, Sep 23
Finnair Logo
7:30 am - 11:51 pm
LHR
-
STL
22h 21m
2 stops
Finnair Logo
12:43 pm - 2:25 pm
STL
-
LHR
19h 42m
1 stop
$849Finnair
Wed, Sep 2 - Wed, Sep 23
American Airlines Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
American Airlines Logo
5:40 am - 6:20 am
STL
-
LHR
18h 40m
1 stop
$850American Airlines
Wed, Sep 9 - Mon, Sep 21
Multiple Airlines Logo
2:00 pm - 11:57 pm
LGW
-
STL
15h 57m
1 stop
Multiple Airlines Logo
6:31 pm - 10:00 am
STL
-
LGW
33h 29m
2 stops
$855Multiple Airlines
Thu, Jun 4 - Tue, Jun 16
Iberia Logo
11:30 am - 7:46 pm
LGW
-
STL
38h 16m
2 stops
Iberia Logo
11:18 am - 10:50 am
STL
-
LGW
17h 32m
2 stops
$951Iberia
Tue, Sep 8 - Tue, Sep 22
Iberia Logo
4:05 pm - 8:03 pm
LCY
-
STL
33h 58m
2 stops
Iberia Logo
8:07 pm - 9:10 am
STL
-
LCY
31h 03m
2 stops
$1,143Iberia
Fri, Sep 25 - Sun, Sep 27

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Finnair flights from London to St. Louis

Our best Finnair deals on London to St. Louis flight tickets
Finnair
Sep 2
LHR7:30 amLondon Heathrow
22h 21m
2 stops
STL11:51 pmLambert-St Louis
Sep 23
STL12:43 pmLambert-St Louis
14h 22m
1 stop
LHR9:05 amLondon Heathrow
$845
Finnair
Sep 2
LHR7:30 amLondon Heathrow
22h 21m
2 stops
STL11:51 pmLambert-St Louis
Sep 23
STL12:43 pmLambert-St Louis
19h 42m
1 stop
LHR2:25 pmLondon Heathrow
$849
Finnair
Sep 2
LHR7:30 amLondon Heathrow
22h 21m
2 stops
STL11:51 pmLambert-St Louis
Sep 23
STL12:43 pmLambert-St Louis
19h 42m
1 stop
LHR2:25 pmLondon Heathrow
$851

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 21
STL5:40 amLambert-St Louis
18h 40m
1 stop
LHR6:20 amLondon Heathrow
$850
American Airlines
Sep 7
LHR9:45 amLondon Heathrow
12h 03m
1 stop
STL3:48 pmLambert-St Louis
Sep 21
STL6:51 pmLambert-St Louis
13h 34m
1 stop
LHR2:25 pmLondon Heathrow
$856
American Airlines
Sep 9
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 20
STL9:40 pmLambert-St Louis
8h 00m
LHR11:40 amLondon Heathrow
$890

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 April 19, 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

Tue 5/5

10:45 am-4:42 pm

1 stop11h 57m

Lambert-St Louis

Sat 5/23

4:00 pm-1:05 pm

1 stop15h 05m

$825
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$830

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

12:55 pm-8:26 pm

1 stop13h 31m

Lambert-St Louis

Wed 9/23

12:47 pm-6:55 am

1 stop12h 08m

$831

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

10:05 am-8:26 pm

1 stop16h 21m

Lambert-St Louis

Tue 9/22

8:07 pm-12:15 pm

1 stop10h 08m

$836

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

7:30 am-11:51 pm

2 stops22h 21m

Lambert-St Louis

Wed 9/23

12:43 pm-9:05 am

1 stop14h 22m

$845

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

7:30 am-11:51 pm

2 stops22h 21m

Lambert-St Louis

Wed 9/23

12:43 pm-2:25 pm

1 stop19h 42m

$849

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/9

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Mon 9/21

5:40 am-6:20 am

1 stop18h 40m

$850

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 6/4

2:00 pm-11:57 pm

1 stop15h 57m

Lambert-St Louis

Tue 6/16

6:31 pm-10:00 am

2 stops33h 29m

$855

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 9/8

11:30 am-7:46 pm

2 stops38h 16m

Lambert-St Louis

Tue 9/22

11:18 am-10:50 am

2 stops17h 32m

$951

LondonSt. Louis

LCY - STL

LCYSTL

London City

Fri 9/25

4:05 pm-8:03 pm

2 stops33h 58m

Lambert-St Louis

Sun 9/27

8:07 pm-9:10 am

2 stops31h 03m

$1,143

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 January is another great option to travel to St. Louis, with average flight prices from London averaging around $900.

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 $989 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 $870 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 17% 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 $998.
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
7,892 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,605 reviews
Search United Airlines flights
American AirlinesPriceFrom $692Free CancellationRating
7.1
11,617 reviews
Search American Airlines flights

  • American Airlines Flights From London to St. Louis

    American Airlines is one of the most popular airlines flying from London to St. Louis, operating 1 flight/week on average for this route. A good American Airlines flight deal for London to St. Louis starts from $692 round-trip, up to an average price of $1,384. Our users have rated American Airlines at 7.1/10.

  • British Airways Flights From London to St. Louis

    Another popular option for London to St. Louis flights is British Airways (6.7/10, 7,892 ratings). British Airways flies from London to St. Louis around 1 time per week, with deals starting from $555 round-trip and rising to an average price of around $849.

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
Festus
Clayton
Eureka
Litchfield
Edwardsville
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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