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Cheap flights from London to St. Louis from $382

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 5/28. 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.
British Airways Logo
12:15 pm - 7:14 pm
LHR
-
STL
12h 59m
1 stop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$831British Airways
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
3:00 pm - 10:40 pm
LHR
-
STL
13h 40m
1 stop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$834British Airways
Wed, Sep 2 - Wed, Sep 23
Multiple Airlines Logo
2:00 pm - 11:57 pm
LGW
-
STL
15h 57m
1 stop
Multiple Airlines Logo
4:17 pm - 10:00 am
STL
-
LGW
35h 43m
1 stop
$843Multiple Airlines
Thu, May 28 - Sat, Jul 4
Finnair Logo
10:20 am - 11:51 pm
LHR
-
STL
19h 31m
2 stops
Finnair Logo
12:43 pm - 9:05 am
STL
-
LHR
14h 22m
1 stop
$848Finnair
Wed, Sep 2 - Wed, Sep 23
Finnair Logo
6:10 pm - 11:20 pm
LHR
-
STL
35h 10m
2 stops
Finnair Logo
12:43 pm - 12:50 pm
STL
-
LHR
18h 07m
1 stop
$850Finnair
Mon, Sep 14 - Mon, Sep 21
Multiple Airlines Logo
2:00 pm - 11:57 pm
LGW
-
STL
15h 57m
1 stop
Multiple Airlines Logo
8:08 pm - 10:55 am
STL
-
LGW
32h 47m
2 stops
$851Multiple Airlines
Tue, Jun 2 - Sat, Jun 6
KLM Logo
11:45 am - 11:37 pm
LHR
-
STL
17h 52m
2 stops
KLM Logo
11:51 am - 6:25 am
STL
-
LHR
12h 34m
1 stop
$854KLM
Tue, Sep 8 - Tue, Sep 22
American Airlines Logo
2:25 pm - 11:42 pm
LHR
-
STL
15h 17m
1 stop
American Airlines Logo
4:18 pm - 10:30 am
STL
-
LHR
12h 12m
1 stop
$855American Airlines
Fri, Aug 28 - Thu, Sep 3
American Airlines Logo
10:05 am - 6:15 pm
LHR
-
STL
14h 10m
1 stop
American Airlines Logo
6:55 pm - 6:55 pm
STL
-
LHR
18h 00m
1 stop
$859American Airlines
Mon, Sep 14 - Sun, Sep 20
KLM Logo
1:45 pm - 11:59 pm
LCY
-
STL
16h 14m
2 stops
KLM Logo
6:57 pm - 5:20 pm
STL
-
LCY
16h 23m
2 stops
$1,194KLM
Sun, May 10 - Tue, May 26

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British Airways flights from London to St. Louis

Our best British Airways deals on London to St. Louis flight tickets
British Airways
Sep 2
LHR12:15 pmLondon Heathrow
12h 59m
1 stop
STL7:14 pmLambert-St Louis
Sep 23
STL4:47 pmLambert-St Louis
10h 38m
1 stop
LHR9:25 amLondon Heathrow
$831
British Airways
Sep 2
LHR3:00 pmLondon Heathrow
13h 40m
1 stop
STL10:40 pmLambert-St Louis
Sep 23
STL4:47 pmLambert-St Louis
10h 38m
1 stop
LHR9:25 amLondon Heathrow
$834
British Airways
Sep 2
LHR3:00 pmLondon Heathrow
13h 40m
1 stop
STL10:40 pmLambert-St Louis
Sep 23
STL12:47 pmLambert-St Louis
12h 08m
1 stop
LHR6:55 amLondon Heathrow
$835

Finnair flights from London to St. Louis

Our best Finnair deals on London to St. Louis flight tickets
Finnair
Sep 2
LHR10:20 amLondon Heathrow
19h 31m
2 stops
STL11:51 pmLambert-St Louis
Sep 23
STL12:43 pmLambert-St Louis
14h 22m
1 stop
LHR9:05 amLondon Heathrow
$848
Finnair
Sep 14
LHR6:10 pmLondon Heathrow
35h 10m
2 stops
STL11:20 pmLambert-St Louis
Sep 21
STL12:43 pmLambert-St Louis
18h 07m
1 stop
LHR12:50 pmLondon Heathrow
$850
Finnair
Sep 15
LHR10:20 amLondon Heathrow
19h 00m
2 stops
STL11:20 pmLambert-St Louis
Sep 25
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$886

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 23, 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
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

12:15 pm-7:14 pm

1 stop12h 59m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$831

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

3:00 pm-10:40 pm

1 stop13h 40m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$834

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 5/28

2:00 pm-11:57 pm

1 stop15h 57m

Lambert-St Louis

Sat 7/4

4:17 pm-10:00 am

1 stop35h 43m

$843

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

10:20 am-11:51 pm

2 stops19h 31m

Lambert-St Louis

Wed 9/23

12:43 pm-9:05 am

1 stop14h 22m

$848

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 9/14

6:10 pm-11:20 pm

2 stops35h 10m

Lambert-St Louis

Mon 9/21

12:43 pm-12:50 pm

1 stop18h 07m

$850

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 6/2

2:00 pm-11:57 pm

1 stop15h 57m

Lambert-St Louis

Sat 6/6

8:08 pm-10:55 am

2 stops32h 47m

$851

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

11:45 am-11:37 pm

2 stops17h 52m

Lambert-St Louis

Tue 9/22

11:51 am-6:25 am

1 stop12h 34m

$854

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 8/28

2:25 pm-11:42 pm

1 stop15h 17m

Lambert-St Louis

Thu 9/3

4:18 pm-10:30 am

1 stop12h 12m

$855

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 9/14

10:05 am-6:15 pm

1 stop14h 10m

Lambert-St Louis

Sun 9/20

6:55 pm-6:55 pm

1 stop18h 00m

$859

LondonSt. Louis

LCY - STL

LCYSTL

London City

Sun 5/10

1:45 pm-11:59 pm

2 stops16h 14m

Lambert-St Louis

Tue 5/26

6:57 pm-5:20 pm

2 stops16h 23m

$1,194

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

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 from London 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 St. Louis flights?

There are 3 cabin classes available to choose from on London to 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?

No. A direct flight is the cheapest option for a flight between London to St. Louis.

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
7,910 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,644 reviews
Search United Airlines flights
American AirlinesPriceFrom $692Free CancellationRating
7.1
11,664 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 4 flights/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 $1,143. 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, 7,906 ratings). British Airways flies from London to St. Louis around 4 times per week, with deals starting from $555 round-trip and rising to an average price of around $869.

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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