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Cheap flights from London Heathrow Airport to St. Louis from $539

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 Heathrow Airport to St. Louis departing on 9/2. 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 Heathrow Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
12:47 pm - 6:55 am
STL
-
LHR
12h 08m
1 stop
$844British Airways
Wed, Sep 2 - Wed, Sep 23
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
$846Finnair
Wed, Sep 2 - Wed, Sep 23
Finnair Logo
10:20 am - 11:51 pm
LHR
-
STL
19h 31m
2 stops
Finnair Logo
12:43 pm - 2:25 pm
STL
-
LHR
19h 42m
1 stop
$848Finnair
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
1:10 pm - 8:19 pm
LHR
-
STL
13h 09m
1 stop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$849British Airways
Wed, Sep 2 - Wed, Sep 23
Multiple Airlines Logo
8:40 am - 6:42 pm
LHR
-
STL
16h 02m
2 stops
Multiple Airlines Logo
6:51 pm - 2:25 pm
STL
-
LHR
13h 34m
1 stop
$868Multiple Airlines
Wed, Sep 2 - Wed, Sep 23
Multiple Airlines Logo
6:30 am - 1:25 pm
LHR
-
STL
12h 55m
1 stop
Multiple Airlines Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$870Multiple Airlines
Wed, Sep 23 - Wed, Sep 30
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$871British Airways
Tue, Sep 8 - Tue, Sep 22
Multiple Airlines Logo
6:30 am - 1:25 pm
LHR
-
STL
12h 55m
1 stop
Multiple Airlines Logo
12:43 pm - 9:05 am
STL
-
LHR
14h 22m
1 stop
$874Multiple Airlines
Wed, Sep 16 - Wed, Sep 23
British Airways Logo
8:55 am - 4:41 pm
LHR
-
STL
13h 46m
1 stop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$875British Airways
Tue, Sep 8 - Tue, Sep 22
British Airways Logo
1:10 pm - 8:19 pm
LHR
-
STL
13h 09m
1 stop
British Airways Logo
9:35 pm - 11:35 am
STL
-
LHR
8h 00mnonstop
$877British Airways
Tue, Sep 8 - Tue, Sep 22

American Airlines flights from London Heathrow Airport to St. Louis

Our best American Airlines deals on London Heathrow Airport to St. Louis flight tickets
American Airlines
Sep 8
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 22
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$897
American Airlines
Sep 23
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 30
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$944
American Airlines
Jun 1
LHR2:30 pmLondon Heathrow
15h 29m
2 stops
STL11:59 pmLambert-St Louis
Sep 10
STL6:51 pmLambert-St Louis
13h 34m
1 stop
LHR2:25 pmLondon Heathrow
$979

Delta flights from London Heathrow Airport to St. Louis

Our best Delta deals on London Heathrow Airport to St. Louis flight tickets
Delta
Sep 8
LHR6:30 amLondon Heathrow
16h 25m
2 stops
STL4:55 pmLambert-St Louis
Sep 22
STL5:30 pmLambert-St Louis
13h 45m
1 stop
LHR1:15 pmLondon Heathrow
$881
Delta
Sep 8
LHR6:30 amLondon Heathrow
16h 25m
2 stops
STL4:55 pmLambert-St Louis
Sep 22
STL1:30 pmLambert-St Louis
13h 20m
2 stops
LHR8:50 amLondon Heathrow
$883
Delta
Jun 1
LHR6:30 amLondon Heathrow
16h 16m
2 stops
STL4:46 pmLambert-St Louis
Sep 9
STL12:00 pmLambert-St Louis
16h 40m
2 stops
LHR10:40 amLondon Heathrow
$962

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport 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 26, 2026.
Use the filters below to find and compare flights from London Heathrow Airport 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

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/23

12:47 pm-6:55 am

1 stop12h 08m

$844

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

$846

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-2:25 pm

1 stop19h 42m

$848

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

1:10 pm-8:19 pm

1 stop13h 09m

Lambert-St Louis

Wed 9/23

4:47 pm-9:25 am

1 stop10h 38m

$849

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

8:40 am-6:42 pm

2 stops16h 02m

Lambert-St Louis

Wed 9/23

6:51 pm-2:25 pm

1 stop13h 34m

$868

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/23

6:30 am-1:25 pm

1 stop12h 55m

Lambert-St Louis

Wed 9/30

9:35 pm-11:35 am

Nonstop8h 00m

$870
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Tue 9/22

9:35 pm-11:35 am

Nonstop8h 00m

$871

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/16

6:30 am-1:25 pm

1 stop12h 55m

Lambert-St Louis

Wed 9/23

12:43 pm-9:05 am

1 stop14h 22m

$874

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

8:55 am-4:41 pm

1 stop13h 46m

Lambert-St Louis

Tue 9/22

9:35 pm-11:35 am

Nonstop8h 00m

$875

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

1:10 pm-8:19 pm

1 stop13h 09m

Lambert-St Louis

Tue 9/22

9:35 pm-11:35 am

Nonstop8h 00m

$877

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 Heathrow Airport 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 Heathrow Airport and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, February is the cheapest month to fly from London Heathrow Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $744. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $921.

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

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

How far in advance should I book a flight from London Heathrow Airport to St. Louis?

You are more likely to see cheaper flights to St. Louis from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $990 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 Heathrow Airport for as low as $870 on momondo.

What cabin class options are available on London Heathrow Airport to St. Louis flights?

There are 3 cabin classes available to choose from on London Heathrow Airport 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 Heathrow Airport to St. Louis flights?

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

How have London Heathrow Airport to St. Louis flight prices changed over time?

As of April 2026, prices for London Heathrow Airport to St. Louis flights are approximately 2% cheaper when compared to flights at the same time last year.

When to book flights from London Heathrow Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from London Heathrow Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap London Heathrow Airport to St. Louis (LHR to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport 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 Heathrow Airport in the past 72 hours is $679. The best round-trip flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is $998.
The fastest flight from London Heathrow Airport to St. Louis takes 9h 05m
Direct flights go from London Heathrow Airport 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 Heathrow Airport there are direct flights to Lambert-St Louis (STL).
Search flight deals

Frequently asked questions about flying from London Heathrow Airport to St. Louis

  • How far is London Heathrow to Lambert-St Louis by plane?

    The straight-line distance from London Heathrow to Lambert-St Louis is 4185.8 mi. By plane, this route typically takes 9h 05m.

  • When did momondo last update prices for flights from London Heathrow Airport to Lambert-St Louis Airport?

    Prices for flights from London Heathrow Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from London Heathrow Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from London Heathrow Airport 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 Heathrow Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London Heathrow Airport to St. Louis?

  • What is the most popular airline from London Heathrow Airport to St. Louis?

Best airlines flying from London Heathrow Airport to St. Louis

Compare and see reviews for airlines that fly from London Heathrow Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $555Free CancellationRating
6.7
7,917 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,657 reviews
Search United Airlines flights
American AirlinesPriceFrom $692Free CancellationRating
7.1
11,676 reviews
Search American Airlines flights

  • American Airlines Flights From London Heathrow Airport to St. Louis

    The lowest priced American Airlines flight from London Heathrow Airport to St. Louis from the last 72 hours was $692. Generally, American Airlines has 4 flights on this route every week with an average price of $1,143. American Airlines is rated 7.1/10 by our users.

  • British Airways Flights From London Heathrow Airport to St. Louis

    Another popular option for London Heathrow Airport to St. Louis flights is British Airways (6.7/10, 7,917 ratings). British Airways flies from London Heathrow Airport 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?

It is quick and easy to find London to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from London to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from London which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from London to St. Louis?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to St. Louis from London.

I’m not ready to book a flight from London to St. Louis right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to St. Louis from London. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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.
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