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Cheap flights from London Heathrow Airport to St. Louis from $467

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.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from London Heathrow Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
6:30 am - 4:46 pm
LHR
-
STL
16h 16m
2 stops
Delta Logo
9:24 am - 7:10 am
STL
-
LHR
15h 46m
2 stops
$1,031Delta
Tue, Jul 7 - Tue, Jul 21
British Airways Logo
7:30 pm - 11:59 pm
LHR
-
STL
34h 29m
2 stops
British Airways Logo
7:22 pm - 2:25 pm
STL
-
LHR
13h 03m
1 stop
$1,032British Airways
Sat, Jun 27 - Mon, Jul 6
British Airways Logo
9:15 am - 5:02 pm
LHR
-
STL
13h 47m
1 stop
British Airways Logo
7:56 pm - 12:15 pm
STL
-
LHR
10h 19m
1 stop
$1,033British Airways
Sat, Jul 4 - Fri, Jul 10
British Airways Logo
9:45 am - 4:15 pm
LHR
-
STL
12h 30m
1 stop
British Airways Logo
7:38 am - 8:35 am
STL
-
LHR
19h 57m
1 stop
$1,034British Airways
Sat, Oct 17 - Fri, Oct 30
Air Canada Logo
8:40 am - 8:07 pm
LHR
-
STL
17h 27m
2 stops
Air Canada Logo
12:10 pm - 11:50 am
STL
-
LHR
17h 40m
2 stops
$1,035Air Canada
Wed, Jul 1 - Wed, Jul 8
British Airways Logo
12:00 pm - 8:03 pm
LHR
-
STL
14h 03m
1 stop
British Airways Logo
6:12 pm - 12:10 pm
STL
-
LHR
11h 58m
1 stop
$1,036British Airways
Sat, Jul 11 - Sat, Jul 18
Finnair Logo
2:45 pm - 12:16 am
LHR
-
STL
15h 31m
1 stop
Finnair Logo
1:14 pm - 2:25 pm
STL
-
LHR
19h 11m
1 stop
$1,037Finnair
Wed, Jul 8 - Fri, Jul 17
Delta Logo
9:55 am - 8:49 pm
LHR
-
STL
16h 54m
2 stops
Delta Logo
11:51 am - 6:20 am
STL
-
LHR
13h 29m
2 stops
$1,038Delta
Mon, Oct 19 - Wed, Oct 28
Finnair Logo
2:45 pm - 12:16 am
LHR
-
STL
15h 31m
1 stop
Finnair Logo
5:58 pm - 6:15 am
STL
-
LHR
30h 17m
2 stops
$1,039Finnair
Thu, Jul 9 - Tue, Jul 14
British Airways Logo
9:15 am - 5:25 pm
LHR
-
STL
14h 10m
1 stop
British Airways Logo
7:56 pm - 12:15 pm
STL
-
LHR
10h 19m
1 stop
$1,043British Airways
Sat, Jun 20 - Fri, Jul 10

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Finnair flights from London Heathrow Airport to St. Louis

Our best Finnair deals on London Heathrow Airport to St. Louis flight tickets
Finnair
Jul 8
LHR2:45 pmLondon Heathrow
15h 31m
1 stop
STL12:16 amLambert-St Louis
Jul 17
STL1:14 pmLambert-St Louis
19h 11m
1 stop
LHR2:25 pmLondon Heathrow
$1,037
Finnair
Jul 8
LHR9:45 amLondon Heathrow
20h 31m
1 stop
STL12:16 amLambert-St Louis
Jul 14
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$1,089
Finnair
Jul 8
LHR12:15 pmLondon Heathrow
18h 01m
1 stop
STL12:16 amLambert-St Louis
Jul 20
STL5:58 pmLambert-St Louis
33h 42m
2 stops
LHR9:40 amLondon Heathrow
$1,092

United Airlines flights from London Heathrow Airport to St. Louis

Our best United Airlines deals on London Heathrow Airport to St. Louis flight tickets
United Airlines
Aug 29
LHR10:00 amLondon Heathrow
16h 27m
1 stop
STL8:27 pmLambert-St Louis
Nov 20
STL6:15 amLambert-St Louis
19h 15m
1 stop
LHR7:30 amLondon Heathrow
$1,059
United Airlines
Jul 3
LHR7:30 amLondon Heathrow
16h 43m
2 stops
STL6:13 pmLambert-St Louis
Jul 28
STL11:25 amLambert-St Louis
13h 50m
2 stops
LHR7:15 amLondon Heathrow
$1,066
United Airlines
Jul 11
LHR8:00 amLondon Heathrow
12h 23m
1 stop
STL2:23 pmLambert-St Louis
Jul 15
STL7:05 pmLambert-St Louis
10h 50m
1 stop
LHR11:55 amLondon Heathrow
$1,099

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 June 8, 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

Tue 7/7

6:30 am-4:46 pm

2 stops16h 16m

Lambert-St Louis

Tue 7/21

9:24 am-7:10 am

2 stops15h 46m

$1,031

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 6/27

7:30 pm-11:59 pm

2 stops34h 29m

Lambert-St Louis

Mon 7/6

7:22 pm-2:25 pm

1 stop13h 03m

$1,032
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 7/4

9:15 am-5:02 pm

1 stop13h 47m

Lambert-St Louis

Fri 7/10

7:56 pm-12:15 pm

1 stop10h 19m

$1,033

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 10/17

9:45 am-4:15 pm

1 stop12h 30m

Lambert-St Louis

Fri 10/30

7:38 am-8:35 am

1 stop19h 57m

$1,034

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 7/1

8:40 am-8:07 pm

2 stops17h 27m

Lambert-St Louis

Wed 7/8

12:10 pm-11:50 am

2 stops17h 40m

$1,035

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 7/11

12:00 pm-8:03 pm

1 stop14h 03m

Lambert-St Louis

Sat 7/18

6:12 pm-12:10 pm

1 stop11h 58m

$1,036

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 7/8

2:45 pm-12:16 am

1 stop15h 31m

Lambert-St Louis

Fri 7/17

1:14 pm-2:25 pm

1 stop19h 11m

$1,037

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 10/19

9:55 am-8:49 pm

2 stops16h 54m

Lambert-St Louis

Wed 10/28

11:51 am-6:20 am

2 stops13h 29m

$1,038

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 7/9

2:45 pm-12:16 am

1 stop15h 31m

Lambert-St Louis

Tue 7/14

5:58 pm-6:15 am

2 stops30h 17m

$1,039

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 6/20

9:15 am-5:25 pm

1 stop14h 10m

Lambert-St Louis

Fri 7/10

7:56 pm-12:15 pm

1 stop10h 19m

$1,043

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 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 $745. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $909.

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 $993 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 $813 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 June 2026, prices for London Heathrow Airport to St. Louis flights are approximately 20% 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

$1,295

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
The best flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is $1,295
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
American AirlinesPriceFrom $692Free CancellationRating
7.1
11,645 reviews
Search American Airlines flights
British AirwaysPriceFrom $791Free CancellationRating
6.7
8,027 reviews
Search British Airways 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, 8,031 ratings). British Airways flies from London Heathrow Airport to St. Louis around 4 times per week, with deals starting from $791 round-trip and rising to an average price of around $962.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Fenton
Alton
Wentzville
Farmington
Festus
Eureka
Clayton
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

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