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Cheap flights from London Heathrow Airport to St. Louis from $430

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 4/27. 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 Heathrow Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
12:30 pm - 7:29 pm
LHR
-
STL
12h 59m
1 stop
British Airways Logo
8:03 pm - 12:15 pm
STL
-
LHR
10h 12m
1 stop
$709British Airways
Tue, Apr 21 - Wed, Apr 29
Finnair Logo
6:05 pm - 5:12 pm
LHR
-
STL
29h 07m
2 stops
Finnair Logo
2:12 pm - 9:05 am
STL
-
LHR
12h 53m
1 stop
$723Finnair
Tue, Apr 21 - Wed, Apr 29
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
$725British Airways
Tue, Apr 21 - Wed, Apr 29
British Airways Logo
4:25 pm - 7:30 pm
LHR
-
STL
9h 05mnonstop
British Airways Logo
7:45 pm - 2:25 pm
STL
-
LHR
12h 40m
1 stop
$741British Airways
Wed, Sep 2 - Wed, Sep 9
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
$743British Airways
Wed, Sep 2 - Wed, Sep 23
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
$745British Airways
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
12:00 pm - 7:23 pm
LHR
-
STL
13h 23m
1 stop
British Airways Logo
4:47 pm - 9:25 am
STL
-
LHR
10h 38m
1 stop
$746British Airways
Wed, Sep 2 - Wed, Sep 9
Finnair Logo
10:05 am - 8:19 pm
LHR
-
STL
16h 14m
2 stops
Finnair Logo
7:44 am - 7:40 am
STL
-
LHR
17h 56m
1 stop
$747Finnair
Wed, Sep 2 - Wed, Sep 23
British Airways Logo
9:45 am - 4:41 pm
LHR
-
STL
12h 56m
1 stop
British Airways Logo
8:03 pm - 12:15 pm
STL
-
LHR
10h 12m
1 stop
$748British Airways
Wed, Apr 22 - Wed, Apr 29
British Airways Logo
8:55 am - 4:51 pm
LHR
-
STL
13h 56m
1 stop
British Airways Logo
12:47 pm - 6:55 am
STL
-
LHR
12h 08m
1 stop
$749British Airways
Wed, Sep 2 - Wed, Sep 23

British Airways flights from London Heathrow Airport to St. Louis

Our best British Airways deals on London Heathrow Airport to St. Louis flight tickets
British Airways
Apr 21
LHR12:30 pmLondon Heathrow
12h 59m
1 stop
STL7:29 pmLambert-St Louis
Apr 29
STL8:03 pmLambert-St Louis
10h 12m
1 stop
LHR12:15 pmLondon Heathrow
$709
British Airways
Apr 21
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Apr 29
STL9:35 pmLambert-St Louis
8h 00m
LHR11:35 amLondon Heathrow
$725
British Airways
Sep 2
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
Sep 9
STL7:45 pmLambert-St Louis
12h 40m
1 stop
LHR2:25 pmLondon Heathrow
$741

Finnair flights from London Heathrow Airport to St. Louis

Our best Finnair deals on London Heathrow Airport to St. Louis flight tickets
Finnair
Apr 21
LHR6:05 pmLondon Heathrow
29h 07m
2 stops
STL5:12 pmLambert-St Louis
Apr 29
STL2:12 pmLambert-St Louis
12h 53m
1 stop
LHR9:05 amLondon Heathrow
$723
Finnair
Sep 2
LHR9:15 amLondon Heathrow
16h 18m
1 stop
STL7:33 pmLambert-St Louis
Sep 23
STL9:46 amLambert-St Louis
16h 14m
1 stop
LHR8:00 amLondon Heathrow
$747
Finnair
Apr 22
LHR12:30 pmLondon Heathrow
12h 59m
1 stop
STL7:29 pmLambert-St Louis
Apr 28
STL3:24 pmLambert-St Louis
11h 41m
1 stop
LHR9:05 amLondon Heathrow
$750

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 March 10, 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 4/21

12:30 pm-7:29 pm

1 stop12h 59m

Lambert-St Louis

Wed 4/29

8:03 pm-12:15 pm

1 stop10h 12m

$709

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/21

6:05 pm-5:12 pm

2 stops29h 07m

Lambert-St Louis

Wed 4/29

2:12 pm-9:05 am

1 stop12h 53m

$723
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/21

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 4/29

9:35 pm-11:35 am

Nonstop8h 00m

$725

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

4:25 pm-7:30 pm

Nonstop9h 05m

Lambert-St Louis

Wed 9/9

7:45 pm-2:25 pm

1 stop12h 40m

$741

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

$743

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

$745

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

12:00 pm-7:23 pm

1 stop13h 23m

Lambert-St Louis

Wed 9/9

4:47 pm-9:25 am

1 stop10h 38m

$746

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

10:05 am-8:19 pm

2 stops16h 14m

Lambert-St Louis

Wed 9/23

7:44 am-7:40 am

1 stop17h 56m

$747

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/22

9:45 am-4:41 pm

1 stop12h 56m

Lambert-St Louis

Wed 4/29

8:03 pm-12:15 pm

1 stop10h 12m

$748

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

8:55 am-4:51 pm

1 stop13h 56m

Lambert-St Louis

Wed 9/23

12:47 pm-6:55 am

1 stop12h 08m

$749

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 $743. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $940.

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 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 $988 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 $869 on momondo.

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

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

You could potentially save up to 1% on your flight if you consider stops on a London Heathrow Airport to St. Louis flight.

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

As of March 2026, prices for London Heathrow Airport to St. Louis flights are approximately 24% 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

$589

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 $589. The best round-trip flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is $803.
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

  • 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
7,781 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,409 reviews
Search United 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
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Fenton
Alton
Wentzville
Farmington
Edwardsville
Festus
Clayton
Eureka
Litchfield
Glencoe
Shrewsbury

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.

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