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Cheap flights from London Heathrow Airport to St. Louis from $480

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 1/23. 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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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
3:00 pm - 10:55 pm
LHR
-
STL
13h 55m1 stop
British Airways Logo
5:04 pm - 12:15 pm
STL
-
LHR
13h 11m1 stop
$707British Airways
Mon, Jan 26 - Mon, Feb 2
Finnair Logo
10:35 am - 9:51 pm
LHR
-
STL
17h 16m2 stops
Finnair Logo
9:54 am - 6:20 am
STL
-
LHR
14h 26m2 stops
$719Finnair
Mon, Jan 26 - Mon, Feb 2
British Airways Logo
11:45 am - 6:34 pm
LHR
-
STL
12h 49m1 stop
British Airways Logo
3:40 pm - 12:15 pm
STL
-
LHR
14h 35m1 stop
$732British Airways
Tue, Jan 27 - Tue, Feb 3
British Airways Logo
2:45 pm - 11:12 pm
LHR
-
STL
14h 27m1 stop
British Airways Logo
2:54 pm - 9:15 am
STL
-
LHR
12h 21m1 stop
$734British Airways
Tue, Jan 27 - Tue, Feb 3
Delta Logo
10:00 am - 8:43 pm
LHR
-
STL
16h 43m2 stops
Delta Logo
11:23 am - 8:45 am
STL
-
LHR
15h 22m2 stops
$738Delta
Tue, Jan 27 - Tue, Feb 3
British Airways Logo
8:20 am - 4:14 pm
LHR
-
STL
13h 54m1 stop
British Airways Logo
3:20 pm - 8:35 am
STL
-
LHR
11h 15m1 stop
$743British Airways
Thu, Jan 22 - Wed, Jan 28
British Airways Logo
2:10 pm - 9:15 pm
LHR
-
STL
13h 05m1 stop
British Airways Logo
1:35 pm - 8:15 am
STL
-
LHR
12h 40m1 stop
$745British Airways
Fri, Jan 16 - Mon, Jan 19
British Airways Logo
9:55 am - 6:34 pm
LHR
-
STL
14h 39m1 stop
British Airways Logo
5:04 pm - 11:40 am
STL
-
LHR
12h 36m1 stop
$746British Airways
Tue, Jan 13 - Fri, Jan 23
British Airways Logo
8:20 am - 4:14 pm
LHR
-
STL
13h 54m1 stop
British Airways Logo
5:04 pm - 11:40 am
STL
-
LHR
12h 36m1 stop
$747British Airways
Tue, Jan 13 - Fri, Jan 23
Virgin Atlantic Logo
11:45 am - 11:39 pm
LHR
-
STL
17h 54m2 stops
Virgin Atlantic Logo
6:57 pm - 11:40 am
STL
-
LHR
10h 43m1 stop
$748Virgin Atlantic
Tue, Jan 13 - Fri, Jan 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
Jan 26
LHR3:00 pmLondon Heathrow
13h 55m
1 stop
STL10:55 pmLambert-St Louis
Feb 2
STL5:04 pmLambert-St Louis
13h 11m
1 stop
LHR12:15 pmLondon Heathrow
$707
Find similar
British Airways
Apr 22
LHR4:25 pmLondon Heathrow
9h 05m
STL7:30 pmLambert-St Louis
May 6
STL2:19 pmLambert-St Louis
10h 51m
1 stop
LHR7:10 amLondon Heathrow
$716
Find similar
British Airways
Apr 22
LHR12:30 pmLondon Heathrow
13h 33m
1 stop
STL8:03 pmLambert-St Louis
May 6
STL2:19 pmLambert-St Louis
10h 51m
1 stop
LHR7:10 amLondon Heathrow
$721
Find similar

Finnair flights from London Heathrow Airport to St. Louis

Our best Finnair deals on London Heathrow Airport to St. Louis flight tickets
Finnair
Jan 26
LHR9:55 amLondon Heathrow
14h 39m
1 stop
STL6:34 pmLambert-St Louis
Feb 2
STL9:54 amLambert-St Louis
14h 26m
2 stops
LHR6:20 amLondon Heathrow
$719
Find similar
Finnair
Apr 22
LHR7:30 amLondon Heathrow
20h 18m
2 stops
STL9:48 pmLambert-St Louis
May 6
STL6:29 pmLambert-St Louis
10h 01m
1 stop
LHR10:30 amLondon Heathrow
$722
Find similar
Finnair
Jan 22
LHR10:35 amLondon Heathrow
17h 16m
2 stops
STL9:51 pmLambert-St Louis
Jan 28
STL2:54 pmLambert-St Louis
12h 46m
2 stops
LHR9:40 amLondon Heathrow
$756
Find similar

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 December 14, 2025.
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

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 1/26

3:00 pm-10:55 pm

1 stop13h 55m

Lambert-St Louis

Mon 2/2

5:04 pm-12:15 pm

1 stop13h 11m

$707

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 1/26

10:35 am-9:51 pm

2 stops17h 16m

Lambert-St Louis

Mon 2/2

9:54 am-6:20 am

2 stops14h 26m

$719

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/27

11:45 am-6:34 pm

1 stop12h 49m

Lambert-St Louis

Tue 2/3

3:40 pm-12:15 pm

1 stop14h 35m

$732

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/27

2:45 pm-11:12 pm

1 stop14h 27m

Lambert-St Louis

Tue 2/3

2:54 pm-9:15 am

1 stop12h 21m

$734

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/27

10:00 am-8:43 pm

2 stops16h 43m

Lambert-St Louis

Tue 2/3

11:23 am-8:45 am

2 stops15h 22m

$738

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/22

8:20 am-4:14 pm

1 stop13h 54m

Lambert-St Louis

Wed 1/28

3:20 pm-8:35 am

1 stop11h 15m

$743

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/16

2:10 pm-9:15 pm

1 stop13h 05m

Lambert-St Louis

Mon 1/19

1:35 pm-8:15 am

1 stop12h 40m

$745

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

9:55 am-6:34 pm

1 stop14h 39m

Lambert-St Louis

Fri 1/23

5:04 pm-11:40 am

1 stop12h 36m

$746

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

8:20 am-4:14 pm

1 stop13h 54m

Lambert-St Louis

Fri 1/23

5:04 pm-11:40 am

1 stop12h 36m

$747

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

11:45 am-11:39 pm

2 stops17h 54m

Lambert-St Louis

Fri 1/23

6:57 pm-11:40 am

1 stop10h 43m

$748

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 $754. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $857.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $952. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,371. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from London Heathrow Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $1,075 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $1,229 per ticket.

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 $978 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 $851 on momondo.

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

There are 2 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?

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 December 2025, prices for London Heathrow Airport to St. Louis flights are approximately 13% more expensive 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

Fastest flight time

13h 53m

Direct flights

Thu and Sat

Airports in St. Louis

1 airport
The fastest flight from London Heathrow Airport to St. Louis takes 13h 53m
Direct flights go from London Heathrow Airport to St. Louis on 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 13h 53m.

  • 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
7,575 reviews
Search British Airways 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
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
Edwardsville
Eureka
Litchfield
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.

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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