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Cheap flights from London Heathrow Airport to St. Louis from $492

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
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
8:20 am - 5:13 pm
LHR
-
STL
13h 53m
1 stop
British Airways Logo
6:08 pm - 11:40 am
STL
-
LHR
12h 32m
1 stop
$720British Airways
Tue, Mar 17 - Tue, Mar 24
Finnair Logo
5:00 pm - 11:29 am
LHR
-
STL
23h 29m
2 stops
Finnair Logo
4:13 pm - 10:00 am
STL
-
LHR
12h 47m
1 stop
$723Finnair
Tue, Mar 17 - Tue, Mar 24
Finnair Logo
10:20 am - 10:17 pm
LHR
-
STL
17h 57m
2 stops
Finnair Logo
5:21 pm - 12:15 pm
STL
-
LHR
12h 54m
1 stop
$737Finnair
Mon, Apr 20 - Thu, Apr 30
British Airways Logo
11:10 am - 4:41 pm
LHR
-
STL
11h 31m
1 stop
British Airways Logo
8:03 pm - 12:15 pm
STL
-
LHR
10h 12m
1 stop
$738British Airways
Mon, Apr 20 - Thu, Apr 30
British Airways Logo
6:15 am - 7:29 pm
LHR
-
STL
19h 14m
2 stops
British Airways Logo
7:05 am - 7:40 am
STL
-
LHR
18h 35m
1 stop
$747British Airways
Mon, Apr 20 - Thu, Apr 30
British Airways Logo
6:15 am - 7:29 pm
LHR
-
STL
19h 14m
2 stops
British Airways Logo
7:12 am - 8:05 am
STL
-
LHR
18h 53m
1 stop
$749British Airways
Mon, Apr 20 - Thu, Apr 30
Delta Logo
10:00 am - 11:58 pm
LHR
-
STL
18h 58m
2 stops
Delta Logo
12:04 pm - 11:40 am
STL
-
LHR
18h 36m
1 stop
$751Delta
Mon, Mar 16 - Mon, Mar 23
Finnair Logo
11:15 am - 11:58 pm
LHR
-
STL
17h 43m
1 stop
Finnair Logo
11:22 am - 12:05 pm
STL
-
LHR
19h 43m
1 stop
$754Finnair
Mon, Mar 16 - Mon, Mar 23
British Airways Logo
3:15 pm - 10:17 pm
LHR
-
STL
13h 02m
1 stop
British Airways Logo
6:11 pm - 12:10 pm
STL
-
LHR
11h 59m
1 stop
$761British Airways
Mon, Apr 20 - Thu, Apr 30
British Airways Logo
4:35 pm - 11:02 pm
LHR
-
STL
35h 27m
2 stops
British Airways Logo
6:57 pm - 7:20 am
STL
-
LHR
31h 23m
1 stop
$762British Airways
Sun, Mar 15 - Sun, Mar 22

Virgin Atlantic flights from London Heathrow Airport to St. Louis

Our best Virgin Atlantic deals on London Heathrow Airport to St. Louis flight tickets
Virgin Atlantic
Mar 15
LHR7:20 pmLondon Heathrow
33h 38m
2 stops
STL11:58 pmLambert-St Louis
Mar 22
STL6:59 pmLambert-St Louis
30h 26m
1 stop
LHR6:25 amLondon Heathrow
$770
Virgin Atlantic
Apr 20
LHR10:45 amLondon Heathrow
18h 28m
2 stops
STL11:13 pmLambert-St Louis
Apr 30
STL10:50 amLambert-St Louis
13h 55m
2 stops
LHR6:45 amLondon Heathrow
$784
Virgin Atlantic
Apr 20
LHR10:45 amLondon Heathrow
18h 28m
2 stops
STL11:13 pmLambert-St Louis
Apr 30
STL10:50 amLambert-St Louis
13h 55m
2 stops
LHR6:45 amLondon Heathrow
$786

Finnair flights from London Heathrow Airport to St. Louis

Our best Finnair deals on London Heathrow Airport to St. Louis flight tickets
Finnair
Apr 20
LHR10:20 amLondon Heathrow
17h 57m
2 stops
STL10:17 pmLambert-St Louis
Apr 30
STL5:21 pmLambert-St Louis
12h 54m
1 stop
LHR12:15 pmLondon Heathrow
$737
Finnair
Mar 16
LHR11:15 amLondon Heathrow
17h 43m
1 stop
STL11:58 pmLambert-St Louis
Mar 23
STL11:22 amLambert-St Louis
19h 43m
1 stop
LHR12:05 pmLondon Heathrow
$754
Finnair
Apr 20
LHR9:45 amLondon Heathrow
18h 32m
1 stop
STL10:17 pmLambert-St Louis
Apr 30
STL5:21 pmLambert-St Louis
11h 09m
1 stop
LHR10:30 amLondon Heathrow
$763

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 February 17, 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

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 3/17

8:20 am-5:13 pm

1 stop13h 53m

Lambert-St Louis

Tue 3/24

6:08 pm-11:40 am

1 stop12h 32m

$720

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 3/17

5:00 pm-11:29 am

2 stops23h 29m

Lambert-St Louis

Tue 3/24

4:13 pm-10:00 am

1 stop12h 47m

$723

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/20

10:20 am-10:17 pm

2 stops17h 57m

Lambert-St Louis

Thu 4/30

5:21 pm-12:15 pm

1 stop12h 54m

$737

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/20

11:10 am-4:41 pm

1 stop11h 31m

Lambert-St Louis

Thu 4/30

8:03 pm-12:15 pm

1 stop10h 12m

$738

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/20

6:15 am-7:29 pm

2 stops19h 14m

Lambert-St Louis

Thu 4/30

7:05 am-7:40 am

1 stop18h 35m

$747

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/20

6:15 am-7:29 pm

2 stops19h 14m

Lambert-St Louis

Thu 4/30

7:12 am-8:05 am

1 stop18h 53m

$749

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/16

10:00 am-11:58 pm

2 stops18h 58m

Lambert-St Louis

Mon 3/23

12:04 pm-11:40 am

1 stop18h 36m

$751

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/16

11:15 am-11:58 pm

1 stop17h 43m

Lambert-St Louis

Mon 3/23

11:22 am-12:05 pm

1 stop19h 43m

$754

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/20

3:15 pm-10:17 pm

1 stop13h 02m

Lambert-St Louis

Thu 4/30

6:11 pm-12:10 pm

1 stop11h 59m

$761

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 3/15

4:35 pm-11:02 pm

2 stops35h 27m

Lambert-St Louis

Sun 3/22

6:57 pm-7:20 am

1 stop31h 23m

$762

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 $722. The month of March is another great option to travel to St. Louis, with average flight prices from London Heathrow Airport averaging around $904.

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 $867 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?

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 February 2026, prices for London Heathrow Airport to St. Louis flights are approximately 4% 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

Best Price Found

$446

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 $446. 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
7,751 reviews
Search British Airways flights
United AirlinesPriceFrom $654Free CancellationRating
7.4
9,314 reviews
Search United Airlines flights
American AirlinesPriceFrom $692Free CancellationRating
7.2
11,304 reviews
Search American 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
Maryland Heights
Florissant
O'Fallon
Collinsville
St. Peters
Fenton
Wentzville
Alton
Farmington
Clayton
Edwardsville
Eureka
Festus
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.

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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