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Cheap flights from London Heathrow Airport to St. Louis from $453

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 12/16. 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

Scandinavian Airlines Logo
6:40 am - 9:58 pmLHR-STL
21h 18m2 stops
Scandinavian Airlines Logo
1:55 pm - 6:30 pmSTL-LHR
22h 35m2 stops
$805Scandinavian Airlines
Find Deal
Mon, Nov 24 - Mon, Dec 1
Scandinavian Airlines Logo
7:05 am - 11:40 pmLHR-STL
22h 35m3 stops
Scandinavian Airlines Logo
11:40 am - 9:40 pmSTL-LHR
28h 00m2 stops
$808Scandinavian Airlines
Find Deal
Thu, Nov 20 - Mon, Dec 8
Scandinavian Airlines Logo
7:05 am - 11:40 pmLHR-STL
22h 35m3 stops
Scandinavian Airlines Logo
11:40 am - 4:00 pmSTL-LHR
22h 20m2 stops
$809Scandinavian Airlines
Find Deal
Thu, Nov 20 - Mon, Dec 8
United Airlines Logo
7:30 am - 11:44 pmLHR-STL
21h 14m2 stops
United Airlines Logo
11:49 am - 6:20 amSTL-LHR
12h 31m1 stop
$834United Airlines
Find Deal
Tue, Oct 28 - Tue, Nov 4
Lufthansa Logo
6:30 am - 2:55 pmLHR-STL
13h 25m1 stop
Lufthansa Logo
12:31 pm - 5:55 amSTL-LHR
11h 24m1 stop
$847Lufthansa
Find Deal
Wed, Oct 29 - Wed, Nov 5
United Airlines Logo
8:00 am - 4:07 pmLHR-STL
14h 07m1 stop
United Airlines Logo
11:49 am - 6:20 amSTL-LHR
12h 31m1 stop
$856United Airlines
Find Deal
Wed, Oct 22 - Tue, Nov 4
Virgin Atlantic Logo
10:45 am - 6:35 pmLHR-STL
13h 50m1 stop
Virgin Atlantic Logo
1:55 pm - 7:50 amSTL-LHR
11h 55m1 stop
$862Virgin Atlantic
Find Deal
Mon, Nov 24 - Mon, Dec 1
Austrian Airlines Logo
7:25 pm - 5:39 pmLHR-STL
28h 14m2 stops
Austrian Airlines Logo
1:00 pm - 5:55 amSTL-LHR
10h 55m1 stop
$874Austrian Airlines
Find Deal
Thu, Nov 20 - Mon, Dec 8
Lufthansa Logo
6:30 pm - 1:55 pmLHR-STL
25h 25m1 stop
Lufthansa Logo
1:00 pm - 7:55 amSTL-LHR
12h 55m1 stop
$875Lufthansa
Find Deal
Thu, Nov 20 - Mon, Dec 8
Virgin Atlantic Logo
7:15 pm - 11:07 pmLHR-STL
33h 52m2 stops
Virgin Atlantic Logo
6:52 pm - 7:15 amSTL-LHR
30h 23m2 stops
$986Virgin Atlantic
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Mon, Oct 13 - Mon, Oct 20

Scandinavian Airlines flights from London Heathrow Airport to St. Louis

Our best Scandinavian Airlines deals on London Heathrow Airport to St. Louis flight tickets
Scandinavian Airlines
Nov 24
LHR6:40 amLondon Heathrow
21h 18m
2 stops
STL9:58 pmLambert-St Louis
Dec 1
STL1:55 pmLambert-St Louis
22h 35m
2 stops
LHR6:30 pmLondon Heathrow
$805
Find similar
Scandinavian Airlines
Nov 20
LHR7:05 amLondon Heathrow
22h 35m
3 stops
STL11:40 pmLambert-St Louis
Dec 8
STL11:40 amLambert-St Louis
28h 00m
2 stops
LHR9:40 pmLondon Heathrow
$808
Find similar
Scandinavian Airlines
Nov 20
LHR7:05 amLondon Heathrow
22h 35m
3 stops
STL11:40 pmLambert-St Louis
Dec 8
STL11:40 amLambert-St Louis
22h 20m
2 stops
LHR4:00 pmLondon Heathrow
$809
Find similar

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
Oct 28
LHR7:30 amLondon Heathrow
21h 14m
2 stops
STL11:44 pmLambert-St Louis
Nov 4
STL11:49 amLambert-St Louis
12h 31m
1 stop
LHR6:20 amLondon Heathrow
$834
Find similar
United Airlines
Oct 22
LHR8:00 amLondon Heathrow
14h 07m
1 stop
STL4:07 pmLambert-St Louis
Nov 4
STL11:49 amLambert-St Louis
12h 31m
1 stop
LHR6:20 amLondon Heathrow
$856
Find similar
United Airlines
Oct 28
LHR12:50 pmLondon Heathrow
15h 54m
1 stop
STL11:44 pmLambert-St Louis
Nov 4
STL7:00 amLambert-St Louis
22h 05m
1 stop
LHR11:05 amLondon Heathrow
$857
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 September 15, 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 11/24

6:40 am-9:58 pm

2 stops21h 18m

Lambert-St Louis

Mon 12/1

1:55 pm-6:30 pm

2 stops22h 35m

$805

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 11/20

7:05 am-11:40 pm

3 stops22h 35m

Lambert-St Louis

Mon 12/8

11:40 am-9:40 pm

2 stops28h 00m

$808

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 11/20

7:05 am-11:40 pm

3 stops22h 35m

Lambert-St Louis

Mon 12/8

11:40 am-4:00 pm

2 stops22h 20m

$809

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 10/28

7:30 am-11:44 pm

2 stops21h 14m

Lambert-St Louis

Tue 11/4

11:49 am-6:20 am

1 stop12h 31m

$834

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 10/29

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Wed 11/5

12:31 pm-5:55 am

1 stop11h 24m

$847

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 10/22

8:00 am-4:07 pm

1 stop14h 07m

Lambert-St Louis

Tue 11/4

11:49 am-6:20 am

1 stop12h 31m

$856

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 11/24

10:45 am-6:35 pm

1 stop13h 50m

Lambert-St Louis

Mon 12/1

1:55 pm-7:50 am

1 stop11h 55m

$862

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 11/20

7:25 pm-5:39 pm

2 stops28h 14m

Lambert-St Louis

Mon 12/8

1:00 pm-5:55 am

1 stop10h 55m

$874

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 11/20

6:30 pm-1:55 pm

1 stop25h 25m

Lambert-St Louis

Mon 12/8

1:00 pm-7:55 am

1 stop12h 55m

$875

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 10/13

7:15 pm-11:07 pm

2 stops33h 52m

Lambert-St Louis

Mon 10/20

6:52 pm-7:15 am

2 stops30h 23m

$986

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 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 $815. 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.

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 $972 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 $880 on momondo.

Can stopping save me money on London Heathrow Airport to St. Louis flights?

You could potentially save up to 5% 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 September 2025, prices for London Heathrow Airport to St. Louis flights are approximately 15% 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

Direct flights

None
There are no direct flights from London Heathrow Airport to St. Louis. There are no popular flight routes from London Heathrow Airport to St. Louis.
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  • 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 11h 44m.

  • 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 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
6.6
7,361 reviews
Search British Airways flights
LufthansaPriceFrom $925Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
United AirlinesPriceFrom $952Free CancellationRating
7.4
8,931 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
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
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

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