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Cheap flights from London Heathrow Airport to St. Louis from £367

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 18/11. 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 return flights

Enter your travel dates to find the best prices.
British Airways Logo
11:55 - 19:30LHR-STL
13h 35m1 stop
British Airways Logo
15:59 - 10:00STL-LHR
12h 01m1 stop
£548British Airways
Find Deal
Wed, 26 Nov - Wed, 3 Dec
Virgin Atlantic Logo
17:35 - 21:57LHR-STL
34h 22m2 stops
Virgin Atlantic Logo
19:02 - 07:50STL-LHR
30h 48m1 stop
£549Virgin Atlantic
Find Deal
Mon, 8 Dec - Tue, 23 Dec
Multiple Airlines Logo
11:45 - 18:43LHR-STL
12h 58m1 stop
Multiple Airlines Logo
11:41 - 10:00STL-LHR
16h 19m1 stop
£549Multiple Airlines
Find Deal
Mon, 8 Dec - Tue, 23 Dec
KLM Logo
11:45 - 20:47LHR-STL
15h 02m2 stops
KLM Logo
14:02 - 07:50STL-LHR
11h 48m1 stop
£552KLM
Find Deal
Wed, 3 Dec - Wed, 10 Dec
Finnair Logo
10:05 - 19:29LHR-STL
15h 24m1 stop
Finnair Logo
18:02 - 12:20STL-LHR
12h 18m1 stop
£556Finnair
Find Deal
Tue, 13 Jan - Fri, 23 Jan
Finnair Logo
18:10 - 19:29LHR-STL
31h 19m2 stops
Finnair Logo
11:55 - 11:40STL-LHR
17h 45m1 stop
£559Finnair
Find Deal
Tue, 13 Jan - Fri, 23 Jan
American Airlines Logo
15:00 - 22:57LHR-STL
13h 57m1 stop
American Airlines Logo
16:43 - 11:35STL-LHR
13h 52m1 stop
£580American Airlines
Find Deal
Thu, 5 Mar - Mon, 9 Mar
American Airlines Logo
11:55 - 19:26LHR-STL
13h 31m1 stop
American Airlines Logo
14:36 - 07:20STL-LHR
11h 44m1 stop
£585American Airlines
Find Deal
Thu, 5 Mar - Mon, 9 Mar
KLM Logo
11:45 - 20:46LHR-STL
15h 01m2 stops
KLM Logo
17:17 - 11:40STL-LHR
12h 23m1 stop
£596KLM
Find Deal
Mon, 24 Nov - Mon, 1 Dec
Iberia Logo
10:45 - 09:03LHR-STL
28h 18m2 stops
Iberia Logo
09:34 - 06:50STL-LHR
15h 16m1 stop
£614Iberia
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Thu, 8 Jan - Fri, 16 Jan

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
26 Nov
LHR11:55London Heathrow
13h 35m
1 stop
STL19:30Lambert-St Louis
3 Dec
STL15:59Lambert-St Louis
12h 01m
1 stop
LHR10:00London Heathrow
£548
Find similar
British Airways
13 Jan
LHR14:45London Heathrow
14h 27m
1 stop
STL23:12Lambert-St Louis
23 Jan
STL15:37Lambert-St Louis
12h 23m
1 stop
LHR10:00London Heathrow
£568
Find similar
British Airways
24 Nov
LHR15:00London Heathrow
13h 59m
1 stop
STL22:59Lambert-St Louis
1 Dec
STL15:43Lambert-St Louis
10h 32m
1 stop
LHR08:15London Heathrow
£571
Find similar

Delta flights from London Heathrow Airport to St. Louis

Our best Delta deals on London Heathrow Airport to St. Louis flight tickets
Delta
26 Nov
LHR08:40London Heathrow
18h 06m
2 stops
STL20:46Lambert-St Louis
3 Dec
STL09:30Lambert-St Louis
17h 15m
2 stops
LHR08:45London Heathrow
£552
Find similar
Delta
27 Nov
LHR06:30London Heathrow
16h 19m
2 stops
STL16:49Lambert-St Louis
4 Dec
STL11:40Lambert-St Louis
15h 05m
2 stops
LHR08:45London Heathrow
£578
Find similar
Delta
20 Feb
LHR11:45London Heathrow
17h 55m
2 stops
STL23:40Lambert-St Louis
25 Feb
STL08:50Lambert-St Louis
17h 15m
2 stops
LHR08:05London Heathrow
£589
Find similar

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 31 October 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

Wed 26/11

11:55-19:30

1 stop13h 35m

Lambert-St Louis

Wed 3/12

15:59-10:00

1 stop12h 01m

£548

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 8/12

17:35-21:57

2 stops34h 22m

Lambert-St Louis

Tue 23/12

19:02-07:50

1 stop30h 48m

£549

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 8/12

11:45-18:43

1 stop12h 58m

Lambert-St Louis

Tue 23/12

11:41-10:00

1 stop16h 19m

£549

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/12

11:45-20:47

2 stops15h 02m

Lambert-St Louis

Wed 10/12

14:02-07:50

1 stop11h 48m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

10:05-19:29

1 stop15h 24m

Lambert-St Louis

Fri 23/1

18:02-12:20

1 stop12h 18m

£556

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

18:10-19:29

2 stops31h 19m

Lambert-St Louis

Fri 23/1

11:55-11:40

1 stop17h 45m

£559

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 5/3

15:00-22:57

1 stop13h 57m

Lambert-St Louis

Mon 9/3

16:43-11:35

1 stop13h 52m

£580

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 5/3

11:55-19:26

1 stop13h 31m

Lambert-St Louis

Mon 9/3

14:36-07:20

1 stop11h 44m

£585

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

11:45-20:46

2 stops15h 01m

Lambert-St Louis

Mon 1/12

17:17-11:40

1 stop12h 23m

£596

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 8/1

10:45-09:03

2 stops28h 18m

Lambert-St Louis

Fri 16/1

09:34-06:50

1 stop15h 16m

£614

Flights are sorted by cheapest return 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?

The month of February is, on average, the cheapest month to fly to St. Louis from London Heathrow Airport, with most prices found around £617. If you’re not able to fly to St. Louis in February, then March is your next best option. Flight prices from London Heathrow Airport to St. Louis during March average around £650.

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

Our data shows that Sunday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £464. Flights from London Heathrow Airport to St. Louis on a Saturday will generally be more expensive and average around £698. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our data shows that the cheapest London Heathrow Airport to St. Louis flights are usually those with departure times in the afternoon. Our users have found flights to St. Louis in the afternoon for as low as £464. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £671.

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 £742 when searching weeks before you fly. 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 £664 on momondo.

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

There is only 1 cabin class 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 27% 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 October 2025, prices for London Heathrow Airport to St. Louis flights are approximately 19% 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 return 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

£464

Direct flights

None
The best flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is £464
There are no direct flights from London Heathrow Airport to St. Louis. Popular non-direct route for this connection is London Heathrow Airport - Lambert-St Louis Airport.
Search flight deals

  • How far is London Heathrow to Lambert-St Louis by plane?

    The distance between London Heathrow and Lambert-St Louis is about 4185.8 mi. A reasonable flight in good conditions will take 12h 58m.

  • 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 travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • 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 £89Free CancellationRating
7.2
11,034 reviews
Search American Airlines flights
Scandinavian AirlinesPriceFrom £488Free CancellationRating
7.4
1,548 reviews
Search Scandinavian Airlines flights
KLMPriceFrom £512Free CancellationRating
7.7
1,406 reviews
Search KLM flights
FinnairPriceFrom £518Free CancellationRating
7.6
1,333 reviews
Search Finnair flights
Air CanadaPriceFrom £616Free CancellationRating
7.1
10,383 reviews
Search Air Canada flights
British AirwaysPriceFrom £622Free CancellationRating
6.7
7,488 reviews
Search British Airways flights
United AirlinesPriceFrom £637Free CancellationRating
7.4
8,999 reviews
Search United Airlines flights
IberiaPriceFrom £637Free CancellationRating
7.0
3,004 reviews
Search Iberia flights
LufthansaPriceFrom £705Free CancellationRating
6.8
7,542 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom £709Free CancellationRating
7.5
671 reviews
Search Virgin Atlantic flights

Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Collinsville

Why use momondo?

Why should I use momondo to find a flight deal from London to St. Louis?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to St. Louis for 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?

momondo provides multiple filters to help you find the best flight to St. Louis from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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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