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Cheap flights from London Heathrow Airport to St. Louis from £348

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 15/4. 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.
Virgin Atlantic Logo
13:00 - 20:43
LHR
-
STL
13h 43m
1 stop
Virgin Atlantic Logo
13:39 - 10:15
STL
-
LHR
15h 36m
2 stops
£521Virgin Atlantic
Mon, 2 Mar - Mon, 16 Mar
British Airways Logo
09:55 - 18:52
LHR
-
STL
13h 57m
1 stop
British Airways Logo
14:06 - 07:20
STL
-
LHR
12h 14m
1 stop
£529British Airways
Tue, 17 Mar - Tue, 24 Mar
Finnair Logo
09:55 - 18:07
LHR
-
STL
13h 12m
1 stop
Finnair Logo
10:33 - 07:00
STL
-
LHR
15h 27m
2 stops
£536Finnair
Wed, 18 Mar - Wed, 25 Mar
Finnair Logo
15:35 - 11:29
LHR
-
STL
24h 54m
2 stops
Finnair Logo
18:37 - 10:25
STL
-
LHR
10h 48m
1 stop
£537Finnair
Tue, 17 Mar - Tue, 24 Mar
Virgin Atlantic Logo
09:20 - 17:44
LHR
-
STL
14h 24m
1 stop
Virgin Atlantic Logo
18:04 - 07:10
STL
-
LHR
31h 06m
1 stop
£548Virgin Atlantic
Mon, 4 May - Sun, 10 May
Delta Logo
08:40 - 23:25
LHR
-
STL
19h 45m
2 stops
Delta Logo
12:04 - 06:25
STL
-
LHR
13h 21m
1 stop
£550Delta
Wed, 18 Mar - Wed, 25 Mar
British Airways Logo
09:55 - 19:30
LHR
-
STL
14h 35m
1 stop
British Airways Logo
16:13 - 10:00
STL
-
LHR
12h 47m
1 stop
£551British Airways
Wed, 18 Mar - Wed, 25 Mar
Virgin Atlantic Logo
06:30 - 17:53
LHR
-
STL
16h 23m
2 stops
Virgin Atlantic Logo
12:28 - 08:45
STL
-
LHR
15h 17m
2 stops
£552Virgin Atlantic
Tue, 17 Mar - Tue, 24 Mar
Delta Logo
09:55 - 21:14
LHR
-
STL
17h 19m
2 stops
Delta Logo
10:43 - 06:25
STL
-
LHR
13h 42m
1 stop
£561Delta
Mon, 11 May - Thu, 14 May
Delta Logo
09:55 - 20:42
LHR
-
STL
16h 47m
2 stops
Delta Logo
18:57 - 14:35
STL
-
LHR
13h 38m
2 stops
£563Delta
Mon, 20 Apr - Wed, 13 May

Delta flights from London Heathrow Airport to St. Louis

Our best Delta deals on London Heathrow Airport to St. Louis flight tickets
Delta
18 Mar
LHR08:40London Heathrow
19h 45m
2 stops
STL23:25Lambert-St Louis
25 Mar
STL12:04Lambert-St Louis
13h 21m
1 stop
LHR06:25London Heathrow
£550
Delta
11 May
LHR09:55London Heathrow
17h 19m
2 stops
STL21:14Lambert-St Louis
14 May
STL10:43Lambert-St Louis
13h 42m
1 stop
LHR06:25London Heathrow
£561
Delta
20 Apr
LHR09:55London Heathrow
16h 47m
2 stops
STL20:42Lambert-St Louis
13 May
STL18:57Lambert-St Louis
13h 38m
2 stops
LHR14:35London Heathrow
£563

American Airlines flights from London Heathrow Airport to St. Louis

Our best American Airlines deals on London Heathrow Airport to St. Louis flight tickets
American Airlines
19 Mar
LHR13:10London Heathrow
14h 40m
1 stop
STL22:50Lambert-St Louis
26 Mar
STL11:59Lambert-St Louis
13h 31m
1 stop
LHR06:30London Heathrow
£587
American Airlines
18 Feb
LHR09:55London Heathrow
13h 03m
1 stop
STL16:58Lambert-St Louis
17 Mar
STL16:13Lambert-St Louis
12h 47m
1 stop
LHR10:00London Heathrow
£589
American Airlines
4 May
LHR09:45London Heathrow
14h 42m
1 stop
STL18:27Lambert-St Louis
10 May
STL21:40Lambert-St Louis
8h 00m
LHR11:40London Heathrow
£693

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 2 February 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

Mon 2/3

13:00-20:43

1 stop13h 43m

Lambert-St Louis

Mon 16/3

13:39-10:15

2 stops15h 36m

£521

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

09:55-18:52

1 stop13h 57m

Lambert-St Louis

Tue 24/3

14:06-07:20

1 stop12h 14m

£529

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

09:55-18:07

1 stop13h 12m

Lambert-St Louis

Wed 25/3

10:33-07:00

2 stops15h 27m

£536

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

15:35-11:29

2 stops24h 54m

Lambert-St Louis

Tue 24/3

18:37-10:25

1 stop10h 48m

£537

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/5

09:20-17:44

1 stop14h 24m

Lambert-St Louis

Sun 10/5

18:04-07:10

1 stop31h 06m

£548

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

08:40-23:25

2 stops19h 45m

Lambert-St Louis

Wed 25/3

12:04-06:25

1 stop13h 21m

£550

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

09:55-19:30

1 stop14h 35m

Lambert-St Louis

Wed 25/3

16:13-10:00

1 stop12h 47m

£551

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 17/3

06:30-17:53

2 stops16h 23m

Lambert-St Louis

Tue 24/3

12:28-08:45

2 stops15h 17m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 11/5

09:55-21:14

2 stops17h 19m

Lambert-St Louis

Thu 14/5

10:43-06:25

1 stop13h 42m

£561

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

09:55-20:42

2 stops16h 47m

Lambert-St Louis

Wed 13/5

18:57-14:35

2 stops13h 38m

£563

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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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 £551. 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 £635.

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

Our data shows that Saturday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £583. Flights from London Heathrow Airport to St. Louis on a Tuesday will generally be more expensive and average around £691. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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 £712 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 £598 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 21% 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 February 2026, prices for London Heathrow Airport to St. Louis flights are approximately 8% 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

£566

Fastest flight time

9h 05m

Direct flights

Mon, Wed, Thu and Sat

Airports in St. Louis

1 airport
The best flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is £566
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 distance between London Heathrow and Lambert-St Louis is about 4185.8 mi. A reasonable flight in good conditions will take 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 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 £167Free CancellationRating
7.2
11,212 reviews
Search American Airlines flights
United AirlinesPriceFrom £463Free CancellationRating
7.4
9,229 reviews
Search United Airlines flights
British AirwaysPriceFrom £468Free CancellationRating
6.7
7,709 reviews
Search British Airways flights
KLMPriceFrom £493Free CancellationRating
7.7
1,448 reviews
Search KLM flights
FinnairPriceFrom £498Free CancellationRating
7.6
1,357 reviews
Search Finnair flights
Virgin AtlanticPriceFrom £544Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
Air CanadaPriceFrom £590Free CancellationRating
7.1
10,673 reviews
Search Air Canada flights
IberiaPriceFrom £641Free CancellationRating
7.0
3,101 reviews
Search Iberia flights
LufthansaPriceFrom £646Free CancellationRating
6.8
7,758 reviews
Search Lufthansa flights

Travelling to a place near St. Louis?

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

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.

An easier way to manage your St. Louis trip

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