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Cheap flights from London Heathrow Airport to St. Louis from £371

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 5/5. 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
1 adult, Economy, 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
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£512British Airways
Wed, 13 May - Wed, 27 May
Delta Logo
09:20 - 17:46
LHR
-
STL
14h 26m
1 stop
Delta Logo
13:59 - 07:10
STL
-
LHR
11h 11m
1 stop
£515Delta
Wed, 13 May - Mon, 25 May
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£533British Airways
Fri, 15 May - Wed, 27 May
Delta Logo
09:20 - 17:56
LHR
-
STL
14h 36m
1 stop
Delta Logo
10:19 - 07:10
STL
-
LHR
14h 51m
1 stop
£538Delta
Fri, 15 May - Mon, 25 May
British Airways Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
British Airways Logo
21:35 - 11:35
STL
-
LHR
8h 00mdirect
£541British Airways
Tue, 19 May - Wed, 27 May
Delta Logo
13:25 - 23:59
LHR
-
STL
16h 34m
1 stop
Delta Logo
13:59 - 07:10
STL
-
LHR
11h 11m
1 stop
£542Delta
Wed, 13 May - Tue, 26 May
Delta Logo
10:45 - 17:30
LHR
-
STL
12h 45m
1 stop
Delta Logo
10:19 - 07:10
STL
-
LHR
14h 51m
1 stop
£560Delta
Mon, 18 May - Mon, 25 May
Finnair Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
Finnair Logo
16:47 - 09:25
STL
-
LHR
10h 38m
1 stop
£564Finnair
Wed, 2 Sep - Wed, 23 Sep
Finnair Logo
16:25 - 19:30
LHR
-
STL
9h 05mdirect
Finnair Logo
09:10 - 06:55
STL
-
LHR
15h 45m
1 stop
£567Finnair
Tue, 21 Apr - Mon, 27 Apr
Finnair Logo
15:00 - 23:55
LHR
-
STL
14h 55m
1 stop
Finnair Logo
18:55 - 06:25
STL
-
LHR
29h 30m
2 stops
£569Finnair
Wed, 2 Sep - Wed, 23 Sep

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
20 Apr
LHR13:25London Heathrow
34h 19m
1 stop
STL17:44Lambert-St Louis
30 Apr
STL13:46Lambert-St Louis
11h 24m
1 stop
LHR07:10London Heathrow
£572
Virgin Atlantic
2 Sept
LHR06:30London Heathrow
22h 31m
2 stops
STL23:01Lambert-St Louis
23 Sept
STL15:50Lambert-St Louis
16h 45m
2 stops
LHR14:35London Heathrow
£587
Virgin Atlantic
13 Apr
LHR19:45London Heathrow
33h 29m
2 stops
STL23:14Lambert-St Louis
20 Apr
STL16:41Lambert-St Louis
37h 24m
2 stops
LHR12:05London Heathrow
£601

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
13 May
LHR16:25London Heathrow
9h 05m
STL19:30Lambert-St Louis
27 May
STL21:35Lambert-St Louis
8h 00m
LHR11:35London Heathrow
£512
British Airways
15 May
LHR16:25London Heathrow
9h 05m
STL19:30Lambert-St Louis
27 May
STL21:35Lambert-St Louis
8h 00m
LHR11:35London Heathrow
£533
British Airways
19 May
LHR16:25London Heathrow
9h 05m
STL19:30Lambert-St Louis
27 May
STL21:35Lambert-St Louis
8h 00m
LHR11:35London Heathrow
£541

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 19 March 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

Cheapest return flight
Fastest return journey

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 13/5

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Wed 27/5

21:35-11:35

Nonstop8h 00m

£512

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 13/5

09:20-17:46

1 stop14h 26m

Lambert-St Louis

Mon 25/5

13:59-07:10

1 stop11h 11m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 15/5

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Wed 27/5

21:35-11:35

Nonstop8h 00m

£533

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 15/5

09:20-17:56

1 stop14h 36m

Lambert-St Louis

Mon 25/5

10:19-07:10

1 stop14h 51m

£538

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 19/5

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Wed 27/5

21:35-11:35

Nonstop8h 00m

£541

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 13/5

13:25-23:59

1 stop16h 34m

Lambert-St Louis

Tue 26/5

13:59-07:10

1 stop11h 11m

£542

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 18/5

10:45-17:30

1 stop12h 45m

Lambert-St Louis

Mon 25/5

10:19-07:10

1 stop14h 51m

£560

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 2/9

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Wed 23/9

16:47-09:25

1 stop10h 38m

£564

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 21/4

16:25-19:30

Nonstop9h 05m

Lambert-St Louis

Mon 27/4

09:10-06:55

1 stop15h 45m

£567

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 2/9

15:00-23:55

1 stop14h 55m

Lambert-St Louis

Wed 23/9

18:55-06:25

2 stops29h 30m

£569

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 £557. 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 £705.

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 £599. Flights from London Heathrow Airport to St. Louis on a Tuesday will generally be more expensive and average around £709. 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 £741 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 £652 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 March 2026, prices for London Heathrow Airport to St. Louis flights are approximately 24% cheaper 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

£1,835

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 £1,835. The best return flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is £735.
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. Airline offering direct flights is American Airlines..
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 £175Free CancellationRating
7.1
11,480 reviews
Search American Airlines flights
United AirlinesPriceFrom £476Free CancellationRating
7.4
9,444 reviews
Search United Airlines flights
British AirwaysPriceFrom £481Free CancellationRating
6.7
7,803 reviews
Search British Airways flights
KLMPriceFrom £523Free CancellationRating
7.8
1,472 reviews
Search KLM flights
Virgin AtlanticPriceFrom £559Free CancellationRating
7.5
682 reviews
Search Virgin Atlantic flights
Air CanadaPriceFrom £606Free CancellationRating
7.1
10,817 reviews
Search Air Canada flights
FinnairPriceFrom £610Free CancellationRating
7.7
1,374 reviews
Search Finnair flights
IberiaPriceFrom £661Free CancellationRating
7.0
3,144 reviews
Search Iberia flights
LufthansaPriceFrom £664Free CancellationRating
6.8
7,857 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

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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