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Cheap flights from London Heathrow Airport to St. Louis from £373

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 18/9. 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

Delta Logo
16:05 - 16:43LHR-STL
30h 38m1 stop
Delta Logo
16:10 - 10:15STL-LHR
12h 05m1 stop
£605Delta
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Mo, 6 Okt - Mo, 13 Okt
Delta Logo
09:35 - 16:43LHR-STL
13h 08m1 stop
Delta Logo
09:31 - 06:45STL-LHR
15h 14m2 stops
£609Delta
Find Deal
Di, 7 Okt - Di, 14 Okt
Air Canada Logo
14:05 - 19:57LHR-STL
11h 52m1 stop
Air Canada Logo
13:30 - 06:30STL-LHR
11h 00m1 stop
£611Air Canada
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Di, 7 Okt - Di, 14 Okt
Lufthansa Logo
06:30 - 13:55LHR-STL
13h 25m1 stop
Lufthansa Logo
18:43 - 11:15STL-LHR
10h 32m1 stop
£691Lufthansa
Find Deal
Mi, 26 Nov - So, 30 Nov
United Airlines Logo
09:00 - 21:32LHR-STL
18h 32m2 stops
United Airlines Logo
17:30 - 11:45STL-LHR
12h 15m1 stop
£699United Airlines
Find Deal
Sa, 30 Aug - Fr, 12 Sep
United Airlines Logo
08:30 - 18:59LHR-STL
16h 29m2 stops
United Airlines Logo
16:40 - 12:20STL-LHR
13h 40m1 stop
£700United Airlines
Find Deal
Mo, 15 Sep - Mo, 22 Sep
Finnair Logo
12:15 - 19:22LHR-STL
13h 07m1 stop
Finnair Logo
16:55 - 10:20STL-LHR
11h 25m1 stop
£701Finnair
Find Deal
Mo, 15 Sep - Mo, 22 Sep
Virgin Atlantic Logo
09:55 - 23:09LHR-STL
19h 14m2 stops
Virgin Atlantic Logo
15:55 - 07:15STL-LHR
33h 20m1 stop
£728Virgin Atlantic
Find Deal
Mi, 17 Sep - Sa, 20 Sep
Virgin Atlantic Logo
15:15 - 22:00LHR-STL
12h 45m1 stop
Virgin Atlantic Logo
17:11 - 07:15STL-LHR
32h 04m1 stop
£742Virgin Atlantic
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Mi, 17 Sep - Sa, 20 Sep
Finnair Logo
12:30 - 20:14LHR-STL
13h 44m1 stop
Finnair Logo
18:28 - 21:40STL-LHR
21h 12m2 stops
£786Finnair
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Mi, 15 Okt - So, 19 Okt

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
27 Aug
LHR06:40London Heathrow
21h 22m
2 stops
STL22:02Lambert-St Louis
3 Sept
STL13:26Lambert-St Louis
20h 34m
2 stops
LHR16:00London Heathrow
£628
Find similar
Scandinavian Airlines
16 Oct
LHR18:40London Heathrow
35h 01m
2 stops
STL23:41Lambert-St Louis
21 Oct
STL15:59Lambert-St Louis
19h 41m
2 stops
LHR17:40London Heathrow
£635
Find similar
Scandinavian Airlines
30 Aug
LHR17:00London Heathrow
35h 02m
2 stops
STL22:02Lambert-St Louis
12 Sept
STL13:26Lambert-St Louis
20h 34m
2 stops
LHR16:00London Heathrow
£637
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
30 Aug
LHR09:00London Heathrow
18h 32m
2 stops
STL21:32Lambert-St Louis
12 Sept
STL17:30Lambert-St Louis
12h 15m
1 stop
LHR11:45London Heathrow
£699
Find similar
United Airlines
15 Sept
LHR08:30London Heathrow
16h 29m
2 stops
STL18:59Lambert-St Louis
22 Sept
STL16:40Lambert-St Louis
13h 40m
1 stop
LHR12:20London Heathrow
£700
Find similar
United Airlines
10 Sept
LHR06:30London Heathrow
13h 00m
1 stop
STL13:30Lambert-St Louis
22 Sept
STL09:17Lambert-St Louis
15h 03m
1 stop
LHR06:20London Heathrow
£702
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 1 August 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

Mo 6/10

16:05-16:43

1 stop30h 38m

Lambert-St Louis

Mo 13/10

16:10-10:15

1 stop12h 05m

£605

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Di 7/10

09:35-16:43

1 stop13h 08m

Lambert-St Louis

Di 14/10

09:31-06:45

2 stops15h 14m

£609

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Di 7/10

14:05-19:57

1 stop11h 52m

Lambert-St Louis

Di 14/10

13:30-06:30

1 stop11h 00m

£611

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mi 26/11

06:30-13:55

1 stop13h 25m

Lambert-St Louis

So 30/11

18:43-11:15

1 stop10h 32m

£691

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sa 30/8

09:00-21:32

2 stops18h 32m

Lambert-St Louis

Fr 12/9

17:30-11:45

1 stop12h 15m

£699

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mo 15/9

08:30-18:59

2 stops16h 29m

Lambert-St Louis

Mo 22/9

16:40-12:20

1 stop13h 40m

£700

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mo 15/9

12:15-19:22

1 stop13h 07m

Lambert-St Louis

Mo 22/9

16:55-10:20

1 stop11h 25m

£701

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mi 17/9

09:55-23:09

2 stops19h 14m

Lambert-St Louis

Sa 20/9

15:55-07:15

1 stop33h 20m

£728

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mi 17/9

15:15-22:00

1 stop12h 45m

Lambert-St Louis

Sa 20/9

17:11-07:15

1 stop32h 04m

£742

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mi 15/10

12:30-20:14

1 stop13h 44m

Lambert-St Louis

So 19/10

18:28-21:40

2 stops21h 12m

£786

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 £614. If you’re not able to fly to St. Louis in February, then January is your next best option. Flight prices from London Heathrow Airport to St. Louis during January average around £645.

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

Our data shows that Wednesday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £610. Flights from London Heathrow Airport to St. Louis on a Sunday will generally be more expensive and average around £726. 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 evening. Our users have found flights to St. Louis in the evening for as low as £568. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £668.

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 £734 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 £661 on momondo.

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

You could potentially save up to 8% 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 August 2025, prices for London Heathrow Airport to St. Louis flights are approximately 10% 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

£373

Fastest flight time

11h 52m

Direct flights

None

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from London Heathrow Airport in the past 72 hours is £373. The best return flight deal from London Heathrow Airport to St. Louis found on momondo in the last 72 hours is £605.
The fastest flight from London Heathrow Airport to St. Louis takes 11h 52m
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.
There is 1 airport near St. Louis: 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 11h 52m.

  • 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 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 £176Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Scandinavian AirlinesPriceFrom £486Free CancellationRating
7.3
1,457 reviews
Search Scandinavian Airlines flights
FinnairPriceFrom £517Free CancellationRating
7.6
1,316 reviews
Search Finnair flights
Air CanadaPriceFrom £631Free CancellationRating
7.1
9,851 reviews
Search Air Canada flights
IberiaPriceFrom £635Free CancellationRating
7.0
2,859 reviews
Search Iberia flights
British AirwaysPriceFrom £638Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
Virgin AtlanticPriceFrom £644Free CancellationRating
7.4
655 reviews
Search Virgin Atlantic flights
United AirlinesPriceFrom £649Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
LufthansaPriceFrom £687Free CancellationRating
6.8
7,275 reviews
Search Lufthansa flights
KLMPriceFrom £727Free CancellationRating
7.8
1,383 reviews
Search KLM 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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