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Cheap flights from London Heathrow Airport to St. Louis from £399

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 30/10. 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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0 bags

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Find the cheapest flights from London Heathrow Airport to St. Louis

Cheap return flights

Scandinavian Airlines Logo
06:40 - 21:58LHR-STL
21h 18m2 stops
Scandinavian Airlines Logo
13:55 - 18:30STL-LHR
22h 35m2 stops
£590Scandinavian Airlines
Find Deal
Mon, 24 Nov - Mon, 1 Dec
Scandinavian Airlines Logo
07:05 - 23:40LHR-STL
22h 35m3 stops
Scandinavian Airlines Logo
11:40 - 16:00STL-LHR
22h 20m2 stops
£593Scandinavian Airlines
Find Deal
Thu, 20 Nov - Mon, 8 Dec
Scandinavian Airlines Logo
21:05 - 22:04LHR-STL
29h 59m3 stops
Scandinavian Airlines Logo
15:59 - 16:00STL-LHR
18h 01m2 stops
£603Scandinavian Airlines
Find Deal
Fri, 31 Oct - Fri, 7 Nov
Lufthansa Logo
06:30 - 14:55LHR-STL
13h 25m1 stop
Lufthansa Logo
12:31 - 05:55STL-LHR
11h 24m1 stop
£621Lufthansa
Find Deal
Wed, 29 Oct - Wed, 5 Nov
Lufthansa Logo
06:30 - 13:55LHR-STL
13h 25m1 stop
Lufthansa Logo
12:31 - 05:55STL-LHR
11h 24m1 stop
£628Lufthansa
Find Deal
Wed, 26 Nov - Sun, 30 Nov
Finnair Logo
11:45 - 18:25LHR-STL
12h 40m1 stop
Finnair Logo
06:00 - 07:50STL-LHR
19h 50m1 stop
£645Finnair
Find Deal
Mon, 24 Nov - Mon, 1 Dec
Finnair Logo
11:15 - 22:34LHR-STL
17h 19m1 stop
Finnair Logo
11:42 - 06:50STL-LHR
13h 08m1 stop
£646Finnair
Find Deal
Mon, 24 Nov - Mon, 1 Dec
British Airways Logo
11:45 - 19:07LHR-STL
13h 22m1 stop
British Airways Logo
14:36 - 07:20STL-LHR
10h 44m1 stop
£667British Airways
Find Deal
Mon, 12 Jan - Mon, 26 Jan
Iberia Logo
18:45 - 19:06LHR-STL
30h 21m2 stops
Iberia Logo
13:55 - 08:15STL-LHR
12h 20m1 stop
£680Iberia
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Sun, 7 Dec - Thu, 18 Dec
British Airways Logo
14:45 - 21:52LHR-STL
13h 07m1 stop
British Airways Logo
13:55 - 08:35STL-LHR
12h 40m1 stop
£693British Airways
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Sun, 7 Dec - Thu, 18 Dec

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
7 Oct
LHR11:20London Heathrow
12h 42m
1 stop
STL18:02Lambert-St Louis
22 Oct
STL14:15Lambert-St Louis
14h 15m
2 stops
LHR10:30London Heathrow
£641
Find similar
Virgin Atlantic
12 Jan
LHR20:25London Heathrow
32h 45m
2 stops
STL23:10Lambert-St Louis
26 Jan
STL11:51Lambert-St Louis
13h 59m
1 stop
LHR07:50London Heathrow
£642
Find similar
Virgin Atlantic
7 Oct
LHR11:20London Heathrow
12h 42m
1 stop
STL18:02Lambert-St Louis
22 Oct
STL14:15Lambert-St Louis
14h 15m
2 stops
LHR10:30London Heathrow
£642
Find similar

Lufthansa flights from London Heathrow Airport to St. Louis

Our best Lufthansa deals on London Heathrow Airport to St. Louis flight tickets
Lufthansa
29 Oct
LHR06:30London Heathrow
13h 25m
1 stop
STL14:55Lambert-St Louis
5 Nov
STL12:31Lambert-St Louis
11h 24m
1 stop
LHR05:55London Heathrow
£621
Find similar
Lufthansa
26 Nov
LHR06:30London Heathrow
13h 25m
1 stop
STL13:55Lambert-St Louis
30 Nov
STL12:31Lambert-St Louis
11h 24m
1 stop
LHR05:55London Heathrow
£628
Find similar
Lufthansa
19 Nov
LHR06:30London Heathrow
13h 25m
1 stop
STL13:55Lambert-St Louis
5 Dec
STL13:00Lambert-St Louis
10h 55m
1 stop
LHR05:55London Heathrow
£631
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 17 September 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 24/11

06:40-21:58

2 stops21h 18m

Lambert-St Louis

Mon 1/12

13:55-18:30

2 stops22h 35m

£590

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 20/11

07:05-23:40

3 stops22h 35m

Lambert-St Louis

Mon 8/12

11:40-16:00

2 stops22h 20m

£593

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 31/10

21:05-22:04

3 stops29h 59m

Lambert-St Louis

Fri 7/11

15:59-16:00

2 stops18h 01m

£603

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 29/10

06:30-14:55

1 stop13h 25m

Lambert-St Louis

Wed 5/11

12:31-05:55

1 stop11h 24m

£621

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 26/11

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Sun 30/11

12:31-05:55

1 stop11h 24m

£628

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

11:45-18:25

1 stop12h 40m

Lambert-St Louis

Mon 1/12

06:00-07:50

1 stop19h 50m

£645

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 24/11

11:15-22:34

1 stop17h 19m

Lambert-St Louis

Mon 1/12

11:42-06:50

1 stop13h 08m

£646

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 12/1

11:45-19:07

1 stop13h 22m

Lambert-St Louis

Mon 26/1

14:36-07:20

1 stop10h 44m

£666

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 7/12

18:45-19:06

2 stops30h 21m

Lambert-St Louis

Thu 18/12

13:55-08:15

1 stop12h 20m

£680

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 7/12

14:45-21:52

1 stop13h 07m

Lambert-St Louis

Thu 18/12

13:55-08:35

1 stop12h 40m

£693

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 typical price of a round-trip flight between London Heathrow Airport and St. Louis?

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 £598. 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 £628.

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 £592. Flights from London Heathrow Airport to St. Louis on a Sunday will generally be more expensive and average around £705. 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 £551. In contrast, the most expensive time of day to depart to St. Louis is in the morning when prices are around £649.

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 £713 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 £645 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 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

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 distance between London Heathrow and Lambert-St Louis is about 4185.8 mi. A reasonable flight in good conditions will take 12h 40m.

  • 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 £86Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Scandinavian AirlinesPriceFrom £471Free CancellationRating
7.4
1,486 reviews
Search Scandinavian Airlines flights
FinnairPriceFrom £501Free CancellationRating
7.6
1,324 reviews
Search Finnair flights
Air CanadaPriceFrom £595Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom £605Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights
IberiaPriceFrom £616Free CancellationRating
7.0
2,924 reviews
Search Iberia flights
British AirwaysPriceFrom £621Free CancellationRating
6.7
7,363 reviews
Search British Airways flights
LufthansaPriceFrom £663Free CancellationRating
6.8
7,407 reviews
Search Lufthansa flights
Virgin AtlanticPriceFrom £664Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
KLMPriceFrom £706Free CancellationRating
7.8
1,386 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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