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Cheap flights from St. Louis to London from £212

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to London departing on 23/2. 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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Cheap return flights

Enter your travel dates to find the best prices.
KLM Logo
11:55 - 07:50
STL
-
LHR
13h 55m
1 stop
KLM Logo
20:25 - 16:32
LHR
-
STL
25h 07m
2 stops
£460KLM
Mon, 2 Mar - Mon, 9 Mar
Lufthansa Logo
18:55 - 18:35
STL
-
LHR
17h 40m
2 stops
Lufthansa Logo
06:30 - 18:00
LHR
-
STL
16h 30m
2 stops
£462Lufthansa
Sun, 1 Mar - Fri, 13 Mar
Lufthansa Logo
18:55 - 11:15
STL
-
LHR
10h 20m
1 stop
Lufthansa Logo
06:30 - 13:55
LHR
-
STL
13h 25m
1 stop
£465Lufthansa
Mon, 23 Feb - Wed, 4 Mar
Lufthansa Logo
18:35 - 18:25
STL
-
LHR
17h 50m
2 stops
Lufthansa Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£466Lufthansa
Mon, 30 Mar - Fri, 10 Apr
Multiple Airlines Logo
07:41 - 07:10
STL
-
LHR
17h 29m
2 stops
Multiple Airlines Logo
06:30 - 13:55
LHR
-
STL
13h 25m
1 stop
£467Multiple Airlines
Mon, 23 Feb - Wed, 4 Mar
Virgin Atlantic Logo
18:47 - 11:40
STL
-
LHR
10h 53m
1 stop
Virgin Atlantic Logo
15:50 - 23:36
LHR
-
STL
13h 46m
1 stop
£468Virgin Atlantic
Mon, 23 Feb - Wed, 4 Mar
Multiple Airlines Logo
16:05 - 09:35
STL
-
LHR
11h 30m
1 stop
Multiple Airlines Logo
06:30 - 13:25
LHR
-
STL
12h 55m
1 stop
£468Multiple Airlines
Wed, 1 Apr - Wed, 8 Apr
United Airlines Logo
09:55 - 05:55
STL
-
LHR
14h 00m
1 stop
United Airlines Logo
06:50 - 16:02
LHR
-
STL
15h 12m
2 stops
£469United Airlines
Tue, 24 Feb - Tue, 3 Mar
Multiple Airlines Logo
08:17 - 07:10
STL
-
LHR
16h 53m
2 stops
Multiple Airlines Logo
06:30 - 13:55
LHR
-
STL
13h 25m
1 stop
£470Multiple Airlines
Mon, 23 Feb - Wed, 4 Mar
United Airlines Logo
13:11 - 07:55
STL
-
LHR
12h 44m
1 stop
United Airlines Logo
06:50 - 19:13
LHR
-
STL
18h 23m
2 stops
£471United Airlines
Mon, 23 Feb - Thu, 5 Mar

Virgin Atlantic flights from St. Louis to London Heathrow Airport

Our best Virgin Atlantic deals on St. Louis to London Heathrow Airport flight tickets
Virgin Atlantic
23 Feb
STL18:47Lambert-St Louis
10h 53m
1 stop
LHR11:40London Heathrow
4 Mar
LHR15:50London Heathrow
13h 46m
1 stop
STL23:36Lambert-St Louis
£468
Virgin Atlantic
23 Feb
STL10:13Lambert-St Louis
14h 37m
2 stops
LHR06:50London Heathrow
4 Mar
LHR10:00London Heathrow
16h 43m
2 stops
STL20:43Lambert-St Louis
£473
Virgin Atlantic
3 Mar
STL11:55Lambert-St Louis
12h 30m
1 stop
LHR06:25London Heathrow
10 Mar
LHR13:00London Heathrow
12h 42m
1 stop
STL20:42Lambert-St Louis
£477

United Airlines flights from St. Louis to London Heathrow Airport

Our best United Airlines deals on St. Louis to London Heathrow Airport flight tickets
United Airlines
24 Feb
STL09:55Lambert-St Louis
14h 00m
1 stop
LHR05:55London Heathrow
3 Mar
LHR06:50London Heathrow
15h 12m
2 stops
STL16:02Lambert-St Louis
£469
United Airlines
10 Feb
STL11:22Lambert-St Louis
12h 58m
1 stop
LHR06:20London Heathrow
3 Mar
LHR06:50London Heathrow
19h 33m
2 stops
STL20:23Lambert-St Louis
£471
United Airlines
10 Feb
STL09:57Lambert-St Louis
15h 13m
2 stops
LHR07:10London Heathrow
3 Mar
LHR06:50London Heathrow
19h 33m
2 stops
STL20:23Lambert-St Louis
£473

momondo Fare Finder

 
Customise your flight search to find flights from St. Louis to London Heathrow Airport 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 4 February 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/3

11:55-07:50

1 stop13h 55m

London Heathrow

Mon 9/3

20:25-16:32

2 stops25h 07m

£460

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 1/3

18:55-18:35

2 stops17h 40m

London Heathrow

Fri 13/3

06:30-18:00

2 stops16h 30m

£462

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 23/2

18:55-11:15

1 stop10h 20m

London Heathrow

Wed 4/3

06:30-13:55

1 stop13h 25m

£465

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 30/3

18:35-18:25

2 stops17h 50m

London Heathrow

Fri 10/4

06:30-13:25

1 stop12h 55m

£466

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 23/2

07:41-07:10

2 stops17h 29m

London Heathrow

Wed 4/3

06:30-13:55

1 stop13h 25m

£467

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 23/2

18:47-11:40

1 stop10h 53m

London Heathrow

Wed 4/3

15:50-23:36

1 stop13h 46m

£468

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 1/4

16:05-09:35

1 stop11h 30m

London Heathrow

Wed 8/4

06:30-13:25

1 stop12h 55m

£468

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 24/2

09:55-05:55

1 stop14h 00m

London Heathrow

Tue 3/3

06:50-16:02

2 stops15h 12m

£469

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 23/2

08:17-07:10

2 stops16h 53m

London Heathrow

Wed 4/3

06:30-13:55

1 stop13h 25m

£470

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 23/2

13:11-07:55

1 stop12h 44m

London Heathrow

Thu 5/3

06:50-19:13

2 stops18h 23m

£471

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 London from

How to get the cheapest flight ticket from St. Louis to London Heathrow Airport

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 St. Louis and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

In general, October is the cheapest month to fly from St. Louis to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £495. The month of November is another great option to travel to London Heathrow Airport, with average flight prices from St. Louis averaging around £518.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as £785. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Sunday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Sunday is £848.

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £630 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from St. Louis for as low as £561 on momondo.

How have St. Louis to London Heathrow Airport flight prices changed over time?

As of February 2026, prices for St. Louis to London Heathrow Airport flights are approximately 14% cheaper when compared to flights at the same time last year.

When to book flights from St. Louis to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap St. Louis to London Heathrow Airport (STL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to London Heathrow Airport

Best price found

£572

Fastest flight time

8h 00m

Direct flights

Mon, Wed, Thu and Sat
The best flight deal from St. Louis to London Heathrow Airport found on momondo in the last 72 hours is £572
The fastest flight from St. Louis to London Heathrow Airport takes 8h 00m
Direct flights go from St. Louis to London Heathrow Airport on Monday, Wednesday, Thursday and Saturday. There are no airlines offering direct flights..
Search flight deals

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

    Lambert-St Louis and London Heathrow are 4185.8 mi apart from one another. By plane, this route typically takes 8h 00m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to London Heathrow Airport?

    Prices for flights from Lambert-St Louis Airport to London Heathrow Airport were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to London Heathrow Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to London Heathrow Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from St. Louis to London Heathrow Airport?

  • What is the most popular airline from St. Louis to London Heathrow Airport?

Best airlines flying from St. Louis to London Heathrow Airport

Compare and see reviews for airlines that fly from St. Louis to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
Virgin AtlanticPriceFrom £401Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £423Free CancellationRating
6.7
7,716 reviews
Search British Airways flights
Air CanadaPriceFrom £427Free CancellationRating
7.1
10,690 reviews
Search Air Canada flights
American AirlinesPriceFrom £572Free CancellationRating
7.2
11,232 reviews
Search American Airlines flights

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Northampton
Stratford-upon-Avon
Swindon
Southend-on-Sea
Canterbury
Ipswich
Ilford
Poole
Guildford
Chelmsford
Hayes
Dover
Swanage
Folkestone

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from St. Louis.

Can I find flights from St. Louis to London with flexible booking policies on momondo?

Yes. All flights to London from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to London?

Once you have performed a search for St. Louis to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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