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Cheap flights from St. Louis to London from £210

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 20/10. 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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Find the cheapest flights from St. Louis to London (STL-LHR)

Cheap return flights

Logo
09:15 - 06:35STL-LHR
15h 20m1 stop
Logo
20:15 - 15:29LHR-STL
48h 14m2 stops
£390
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週一, 20 10月 - 週一, 27 10月
Delta Logo
07:05 - 09:00STL-LHR
19h 55m1 stop
Delta Logo
06:30 - 17:09LHR-STL
16h 39m2 stops
£391Delta
Find Deal
週二, 9 12月 - 週二, 16 12月
Air Canada Logo
13:30 - 09:35STL-LHR
14h 05m1 stop
Air Canada Logo
11:05 - 15:18LHR-STL
34h 13m2 stops
£392Air Canada
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週一, 13 10月 - 週一, 20 10月
Delta Logo
10:45 - 08:50STL-LHR
16h 05m2 stops
Delta Logo
06:15 - 18:02LHR-STL
17h 47m2 stops
£392Delta
Find Deal
週二, 14 10月 - 週三, 22 10月
United Airlines Logo
08:20 - 07:30STL-LHR
17h 10m1 stop
United Airlines Logo
18:00 - 15:29LHR-STL
27h 29m1 stop
£393United Airlines
Find Deal
週三, 19 11月 - 週五, 5 12月
United Airlines Logo
06:00 - 10:15STL-LHR
22h 15m1 stop
United Airlines Logo
06:30 - 13:55LHR-STL
13h 25m1 stop
£394United Airlines
Find Deal
週二, 30 12月 - 週五, 9 1月
Air Canada Logo
16:05 - 07:10STL-LHR
33h 05m2 stops
Air Canada Logo
18:00 - 15:29LHR-STL
27h 29m1 stop
£394Air Canada
Find Deal
週日, 7 12月 - 週四, 18 12月
Logo
13:59 - 06:35STL-LHR
10h 36m1 stop
Logo
13:10 - 20:23LHR-STL
13h 13m1 stop
£395
Find Deal
週一, 29 12月 - 週五, 9 1月
Virgin Atlantic Logo
10:45 - 06:45STL-LHR
14h 00m2 stops
Virgin Atlantic Logo
09:40 - 23:06LHR-STL
18h 26m2 stops
£399Virgin Atlantic
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週一, 20 10月 - 週四, 30 10月
Iberia Logo
12:53 - 08:35STL-LHR
13h 42m1 stop
Iberia Logo
19:40 - 09:57LHR-STL
20h 17m2 stops
£418Iberia
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週四, 15 1月 - 週一, 26 1月

Air Canada flights from St. Louis to London Heathrow Airport

Our best Air Canada deals on St. Louis to London Heathrow Airport flight tickets
Air Canada
13 Oct
STL13:30Lambert-St Louis
14h 05m
1 stop
LHR09:35London Heathrow
20 Oct
LHR11:05London Heathrow
34h 13m
2 stops
STL15:18Lambert-St Louis
£392
Find similar
Air Canada
7 Dec
STL16:05Lambert-St Louis
33h 05m
2 stops
LHR07:10London Heathrow
18 Dec
LHR18:00London Heathrow
27h 29m
1 stop
STL15:29Lambert-St Louis
£394
Find similar
Air Canada
11 Oct
STL13:30Lambert-St Louis
11h 00m
1 stop
LHR06:30London Heathrow
21 Oct
LHR06:50London Heathrow
14h 28m
2 stops
STL15:18Lambert-St Louis
£418
Find similar

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
19 Nov
STL08:20Lambert-St Louis
17h 10m
1 stop
LHR07:30London Heathrow
5 Dec
LHR18:00London Heathrow
27h 29m
1 stop
STL15:29Lambert-St Louis
£393
Find similar
United Airlines
30 Dec
STL06:00Lambert-St Louis
22h 15m
1 stop
LHR10:15London Heathrow
9 Jan
LHR06:30London Heathrow
13h 25m
1 stop
STL13:55Lambert-St Louis
£394
Find similar
United Airlines
11 Jan
STL14:45Lambert-St Louis
12h 55m
1 stop
LHR09:40London Heathrow
21 Jan
LHR11:35London Heathrow
15h 23m
1 stop
STL20:58Lambert-St Louis
£396
Find similar

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 5 9月 2025.
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

週一 20/10

09:15-06:35

1 stop15h 20m

London Heathrow

週一 27/10

20:15-15:29

2 stops48h 14m

£390

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週二 9/12

07:05-09:00

1 stop19h 55m

London Heathrow

週二 16/12

06:30-17:09

2 stops16h 39m

£391

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週一 13/10

13:30-09:35

1 stop14h 05m

London Heathrow

週一 20/10

11:05-15:18

2 stops34h 13m

£392

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週二 14/10

10:45-08:50

2 stops16h 05m

London Heathrow

週三 22/10

06:15-18:02

2 stops17h 47m

£392

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週三 19/11

08:20-07:30

1 stop17h 10m

London Heathrow

週五 5/12

18:00-15:29

1 stop27h 29m

£393

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週二 30/12

06:00-10:15

1 stop22h 15m

London Heathrow

週五 9/1

06:30-13:55

1 stop13h 25m

£394

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週日 7/12

16:05-07:10

2 stops33h 05m

London Heathrow

週四 18/12

18:00-15:29

1 stop27h 29m

£394

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週一 29/12

13:59-06:35

1 stop10h 36m

London Heathrow

週五 9/1

13:10-20:23

1 stop13h 13m

£395

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週一 20/10

10:45-06:45

2 stops14h 00m

London Heathrow

週四 30/10

09:40-23:06

2 stops18h 26m

£399

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

週四 15/1

12:53-08:35

1 stop13h 42m

London Heathrow

週一 26/1

19:40-09:57

2 stops20h 17m

£418

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 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 £589. The month of August is another great option to travel to London Heathrow Airport, with average flight prices from St. Louis averaging around £593.

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 Tuesday. momondo users have found tickets for Tuesday departures for as low as £554. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Friday is £1,315.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from St. Louis to London Heathrow Airport in the morning for as low as £670. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are £830 on average. Flights to London Heathrow Airport from St. Louis in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 £689 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 £604 on momondo.

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

Direct flights

None
There are no direct flights from St. Louis to London Heathrow Airport. There are no popular flight routes from St. Louis to London Heathrow Airport.
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  • 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 10h 32m.

  • 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 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
Air CanadaPriceFrom £435Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
Virgin AtlanticPriceFrom £470Free CancellationRating
7.4
663 reviews
Search Virgin Atlantic flights
British AirwaysPriceFrom £490Free CancellationRating
6.7
7,348 reviews
Search British Airways flights
KLMPriceFrom £530Free CancellationRating
7.8
1,382 reviews
Search KLM flights

Travelling to a place near London?

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

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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