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Cheap flights from St. Louis to London Heathrow Airport from £238

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
24 Jun — 1 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or November, booked 50 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from St. Louis to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to Heathrow
Explore the most affordable flight options available from St. Louis to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 May 2026.

Thu 27/815:35
STL
-
LHR
1 stop13h 20m
British Airways
Mon 31/808:55
LHR
-
STL
1 stop13h 46m
British Airways
Deal found 22/5£729
Wed 2/921:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Mon 7/909:15
LHR
-
STL
1 stop13h 48m
American Airlines
Deal found 23/5£731
Tue 4/813:13
STL
-
LHR
1 stop11h 32m
Austrian Airlines
Sat 22/811:05
LHR
-
STL
1 stop12h 01m
Austrian Airlines
Deal found 22/5£731
Wed 21/1012:10
STL
-
LHR
2 stops17h 40m
Air Canada
Wed 28/1013:00
LHR
-
STL
2 stops31h 30m
Air Canada
Deal found 21/5£733
Mon 17/812:59
STL
-
LHR
1 stop11h 46m
Austrian Airlines
Sun 23/808:00
LHR
-
STL
1 stop15h 06m
Austrian Airlines
Deal found 24/5£734
Tue 1/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Deal found 21/5£736
Mon 28/1220:01
STL
-
LHR
1 stop28h 54m
Multiple Airlines
Fri 1/118:00
LHR
-
STL
1 stop27h 30m
Multiple Airlines
Deal found 21/5£737
Fri 14/815:39
STL
-
LHR
2 stops18h 21m
Scandinavian Airlines
Fri 21/806:40
LHR
-
STL
2 stops23h 18m
Scandinavian Airlines
Deal found 24/5£739
Thu 4/617:20
STL
-
LHR
1 stop13h 55m
Delta
Mon 22/611:15
LHR
-
STL
1 stop12h 52m
Delta
Deal found 20/5£740

Find flight deals from St. Louis to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 25 May 2026.

Round-trip from

£729

One-way from

£238

Popular in

June

Cheapest in

October

Average price

£777
British Airways
  • British Airways
  • 27/8-31/8
  • 2 total stops
  • 27h 06m total
  • St. Louis to London
Search Deals
British Airways
  • British Airways
  • 23/8
  • Nonstop
  • 8h 00m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£167 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from St. Louis to Heathrow 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, Cheapflights users made 858,174 searches. Data last updated 25 May 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

Cheapest return flight

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 31/8

19:05-13:15

1 stop12h 10m

London Heathrow

Sat 5/9

09:20-15:57

1 stop12h 37m

£740

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 4/9

13:30-06:25

1 stop10h 55m

London Heathrow

Sun 13/9

09:20-15:57

1 stop12h 37m

£740

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 30/8

17:23-13:15

1 stop13h 52m

London Heathrow

Sun 6/9

09:20-15:57

1 stop12h 37m

£740

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 12/10

13:30-21:40

2 stops26h 10m

London Heathrow

Mon 19/10

21:05-20:49

3 stops29h 44m

£772

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 29/8

07:05-20:10

1 stop31h 05m

London Heathrow

Sun 6/9

11:45-20:50

1 stop15h 05m

£781

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 12/8

21:35-11:35

Nonstop8h 00m

London Heathrow

Sun 16/8

08:55-18:10

1 stop15h 15m

£812

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 13/9

15:42-21:40

2 stops23h 58m

London Heathrow

Sun 20/9

06:40-20:50

3 stops20h 10m

£838

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 7/9

13:30-16:00

2 stops20h 30m

London Heathrow

Mon 21/9

07:05-23:37

3 stops22h 32m

£873

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 21/6

13:20-06:30

1 stop11h 10m

London Heathrow

Wed 19/8

09:30-18:42

1 stop15h 12m

£916
Fastest return journey

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 26/8

21:35-11:35

Nonstop8h 00m

London Heathrow

Sun 6/9

16:25-19:30

Nonstop9h 05m

£922

Flights are sorted by cheapest return flights first.

Deals found on 23/5

Showing 1-10 of 19 resultsSorted by cheapest first
1
2

Best time to book a flight from St. Louis to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from St. Louis with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to London Heathrow Airport

How far ahead should I book a flight from St. Louis to London Heathrow Airport?

The best time to book flights from St. Louis to London Heathrow Airport is 49 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

Currently, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £490). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £1,052). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to LHR?

Find hourly flight availability from St. Louis to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 25 May 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to London Heathrow Airport as you normally would.

How much does it cost for a return flight from St. Louis to London Heathrow Airport?

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 25 May 2026.
See what other customers who have flown with Virgin Atlantic and British Airways from St. Louis to London Heathrow Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Crew

8.1

Comfort

7.3

Entertainment

7.5

Overall

7.5

Boarding

7.7

Food

6.9

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
689 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Crew

8.1

Comfort

7.3

Entertainment

7.5

Overall

7.5

Boarding

7.7

Food

6.9

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,004 reviews
Virgin Atlantic
7.5
Good
689 reviews
Check prices

Crew

8.1

Comfort

7.3

Entertainment

7.5

Overall

7.5

Boarding

7.7

Food

6.9

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to London Heathrow?

    Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London Heathrow. You should not have trouble finding flights to London Heathrow from Lambert-St Louis; the airport handles an average of 2 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 2 airlines have flights from the St. Louis airport to London Heathrow. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

  • How long is the flight from St. Louis to London Heathrow Airport?

    For as low as £740, Delta can have you in London Heathrow Airport from St. Louis in 10h 55m. There are 4186 mi between St. Louis and London Heathrow Airport. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

    Virgin Atlantic, at £409, was found to be the cheapest airline from St. Louis to London Heathrow Airport. An alternate airline flying to your destination would be British Airways. You may be able to fly from St. Louis to London Heathrow Airport for 36% less than the average price by searching for these airlines.

  • What are the most reliable airlines from St. Louis to London Heathrow Airport?

    Before booking your flight to London Heathrow Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: American Airlines (13%), Aer Lingus (13%), Finnair( 13%).

  • Can I find deals for flights from St. Louis to Heathrow that include hotel bookings?

    Yes. In addition to deals on St. Louis to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Heathrow.

  • Can I find deals for business class flights from St. Louis to Heathrow?

    Yes. Cheapflights offers flight deals from St. Louis to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £490). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £1,052). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Milton Keynes
Croydon
Northampton
Wembley
Luton
Gatwick
Slough
Ilford
Hayes
Brentford
Colchester
Watford
Romford
Kingston upon Thames
Eastbourne
Ipswich
Swindon
Guildford
Southall

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from St. Louis to Heathrow

Discover the top 2 airlines that operate flights from St. Louis to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 25 May 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£409Average£562FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£431Average£659FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Heathrow?

Cheapflights helps you search for flights from St. Louis to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Heathrow?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from St. Louis to Heathrow.

Can Cheapflights find flights from St. Louis to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from St. Louis to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from St. Louis to Heathrow become cheaper?

Not ready to book yet? You can track prices for flights from St. Louis to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.

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