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Cheap flights from St. Louis to London Heathrow Airport from £264

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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
16 apr — 23 apr1
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 17 mars 2026.

sön 3/513:00
STL
-
LHR
1 stop15h 00m
Air Canada
tis 12/506:50
LHR
-
STL
2 stops19h 35m
Air Canada
Deal found 16/3£542
mån 28/912:10
STL
-
LHR
1 stop15h 50m
Multiple Airlines
ons 14/1006:30
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 12/3£544
ons 15/412:27
STL
-
LHR
1 stop13h 28m
Finnair
ons 22/416:25
LHR
-
STL
Nonstop9h 05m
Finnair
Deal found 12/3£555
ons 29/416:05
STL
-
LHR
1 stop13h 45m
Air Canada
ons 6/508:40
LHR
-
STL
2 stops17h 45m
Air Canada
Deal found 15/3£556
tis 28/416:05
STL
-
LHR
1 stop13h 45m
Air Canada
tis 5/517:15
LHR
-
STL
2 stops33h 10m
Air Canada
Deal found 14/3£556
mån 5/1018:49
STL
-
LHR
2 stops17h 36m
Lufthansa
fre 16/1006:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 15/3£557
tis 5/519:09
STL
-
LHR
2 stops17h 16m
Lufthansa
tis 19/509:00
LHR
-
STL
2 stops18h 13m
Lufthansa
Deal found 12/3£558
mån 5/1015:42
STL
-
LHR
2 stops19h 58m
Scandinavian Airlines
lör 24/1006:40
LHR
-
STL
2 stops22h 59m
Scandinavian Airlines
Deal found 15/3£560
tis 6/1015:30
STL
-
LHR
1 stop17h 10m
Lufthansa
fre 16/1006:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Deal found 15/3£562

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 17 mars 2026.

Round-trip from

£542

One-way from

£264

Popular in

June

Cheapest in

October

Average price

£595
Air Canada
  • Air Canada
  • 3/5-12/5
  • 3 total stops
  • 34h 35m total
  • St. Louis to London
Search Deals
9/8
  • 9/8
  • 2 total stops
  • 27h 35m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£141 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 17 mars 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

ons 2/9

21:35-11:35

Nonstop8h 00m

London Heathrow

ons 9/9

10:05-18:21

1 stop14h 16m

£583

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mån 30/3

12:04-13:15

1 stop19h 11m

London Heathrow

tis 14/4

11:45-23:36

2 stops17h 51m

£583

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mån 13/4

18:05-09:40

1 stop33h 35m

London Heathrow

tis 28/4

17:40-15:25

1 stop27h 45m

£593

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

ons 13/5

13:05-10:00

1 stop14h 55m

London Heathrow

ons 20/5

08:40-20:25

2 stops17h 45m

£599

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

fre 10/4

06:32-07:10

1 stop18h 38m

London Heathrow

ons 15/4

06:30-16:50

2 stops16h 20m

£620
Fastest return journey

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

sön 6/9

13:01-06:55

1 stop11h 54m

London Heathrow

sön 20/9

16:25-19:30

Nonstop9h 05m

£656

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

tors 23/4

10:00-06:45

1 stop14h 45m

London Heathrow

sön 26/4

06:50-15:48

2 stops14h 58m

£657

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lör 2/5

13:00-06:30

1 stop11h 30m

London Heathrow

lör 16/5

14:05-20:25

1 stop12h 20m

£675

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

fre 15/5

19:01-14:35

2 stops13h 34m

London Heathrow

tis 19/5

06:30-16:46

2 stops16h 16m

£688

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

tors 14/5

13:00-10:00

1 stop15h 00m

London Heathrow

mån 18/5

06:50-16:39

2 stops15h 49m

£721

Flights are sorted by cheapest return flights first.

Deals found on 13/3

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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?

Use this chart to determine the optimal time to book a return flight from St. Louis to Heathrow. Price data was last updated on 13 March 2026.

The best time to book flights from St. Louis to London Heathrow Airport is 50 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, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £396). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £769). 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.

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 17 mars 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
682 reviews
Check prices

Boarding

7.7

Crew

8.2

Overall

7.5

Comfort

7.3

Entertainment

7.6

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
Virgin Atlantic
7.5
Good
682 reviews
Virgin Atlantic
7.5
Good
682 reviews
Check prices

Boarding

7.7

Crew

8.2

Overall

7.5

Comfort

7.3

Entertainment

7.6

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!
British Airways
6.7
Okay
7,799 reviews
Virgin Atlantic
7.5
Good
682 reviews
Check prices

Boarding

7.7

Crew

8.2

Overall

7.5

Comfort

7.3

Entertainment

7.6

Food

6.9

Reviews

1 / 20
6.0
Good

Pratap,Aug 2025

JFK - LHR

The flight is clean, food good and the staff are excellent! Very professional, polite and accommodating. The seat itself is really mediocre. Can’t believe there is not inch of storage space. Believe it or not it there is not place even to put away your phone or pen!! Very very surprising and terribly inconvenient. No coat hanger hook either. Had to give it away. ALL IN ALL VERY INCONVENIENT business class seat compared to their peers. What is even more surprising is that this on their relatively new fleet of Airbus A350-1000. I was having com platelets different expectations of Virgin and this has disappointed me. Everything else is just as good and as you would expect from Virgin!

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 0 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 £583, Finnair can have you in London Heathrow Airport from St. Louis in 8h. 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 £413, 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 34% less than the average price by searching for these airlines.

  • 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, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £396). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £769). 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
Milton Keynes
Wembley
Croydon
Northampton
Luton
Hounslow
Slough
Gatwick
Ilford
Hayes
Brentford
Colchester
Guildford
Watford
Kingston upon Thames
Eastbourne
Romford
Ipswich
Swindon
Bedford

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 17 mars 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£413Average£587FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£436Average£667FlexibilityNo 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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