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Cheap flights from St. Louis to London Heathrow Airport from £237

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 18/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
29 Mar — 5 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 April, booked 17 days in advance, depart on a Monday 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 27 February 2026.

Sun 1/311:55
STL
-
LHR
1 stop12h 30m
Delta
Fri 13/306:30
LHR
-
STL
2 stops19h 36m
Delta
Deal found 25/2£481
Mon 17/818:49
STL
-
LHR
2 stops17h 36m
Lufthansa
Mon 24/819:30
LHR
-
STL
1 stop23h 55m
Lufthansa
Deal found 24/2£482
Wed 19/818:49
STL
-
LHR
2 stops16h 51m
Lufthansa
Fri 28/806:30
LHR
-
STL
2 stops15h 08m
Lufthansa
Deal found 24/2£483
Sat 25/416:05
STL
-
LHR
2 stops22h 55m
Air Canada
Wed 6/508:40
LHR
-
STL
2 stops17h 45m
Air Canada
Deal found 23/2£484
Mon 30/306:00
STL
-
LHR
1 stop19h 15m
Delta
Tue 14/406:30
LHR
-
STL
2 stops16h 12m
Delta
Deal found 24/2£485
Wed 16/908:55
STL
-
LHR
2 stops15h 35m
Air Canada
Wed 23/908:40
LHR
-
STL
2 stops16h 01m
Air Canada
Deal found 24/2£486
Sun 1/318:57
STL
-
LHR
1 stop11h 03m
British Airways
Fri 13/311:45
LHR
-
STL
1 stop12h 45m
British Airways
Deal found 25/2£486
Mon 30/309:45
STL
-
LHR
2 stops15h 25m
Delta
Tue 7/409:55
LHR
-
STL
2 stops19h 30m
Delta
Deal found 24/2£488
Mon 30/317:59
STL
-
LHR
2 stops13h 46m
Delta
Wed 8/406:30
LHR
-
STL
2 stops15h 46m
Delta
Deal found 24/2£489
Tue 5/518:54
STL
-
LHR
2 stops15h 46m
Lufthansa
Tue 19/519:30
LHR
-
STL
1 stop23h 55m
Lufthansa
Deal found 26/2£489
Wed 2/913:30
STL
-
LHR
1 stop11h 45m
Delta
Fri 11/906:15
LHR
-
STL
2 stops16h 40m
Delta
Deal found 24/2£490

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 27 February 2026.

Round-trip from

£481

One-way from

£237

Popular in

June

Cheapest in

October

Average price

£704

Good round-trip deal

£471 or less
Iberia
  • Iberia
  • 26/4-6/5
  • 3 total stops
  • 33h 11m total
  • St. Louis to London
Search Deals
18/3
  • 18/3
  • 3 total stops
  • 24h 58m total
  • St. Louis to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£130 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to London Heathrow.
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 27 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

Tue 11/8

18:00-11:35

1 stop35h 35m

London Heathrow

Fri 21/8

14:10-14:02

1 stop29h 52m

£495

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 19/4

09:10-06:55

2 stops15h 45m

London Heathrow

Wed 29/4

12:15-21:08

2 stops14h 53m

£509

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 19/4

16:49-11:35

1 stop12h 46m

London Heathrow

Tue 28/4

08:30-15:24

1 stop12h 54m

£520

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/4

06:30-06:45

1 stop18h 15m

London Heathrow

Thu 9/4

06:50-15:48

2 stops14h 58m

£521

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 2/4

20:15-06:45

1 stop28h 30m

London Heathrow

Wed 8/4

12:05-15:24

1 stop33h 19m

£532

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 15/8

18:00-07:40

1 stop31h 40m

London Heathrow

Sat 29/8

17:40-14:02

1 stop26h 22m

£532

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 26/3

06:00-07:30

1 stop20h 30m

London Heathrow

Thu 2/4

08:30-15:24

1 stop12h 54m

£557

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/4

17:25-13:50

2 stops14h 25m

London Heathrow

Thu 9/4

09:55-21:06

2 stops17h 11m

£580

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 19/5

08:30-11:10

1 stop20h 40m

London Heathrow

Tue 26/5

07:25-17:23

2 stops15h 58m

£603

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 16/7

16:48-09:40

1 stop34h 52m

London Heathrow

Thu 30/7

17:40-20:02

1 stop32h 22m

£842

Flights are sorted by cheapest return flights first.

Deals found on 27/2

Showing 1-10 of 17 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?

Use this chart to determine the optimal time to book a return flight from St. Louis to Heathrow. Price data was last updated on 20 February 2026.

The best time to book flights from St. Louis to London Heathrow Airport is 17 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 £391). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £739). 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.

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 27 February 2026.
See what other customers who have flown with Virgin Atlantic, United Airlines, andBritish 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
679 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Boarding

7.7

Comfort

7.3

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
679 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Boarding

7.7

Comfort

7.3

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!
United Airlines
7.4
Good
9,358 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Boarding

7.7

Comfort

7.3

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
7,772 reviews
Virgin Atlantic
7.5
Good
679 reviews
Check prices

Overall

7.5

Crew

8.2

Entertainment

7.6

Boarding

7.7

Comfort

7.3

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 3 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 £495, United Airlines can have you in London Heathrow Airport from St. Louis in 35h 35m. There are 4186 mi between St. Louis and London Heathrow Airport.

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

    Virgin Atlantic, at £406, was found to be the cheapest airline from St. Louis to London Heathrow Airport.Alternate airlines flying return to your destination include British Airways and United Airlines. 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 cheapest flights from St. Louis to London Heathrow Airport?

    The cheapest flight price from St. Louis to London Heathrow Airport is £435. On average you can expect to pay £579. The most popular route, (Lambert-St Louis - London Heathrow), can usually be booked for £472.

  • 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 £391). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of £739). 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
Croydon
Wembley
Luton
Northampton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Kingston upon Thames
Eastbourne
Ipswich
Chelmsford
Swindon
Bedford

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from St. Louis to Heathrow

Discover the top 3 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 27 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£406Average£577FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£428Average£655FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£501Average£672FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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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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