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Cheap flights from London Heathrow Airport to St. Louis from £400

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
24 May — 31 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or March, booked 72 days in advance, depart on a Thursday or Monday and return on a Wednesday

Cheap flight deals from Heathrow to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to St. Louis
Explore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 April 2026.

Wed 2/912:15
LHR
-
STL
1 stop12h 59m
British Airways
Wed 23/916:47
STL
-
LHR
1 stop10h 38m
British Airways
Deal found 19/4£616
Wed 2/910:20
LHR
-
STL
2 stops19h 31m
Finnair
Wed 23/912:43
STL
-
LHR
1 stop14h 22m
Finnair
Deal found 20/4£629
Mon 14/918:10
LHR
-
STL
2 stops35h 10m
Finnair
Mon 21/912:43
STL
-
LHR
1 stop18h 07m
Finnair
Deal found 20/4£630
Tue 8/911:45
LHR
-
STL
2 stops17h 52m
KLM
Tue 22/911:51
STL
-
LHR
1 stop12h 34m
KLM
Deal found 20/4£633
Fri 28/814:25
LHR
-
STL
1 stop15h 17m
American Airlines
Thu 3/916:18
STL
-
LHR
1 stop12h 12m
American Airlines
Deal found 20/4£634
Mon 14/913:10
LHR
-
STL
1 stop12h 53m
American Airlines
Thu 24/918:51
STL
-
LHR
1 stop13h 34m
American Airlines
Deal found 20/4£637
Wed 28/1015:00
LHR
-
STL
1 stop13h 41m
American Airlines
Tue 3/1118:45
STL
-
LHR
1 stop10h 55m
American Airlines
Deal found 19/4£638
Tue 8/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 22/921:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 20/4£641
Wed 2/908:40
LHR
-
STL
2 stops16h 02m
Multiple Airlines
Sun 6/913:30
STL
-
LHR
2 stops17h 05m
Multiple Airlines
Deal found 20/4£643

Find flight deals from Heathrow to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to St. Louis (STL). 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 24 April 2026.

Round-trip from

£616

One-way from

£400

Popular in

July

Cheapest in

February

Average price

£726

Good round-trip deal

£624 or less
British Airways
  • British Airways
  • 2/9-23/9
  • 2 total stops
  • 23h 37m total
  • London to St. Louis
Search Deals
Lufthansa
  • Lufthansa
  • 9/9
  • 1 total stop
  • 12h 55m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£61 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to St. Louis 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 24 April 2026.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

13:10-20:19

1 stop13h 09m

Lambert-St Louis

Tue 22/9

12:47-06:55

1 stop12h 08m

£652

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 23/9

06:30-16:55

2 stops16h 25m

Lambert-St Louis

Wed 30/9

11:51-07:15

1 stop13h 24m

£653

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

08:40-20:31

2 stops17h 51m

Lambert-St Louis

Tue 22/9

10:45-08:50

2 stops16h 05m

£654

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 8/7

14:45-23:56

1 stop15h 11m

Lambert-St Louis

Sun 12/7

19:55-06:50

1 stop28h 55m

£771

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 20/5

06:30-16:46

2 stops16h 16m

Lambert-St Louis

Wed 27/5

16:25-12:05

1 stop13h 40m

£774

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 19/5

06:30-16:10

2 stops15h 40m

Lambert-St Louis

Tue 26/5

13:27-10:20

2 stops14h 53m

£774

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 12/5

06:30-17:16

2 stops16h 46m

Lambert-St Louis

Thu 9/7

10:51-07:15

1 stop14h 24m

£781

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 8/5

06:30-16:15

2 stops15h 45m

Lambert-St Louis

Fri 15/5

19:01-13:15

1 stop12h 14m

£783

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 21/5

06:30-17:16

2 stops16h 46m

Lambert-St Louis

Thu 28/5

10:19-08:50

2 stops16h 31m

£804

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 15/5

06:30-17:05

2 stops16h 35m

Lambert-St Louis

Mon 1/6

16:25-12:05

1 stop13h 40m

£811

Flights are sorted by cheapest return flights first.

Deals found on 20/4

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

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

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Heathrow 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 London Heathrow Airport to St. Louis

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

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to St. Louis, you should look to book at least 71 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £552). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £865). 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 London Heathrow Airport to St. Louis?

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 24 April 2026.
Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andAir Canada from London Heathrow Airport to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Crew

8.1

Entertainment

7.5

Comfort

7.3

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
687 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Crew

8.1

Entertainment

7.5

Comfort

7.3

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
9,644 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Crew

8.1

Entertainment

7.5

Comfort

7.3

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!
Air Canada
7.1
Good
10,960 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Crew

8.1

Entertainment

7.5

Comfort

7.3

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!
Lufthansa
6.8
Okay
7,944 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Crew

8.1

Entertainment

7.5

Comfort

7.3

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
7,910 reviews
Virgin Atlantic
7.5
Good
687 reviews
Check prices

Overall

7.5

Food

6.9

Boarding

7.7

Crew

8.1

Entertainment

7.5

Comfort

7.3

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 Heathrow to St. Louis. 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 into for flights to St. Louis from London Heathrow?

    For a flight from London Heathrow to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 2 inbound flights from London Heathrow per day. 10 airlines have flights to Lambert-St Louis from London Heathrow on a regular basis.

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

    Departing from London Heathrow Airport to St. Louis will take you 13h 09m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi. This flight may include one or multiple stops.

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

    Cheapflights users have booked flights from London Heathrow Airport to St. Louis round-trip from £198. Other airlines that can offer you cheap pricing are United Airlines, from £470, and British Airways, from £476. American Airlines is priced at 73% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from London Heathrow Airport to St. Louis one-way?

    For one-way options, check prices for British Airways. According to our data, you can fly for as low as £341. Users have also found prices from £356 and £360 on United Airlines and Finnair, respectively.

  • What are the cheapest flights from London Heathrow Airport to St. Louis?

    While on average a flight from London Heathrow Airport to St. Louis is generally £658, our data shows the cheapest flight currently is £584. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £614 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Heathrow to St. Louis 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 London Heathrow Airport to St. Louis?

    Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £552). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £865). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Heathrow to St. Louis

Discover the top 10 airlines that operate flights from Heathrow to St. Louis. 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 24 April 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£198Average£730FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest£470Average£735FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£476Average£732FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£517Average£746FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£552Average£763FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£583Average£665FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Scandinavian AirlinesCheapest£592Average£699FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air CanadaCheapest£599Average£714FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£649Average£797FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IberiaCheapest£653Average£746FlexibilityNo cancel feeOn-time77%
Search Iberia 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 Heathrow to St. Louis?

Cheapflights makes it easy to find Heathrow to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Louis from Heathrow.

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

Certainly. Search results for flights to St. Louis from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on Heathrow to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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