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St. Louis

$432+ Cheap flights from Heathrow (LHR) to St. Louis (STL)

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 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or September, booked 71 days in advance, depart on a Monday or Wednesday and return on a Thursday

Cheap flight deals from Heathrow to St. Louis

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 July 27, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:30 am
LHR
-
STL
2 stops16h 41m
Lufthansa
Wed 9/2312:28 pm
STL
-
LHR
1 stop11h 27m
Lufthansa
Deal found 7/25$818
This Cheapflightsfares deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:30 am
LHR
-
STL
2 stops16h 36m
Lufthansa
Wed 9/303:30 pm
STL
-
LHR
1 stop21h 10m
Lufthansa
Deal found 7/27$819
This Kiwi.com deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Wed 9/2312:28 pm
STL
-
LHR
1 stop11h 27m
Multiple Airlines
Deal found 7/25$820
This Scandinavian Airlines deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:40 am
LHR
-
STL
2 stops23h 08m
Scandinavian Airlines
Wed 11/111:30 pm
STL
-
LHR
2 stops23h 00m
Scandinavian Airlines
Deal found 7/25$825
This Gotogate deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Wed 9/1612:10 pm
STL
-
LHR
1 stop12h 20m
Multiple Airlines
Deal found 7/26$826
This Flightcatchers deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightcatchers is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:55 am
LHR
-
STL
2 stops16h 03m
Virgin Atlantic
Tue 9/2910:05 am
STL
-
LHR
2 stops14h 15m
Virgin Atlantic
Deal found 7/26$827
This Lufthansa deal was found by Cheapflights users on 7/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/86:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Tue 9/1512:28 pm
STL
-
LHR
1 stop11h 27m
Multiple Airlines
Deal found 7/24$828
This Expedia deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/76:30 am
LHR
-
STL
1 stop12h 55m
Lufthansa
Wed 10/71:29 pm
STL
-
LHR
2 stops21h 11m
Lufthansa
Deal found 7/27$829
This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/37:30 pm
LHR
-
STL
1 stop24h 15m
Lufthansa
Tue 11/1011:38 am
STL
-
LHR
1 stop12h 42m
Lufthansa
Deal found 7/23$830
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/239:00 am
LHR
-
STL
2 stops16h 29m
United Airlines
Mon 11/302:00 pm
STL
-
LHR
1 stop13h 10m
United Airlines
Deal found 7/23$831
This Air Canada deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:40 am
LHR
-
STL
2 stops16h 02m
Air Canada
Wed 9/2312:10 pm
STL
-
LHR
1 stop12h 20m
Air Canada
Deal found 7/23$832
This United Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:25 am
LHR
-
STL
2 stops15h 41m
United Airlines
Thu 9/1712:28 pm
STL
-
LHR
1 stop12h 47m
United Airlines
Deal found 7/26$833

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 July 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$818
(Cheapflightsfares)

One-way from

$432

Popular in

July

Cheapest in

February

Average price

$1,336
Provider with most accurate pricing for London Heathrow-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for London Heathrow-Lambert-St Louis flights.
Search Deals
From London Heathrow to Lambert-St Louis
Search Deals
One-way flight from London Heathrow to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($205 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated July 27, 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 round-trip
Quickest round-trip

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/9

6:30 am-1:25 pm

1 stop12h 55m

Lambert-St Louis

Wed 9/16

12:28 pm-5:55 am

1 stop11h 27m

$828

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/2

7:25 am-5:06 pm

2 stops15h 41m

Lambert-St Louis

Wed 9/23

1:00 pm-6:55 am

1 stop11h 55m

$833

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

7:25 am-5:06 pm

2 stops15h 41m

Lambert-St Louis

Thu 9/17

12:28 pm-7:15 am

1 stop12h 47m

$833

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/16

10:00 am-2:15 pm

1 stop34h 15m

Lambert-St Louis

Sun 9/20

3:13 pm-7:45 am

1 stop34h 32m

$866

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 9/8

11:45 am-11:42 pm

2 stops17h 57m

Lambert-St Louis

Tue 9/15

10:29 am-8:50 am

2 stops16h 21m

$870

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 9/3

7:25 am-5:06 pm

2 stops15h 41m

Lambert-St Louis

Sun 9/13

12:25 pm-8:40 pm

1 stop26h 15m

$874

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 9/26

6:50 am-3:43 pm

2 stops14h 53m

Lambert-St Louis

Wed 9/30

10:27 am-7:15 am

2 stops14h 48m

$877

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 9/24

7:30 am-6:16 pm

2 stops16h 46m

Lambert-St Louis

Mon 9/28

1:29 pm-8:30 am

1 stop13h 01m

$877

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 10/8

6:50 am-3:43 pm

2 stops14h 53m

Lambert-St Louis

Mon 10/19

10:27 am-6:55 am

2 stops14h 28m

$880
Cheapest one-way
Quickest one-way

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/23

6:30 am-1:25 pm

1 stop12h 55m

$538

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Compare providers for flights from Heathrow to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to St. Louis in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London Heathrow Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London Heathrow Airport-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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?

The best time to book flights from London Heathrow Airport to St. Louis is 25 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 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 $743). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of $1,336). 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 LHR to STL?

Find hourly flight availability from Heathrow to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 27, 2026.

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

How much does it cost to fly round-trip from London Heathrow Airport to St. Louis?

Airfare is below average for this route at the moment.

London Heathrow Airport to St. Louis flights typically cost between $959 and $1,460 in September.
The cheapest round-trip price found within the last 5 days was $818 on Lufthansa (Sep 2-Sep 23).

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 July 27, 2026.
Peruse reviews from past customers who have flown with American Airlines and British Airways from London Heathrow Airport to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,842 reviews

Boarding

7.5

Comfort

7.2

Entertainment

6.8

Overall

7.1

Crew

7.9

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
American Airlines
7.1
Good
11,842 reviews
American Airlines
7.1
Good
11,842 reviews

Boarding

7.5

Comfort

7.2

Entertainment

6.8

Overall

7.1

Crew

7.9

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
British Airways
6.7
Okay
8,132 reviews
American Airlines
7.1
Good
11,842 reviews

Boarding

7.5

Comfort

7.2

Entertainment

6.8

Overall

7.1

Crew

7.9

Food

6.4

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

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?

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

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

    For as low as $833, United Airlines can have you in St. Louis from London Heathrow Airport in 15h 41m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi.

  • 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 $791. Another airline that can offer you cheap pricing is American Airlines. You may be able to fly from London Heathrow Airport to St. Louis for 22% less than the average price by searching for these airlines.

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

    One-way options have recently been found by users for as low as $438 on Finnair. Other airlines that offer cheap prices include British Airways from $519 and American Airlines from $575 one-way.

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

    Consider American Airlines (82%), Aer Lingus (82%) or Finnair (82%) when booking your flight. These represent the most reliable airlines when flying from London Heathrow Airport to St. Louis.

  • 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 vacation 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 $743). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of $1,336). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington

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Alternative routes for Heathrow to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Heathrow to St. Louis

Discover the top 2 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 2,558,603 searches. Data last updated July 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$791Average$964FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$803Average$1,384FlexibilityNo cancel feeOn-time71%

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