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St. Louis

$428+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
Mar 31 — Apr 71
Tue 3/31
Tue 4/7
1 adult, Economy
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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 March 1, 2026.

This Ticket deal was found by Cheapflights users on 2/27. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1310:45 am
LHR
-
STL
1 stop11h 57m
Virgin Atlantic
Mon 4/201:02 pm
STL
-
LHR
1 stop12h 13m
Virgin Atlantic
Deal found 2/27$703
This TravelUp deal was found by Cheapflights users on 2/28. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:45 am
LHR
-
STL
1 stop12h 03m
British Airways
Wed 9/234:47 pm
STL
-
LHR
1 stop10h 38m
British Airways
Deal found 2/28$707
This Travcart deal was found by Cheapflights users on 2/28. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2111:15 am
LHR
-
STL
1 stop12h 29m
Virgin Atlantic
Wed 4/291:03 pm
STL
-
LHR
1 stop12h 12m
Virgin Atlantic
Deal found 2/28$709
This TravelUp deal was found by Cheapflights users on 3/1. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:25 pm
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Wed 9/304:14 pm
STL
-
LHR
1 stop14h 36m
Multiple Airlines
Deal found 3/1$714
This ChecknFly deal was found by Cheapflights users on 2/26. 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 ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/24:35 pm
LHR
-
STL
2 stops22h 39m
Finnair
Wed 9/2312:47 pm
STL
-
LHR
1 stop12h 08m
Finnair
Deal found 2/26$715
This TravelUp deal was found by Cheapflights users on 3/1. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:25 pm
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 9/309:35 pm
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 3/1$721
This Travcart deal was found by Cheapflights users on 2/28. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2011:15 am
LHR
-
STL
1 stop18h 21m
Virgin Atlantic
Thu 4/3011:42 am
STL
-
LHR
1 stop13h 33m
Virgin Atlantic
Deal found 2/28$722
This TravelUp deal was found by Cheapflights users on 2/27. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/210:05 am
LHR
-
STL
1 stop14h 24m
Multiple Airlines
Wed 9/234:14 pm
STL
-
LHR
1 stop14h 36m
Multiple Airlines
Deal found 2/27$723
This Travcart deal was found by Cheapflights users on 2/27. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1410:45 am
LHR
-
STL
1 stop11h 57m
Virgin Atlantic
Wed 5/131:56 pm
STL
-
LHR
1 stop11h 14m
Virgin Atlantic
Deal found 2/27$725
This British Airways deal was found by Cheapflights users on 3/1. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/137:25 pm
LHR
-
STL
2 stops30h 08m
British Airways
Wed 4/228:03 pm
STL
-
LHR
1 stop10h 12m
British Airways
Deal found 3/1$727

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 March 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$703
(Ticket)

One-way from

$428

Popular in

July

Cheapest in

February

Average price

$887

Good round-trip deal

$803 or less

Good one-way deal

$537 or less
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. 9% potential increase in price ($99 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from London Heathrow to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from London Heathrow to Lambert-St Louis.
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 March 1, 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

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/21

6:30 am-5:44 pm

2 stops17h 14m

Lambert-St Louis

Wed 4/29

5:59 pm-1:45 pm

2 stops13h 46m

$773

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 4/24

6:15 am-4:42 pm

2 stops16h 27m

Lambert-St Louis

Fri 5/8

7:01 pm-2:35 pm

2 stops13h 34m

$846

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 5/16

6:30 am-3:19 pm

2 stops14h 49m

Lambert-St Louis

Wed 5/20

6:57 pm-2:35 pm

2 stops13h 38m

$882

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 8/21

11:30 am-11:01 pm

2 stops17h 31m

Lambert-St Louis

Thu 12/17

9:00 am-6:25 am

1 stop15h 25m

$889

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 5/19

8:55 pm-7:31 pm

2 stops28h 36m

Lambert-St Louis

Thu 5/28

1:10 pm-9:05 am

1 stop13h 55m

$901

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 4/14

7:05 am-9:19 pm

3 stops20h 14m

Lambert-St Louis

Tue 4/21

1:02 pm-5:40 pm

2 stops22h 38m

$902

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 8/21

3:15 pm-11:37 pm

1 stop14h 22m

Lambert-St Louis

Sat 9/5

1:30 pm-10:20 am

2 stops14h 50m

$1,022

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 4/30

7:05 am-11:36 pm

3 stops22h 31m

Lambert-St Louis

Thu 5/7

10:49 am-6:30 pm

2 stops25h 41m

$1,043

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 6/29

6:50 am-10:44 pm

2 stops21h 54m

$611

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/9

6:30 pm-10:37 am

3 stops45h 07m

$620

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/26

Showing 1-10 of 19 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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 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?

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to St. Louis. Price data was last updated on February 27, 2026.

The best time to book flights from London Heathrow Airport to St. Louis is 89 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of $545). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of $844). 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 to fly round-trip 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 March 1, 2026.
Peruse reviews from past customers who have flown with United 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.
United Airlines
7.4
Good
9,375 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
United Airlines
7.4
Good
9,375 reviews
United Airlines
7.4
Good
9,375 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats
British Airways
6.7
Okay
7,774 reviews
United Airlines
7.4
Good
9,375 reviews

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Comfort

7.3

Crew

8.1

Reviews

1 / 20
6.0
Good

Gerry,Jan 2026

YVR - DEN

Seats were uncomfortable. Second leg of my flight on United had much more comfortable seats

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 0 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 $703, Virgin Atlantic can have you in St. Louis from London Heathrow Airport in 11h 57m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $555. Another airline that can offer you cheap pricing is United Airlines. You may be able to fly from London Heathrow Airport to St. Louis for 43% less than the average price by searching for these airlines.

  • 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 $732, our data shows the cheapest flight currently is $519. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay $749 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 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, September is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of $545). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of $844). 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
Swansea
Fairview Heights
Fenton
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

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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 March 1, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$555Average$821FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$654Average$857FlexibilityNo cancel feeOn-time69%

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