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St. Louis

$365+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
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 January 26, 2026.

This Expedia deal was found by Cheapflights users on 1/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/136:30 am
LHR
-
STL
1 stop13h 25m
Lufthansa
Tue 3/171:14 pm
STL
-
LHR
1 stop11h 41m
Lufthansa
Deal found 1/25$594
This TravelUp deal was found by Cheapflights users on 1/25. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/912:05 pm
LHR
-
STL
2 stops56h 24m
Multiple Airlines
Mon 3/167:00 pm
STL
-
LHR
1 stop11h 15m
Multiple Airlines
Deal found 1/25$596
This TravelUp deal was found by Cheapflights users on 1/26. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/21:45 pm
LHR
-
STL
2 stops55h 30m
Multiple Airlines
Mon 3/26:55 pm
STL
-
LHR
1 stop10h 20m
Multiple Airlines
Deal found 1/26$600
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Thu 3/59:00 am
LHR
-
STL
2 stops18h 42m
United Airlines
Sat 3/147:41 am
STL
-
LHR
1 stop17h 14m
United Airlines
Deal found 1/26$605
This United Airlines deal was found by Cheapflights users on 1/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:30 am
LHR
-
STL
1 stop13h 25m
United Airlines
Wed 3/1811:25 am
STL
-
LHR
2 stops14h 15m
United Airlines
Deal found 1/25$606
This Expedia deal was found by Cheapflights users on 1/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/16:30 am
LHR
-
STL
1 stop13h 25m
Lufthansa
Sat 3/147:00 pm
STL
-
LHR
1 stop29h 55m
Lufthansa
Deal found 1/26$609
This United Airlines deal was found by Cheapflights users on 1/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/17:30 am
LHR
-
STL
2 stops17h 57m
United Airlines
Sat 2/71:15 pm
STL
-
LHR
1 stop12h 40m
United Airlines
Deal found 1/25$612
This United Airlines deal was found by Cheapflights users on 1/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/56:50 am
LHR
-
STL
2 stops15h 13m
United Airlines
Mon 2/91:15 pm
STL
-
LHR
1 stop12h 40m
United Airlines
Deal found 1/25$613
This Expedia deal was found by Cheapflights users on 1/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/98:45 am
LHR
-
STL
2 stops19h 14m
Lufthansa
Mon 3/167:00 pm
STL
-
LHR
2 stops15h 50m
Lufthansa
Deal found 1/25$617
This TravelUp deal was found by Cheapflights users on 1/26. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2311:15 am
LHR
-
STL
1 stop18h 41m
Multiple Airlines
Mon 3/21:34 pm
STL
-
LHR
1 stop11h 46m
Multiple Airlines
Deal found 1/26$619

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 January 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$594
(Expedia)

One-way from

$365
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$1,035

Good round-trip deal

$803 or less

Good one-way deal

$446 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. 8% potential increase in price ($88 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 26, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to St. Louis that are best for you.

Fly from

Heathrow

Fly to

St. Louis

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 3/5

9:00 am-9:42 pm

2 stops18h 42m

Lambert-St Louis

Sat 3/14

7:41 am-5:55 am

1 stop17h 14m

$605

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 4/17

6:30 am-1:25 pm

1 stop12h 55m

Lambert-St Louis

Tue 4/21

1:10 pm-6:45 am

1 stop11h 35m

$606

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/11

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Wed 3/18

5:41 pm-11:05 am

1 stop12h 24m

$606

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 3/13

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Tue 3/17

11:25 am-6:40 am

2 stops14h 15m

$606

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 3/19

8:30 am-9:07 pm

2 stops17h 37m

Lambert-St Louis

Tue 3/31

11:15 am-6:45 am

1 stop13h 30m

$612

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/18

6:30 am-5:59 pm

2 stops16h 29m

Lambert-St Louis

Tue 3/31

1:10 pm-11:45 am

1 stop16h 35m

$612

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/5

6:50 am-4:03 pm

2 stops15h 13m

Lambert-St Louis

Mon 2/9

1:15 pm-7:55 am

1 stop12h 40m

$613

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/23

9:55 am-6:07 pm

1 stop14h 12m

Lambert-St Louis

Mon 3/2

2:00 pm-7:50 am

1 stop11h 50m

$619

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/27

6:00 am-3:24 pm

2 stops39h 24m

Lambert-St Louis

Fri 5/1

1:00 pm-10:00 am

1 stop15h 00m

$623

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/26

9:55 am-6:51 am

3 stops50h 56m

$365

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/26

Showing 1-10 of 18 results
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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 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 Expedia the most. Expedia 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 January 23, 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 $543). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of $814). 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 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 January 26, 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
9,199 reviews

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

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
9,199 reviews
United Airlines
7.4
Good
9,199 reviews

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

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
7,700 reviews
United Airlines
7.4
Good
9,199 reviews

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Entertainment

7.1

Overall

7.4

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 $605, United Airlines can have you in St. Louis from London Heathrow Airport in 18h 42m. 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 $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 $725, our data shows the cheapest flight currently is $438. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay $586 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 $543). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of $814). 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
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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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.
Heathrow to Kansas City flights
Gatwick to St. Louis flights
Gatwick to Kansas City flights
Stansted to Kansas City flights
Heathrow to Springfield flights

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 January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$555Average$874FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$654Average$1,162FlexibilityNo cancel feeOn-time69%

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