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St. Louis

$441+ 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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — STL
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 March, booked 26 days in advance, depart on a Thursday or Wednesday and return on a Thursday

Cheap 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 September 11, 2025.

Round-trip from

$805
(Scandinavian Airlines)

One-way from

$441
(Kiwi.com)

Popular in

August

Cheapest in

February

Average price

$890
From London Heathrow to Lambert-St Louis
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One-way flight from London Heathrow to Lambert-St Louis
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Highest demand for flights based on searches. 7% potential increase in price ($82 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This Scandinavian Airlines deal was found by Cheapflights users on 9/10. 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.
Mon 11/246:40 amLHR - STL
2 stops21h 18mScandinavian Airlines
Mon 12/11:55 pmSTL - LHR
2 stops25h 45mScandinavian Airlines
Deal found 9/10$805
This Scandinavian Airlines deal was found by Cheapflights users on 9/11. 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.
Thu 11/67:05 amLHR - STL
3 stops20h 33mScandinavian Airlines
Mon 11/1011:44 amSTL - LHR
2 stops22h 16mScandinavian Airlines
Deal found 9/11$807
This Scandinavian Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/319:05 pmLHR - STL
3 stops29h 59mScandinavian Airlines
Thu 11/1311:44 amSTL - LHR
2 stops27h 56mScandinavian Airlines
Deal found 9/9$812
This Scandinavian Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/246:40 amLHR - STL
2 stops20h 48mScandinavian Airlines
Fri 10/315:15 pmSTL - LHR
2 stops17h 45mScandinavian Airlines
Deal found 9/9$851
This TravelUp deal was found by Cheapflights users on 9/9. 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 12/36:30 amLHR - STL
1 stop13h 25mLufthansa
Thu 1/151:00 pmSTL - LHR
1 stop11h 40mLufthansa
Deal found 9/9$854
This ChecknFly deal was found by Cheapflights users on 9/10. 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 10/86:50 amLHR - STL
2 stops19h 07mAir Canada
Wed 10/151:30 pmSTL - LHR
1 stop11h 00mAir Canada
Deal found 9/10$859
This Travcart deal was found by Cheapflights users on 9/10. 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.
Wed 10/811:45 amLHR - STL
1 stop11h 44mVirgin Atlantic
Wed 10/151:40 pmSTL - LHR
1 stop11h 35mVirgin Atlantic
Deal found 9/10$861
This Kiwi.com deal was found by Cheapflights users on 9/9. 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.
Fri 10/316:00 amLHR - STL
2 stops22h 42mAustrian Airlines
Thu 11/1311:49 amSTL - LHR
1 stop17h 16mAustrian Airlines
Deal found 9/9$867
This Lufthansa deal was found by Cheapflights users on 9/9. 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.
Fri 10/316:30 amLHR - STL
1 stop13h 25mMultiple Airlines
Thu 11/1311:49 amSTL - LHR
1 stop14h 36mMultiple Airlines
Deal found 9/9$869
This Lufthansa deal was found by Cheapflights users on 9/10. 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.
Fri 10/316:30 amLHR - STL
1 stop13h 25mLufthansa
Thu 11/131:10 pmSTL - LHR
1 stop11h 30mLufthansa
Deal found 9/10$871
This TravelUp deal was found by Cheapflights users on 9/11. 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.
Thu 11/67:30 pmLHR - STL
1 stop24h 25mLufthansa
Mon 11/106:43 pmSTL - LHR
1 stop10h 32mLufthansa
Deal found 9/11$873

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 September 11, 2025.
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

Mon 11/24

6:40 am-9:58 pm

2 stops21h 18m

Lambert-St Louis

Mon 12/1

1:55 pm-9:40 pm

2 stops25h 45m

$805

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 11/6

7:05 am-9:38 pm

3 stops20h 33m

Lambert-St Louis

Mon 11/10

11:44 am-4:00 pm

2 stops22h 16m

$807

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 10/31

9:05 pm-10:04 pm

3 stops29h 59m

Lambert-St Louis

Thu 11/13

11:44 am-9:40 pm

2 stops27h 56m

$812

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 10/24

6:40 am-9:28 pm

2 stops20h 48m

Lambert-St Louis

Fri 10/31

5:15 pm-4:00 pm

2 stops17h 45m

$851

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 12/3

6:30 am-1:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 1/15

1:00 pm-6:40 am

1 stop11h 40m

$854

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 10/8

11:45 am-5:29 pm

1 stop11h 44m

Lambert-St Louis

Wed 10/15

1:40 pm-7:15 am

1 stop11h 35m

$861

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 10/31

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 11/13

11:49 am-8:25 am

1 stop14h 36m

$869

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 10/31

6:30 am-2:55 pm

1 stop13h 25m

Lambert-St Louis

Thu 11/13

1:10 pm-6:40 am

1 stop11h 30m

$871

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 11/2

8:30 am-7:39 pm

2 stops17h 09m

Lambert-St Louis

Sun 11/9

8:00 am-5:55 am

1 stop15h 55m

$875

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/9

7:30 am-5:25 pm

2 stops15h 55m

Lambert-St Louis

Fri 1/16

9:57 am-5:55 am

1 stop13h 58m

$875

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 17 results
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 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 August 29, 2025.

The best time to book flights from London Heathrow Airport to St. Louis is 26 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of $311). Flying from London Heathrow Airport to St. Louis in March is currently the most expensive (average of $356). 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 September 11, 2025.

It’s optimal to fly from London Heathrow Airport to St. Louis at noon. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight in the morning.

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 September 11, 2025.
Peruse reviews from past customers who have flown with United Airlines, Lufthansa, 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
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
Lufthansa
6.8
Okay
7,409 reviews
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
British Airways
6.7
Okay
7,361 reviews
United Airlines
7.4
Good
8,937 reviews

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

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 3 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 $805, Scandinavian Airlines can have you in St. Louis from London Heathrow Airport in 21h 18m. 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. Other airlines that can offer you cheap pricing are Lufthansa, from $925, and United Airlines, from $952. You may be able to fly from London Heathrow Airport to St. Louis for 42% less than the average price by searching for these airlines.

  • 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, August is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of $311). Flying from London Heathrow Airport to St. Louis in March is currently the most expensive (average of $356). 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
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
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 Kansas City flights
Gatwick to St. Louis flights
Heathrow to Springfield flights
Stansted to Kansas City flights

Top 3 airlines flying from Heathrow to St. Louis

Discover the top 3 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$555Average$1,063FlexibilityNo cancel feeOn-time70%
LufthansaCheapest$925Average$925FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$952Average$1,220FlexibilityNo cancel feeOn-time69%

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