Heathrow

$351+ Cheap flights from St. Louis (STL) to Heathrow (LHR)

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 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Feb 18 — Feb 251
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Find cheap flights from St. Louis to Heathrow with Cheapflights

1. Tell us where you want to go
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The best prices from Lambert-St Louis to London Heathrow are usually found in October or March, booked 41 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from St. Louis to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Heathrow (LHR). 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 February 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$687
(Air Canada)

One-way from

$351
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$985
Provider with most accurate pricing for Lambert-St Louis-London Heathrow flight deals.
Provider most trusted by Cheapflights users for Lambert-St Louis-London Heathrow flights.
From Lambert-St Louis to London Heathrow
One-way flight from Lambert-St Louis to London Heathrow
Highest demand for flights based on searches. 15% potential increase in price ($175 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
Average for round-trip flights in February 2025

Find flight deals from St. Louis to Heathrow

Cheapest flights from St. Louis to Heathrow
Explore the most affordable flight options available from St. Louis to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 13, 2025.

This Air Canada deal was found by Cheapflights users on 2/12. 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.
Mon 3/175:33 pmSTL - LHR
2 stops13h 17mAir Canada
Wed 3/266:00 pmLHR - STL
2 stops26h 31mAir Canada
Deal found 2/12$687
This oojo deal was found by Cheapflights users on 2/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/134:12 pmSTL - LHR
1 stop12h 38mBritish Airways
Mon 10/207:10 pmLHR - STL
2 stops28h 53mBritish Airways
Deal found 2/12$688
This SmartFares deal was found by Cheapflights users on 2/13. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2410:59 amSTL - LHR
2 stops24h 41mScandinavian Airlines
Wed 3/56:40 amLHR - STL
2 stops22h 56mScandinavian Airlines
Deal found 2/13$690
This United Airlines deal was found by Cheapflights users on 2/12. 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 2/263:32 pmSTL - LHR
2 stops13h 33mUnited Airlines
Wed 3/56:50 amLHR - STL
2 stops14h 50mUnited Airlines
Deal found 2/12$691
This Air Canada deal was found by Cheapflights users on 2/12. 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.
Tue 5/61:30 pmSTL - LHR
1 stop11h 00mMultiple Airlines
Wed 5/1410:30 amLHR - STL
2 stops15h 31mMultiple Airlines
Deal found 2/12$693
This Lufthansa deal was found by Cheapflights users on 2/12. 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.
Sun 3/23:45 pmSTL - LHR
1 stop13h 00mLufthansa
Sat 3/87:30 pmLHR - STL
1 stop24h 25mLufthansa
Deal found 2/12$757
This Delta deal was found by Cheapflights users on 2/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2010:45 amSTL - LHR
2 stops14h 30mDelta
Thu 6/58:40 amLHR - STL
2 stops17h 53mDelta
Deal found 2/13$767
This Cheapflightsfares deal was found by Cheapflights users on 2/13. 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.
Fri 4/2512:00 pmSTL - LHR
1 stop13h 25mIberia
Sun 5/42:25 pmLHR - STL
1 stop13h 47mIberia
Deal found 2/13$768
This Virgin Atlantic deal was found by Cheapflights users on 2/12. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/12:18 pmSTL - LHR
2 stops13h 57mVirgin Atlantic
Sat 9/209:40 amLHR - STL
2 stops17h 07mVirgin Atlantic
Deal found 2/12$808
This KLM deal was found by Cheapflights users on 2/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/207:10 pmSTL - LHR
1 stop11h 30mKLM
Tue 3/2512:20 pmLHR - STL
1 stop14h 20mKLM
Deal found 2/12$955

Find flights from St. Louis to Heathrow within your budget

Customize your flight search to find flights from St. Louis to Heathrow 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 February 13, 2025.

Fly from

St. Louis

Fly to

Heathrow

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/17

5:33 pm-11:50 am

2 stops13h 17m

London Heathrow

Wed 3/26

6:00 pm-3:31 pm

2 stops26h 31m

$687

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 2/24

10:59 am-5:40 pm

2 stops24h 41m

London Heathrow

Wed 3/5

6:40 am-11:36 pm

2 stops22h 56m

$690

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 2/26

3:32 pm-11:05 am

2 stops13h 33m

London Heathrow

Wed 3/5

6:50 am-3:40 pm

2 stops14h 50m

$691

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/6

1:30 pm-6:30 am

1 stop11h 00m

London Heathrow

Wed 5/14

10:30 am-8:01 pm

2 stops15h 31m

$693

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/6

7:05 pm-2:25 pm

1 stop13h 20m

London Heathrow

Wed 5/14

2:25 pm-9:52 pm

1 stop13h 27m

$704

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 3/2

3:45 pm-10:45 am

1 stop13h 00m

London Heathrow

Sat 3/8

7:30 pm-1:55 pm

1 stop24h 25m

$757

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 4/25

12:00 pm-7:25 am

1 stop13h 25m

London Heathrow

Sun 5/4

2:25 pm-10:12 pm

1 stop13h 47m

$768

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 3/20

10:19 am-6:25 am

2 stops15h 06m

London Heathrow

Tue 3/25

10:10 am-11:03 pm

2 stops17h 53m

$772

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 3/20

7:10 pm-11:40 am

1 stop11h 30m

London Heathrow

Tue 3/25

12:20 pm-9:40 pm

1 stop14h 20m

$955

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/10

6:10 am-12:50 pm

3 stops25h 40m

London Heathrow

Sun 3/16

2:50 pm-8:52 pm

3 stops35h 02m

$1,048

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/13

Showing 1-10 of 20 results
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Compare providers for flights from St. Louis to Heathrow

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 St. Louis to Heathrow in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star
OvagoPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust 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 St. Louis-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-London Heathrow Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-London Heathrow Airport 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 St. Louis-London Heathrow Airport 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 St. Louis to Heathrow

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

Travel insights for flights from St. Louis to Heathrow

Get recent, data-driven insights about flights from St. Louis to Heathrow including ideal travel times, pricing trends, and more.

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Heathrow. Price data was last updated on February 7, 2025.

To ensure you get the cheapest price possible for a flight from St. Louis to London Heathrow Airport, you should look to book at least 41 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.