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$301+ 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 1/26. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Jan 22 — Jan 291
Wed 1/22
Wed 1/29
1 adult, Economy
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The best prices from Lambert-St Louis to London Heathrow are usually found in February or March, booked 21 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 January 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$734
(FlightHub)

One-way from

$316
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$964
Provider with most accurate pricing for Lambert-St Louis-London Heathrow flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-London Heathrow flights.
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From Lambert-St Louis to London Heathrow
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One-way flight from Lambert-St Louis to London Heathrow
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High demand for flights, 18% potential price rise
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Best time to find cheap flights, 3% potential price drop
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Average for round-trip flights in January 2025
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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 January 17, 2025.

This FlightHub deal was found by Cheapflights users on 1/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/263:50 pmSTL - LHR
1 stop10h 40mMultiple Airlines
Tue 2/117:30 pmLHR - STL
1 stop24h 25mMultiple Airlines
Deal found 1/16$734
This Justfly.com deal was found by Cheapflights users on 1/16. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/293:50 pmSTL - LHR
1 stop10h 40mAir Canada
Tue 2/43:00 pmLHR - STL
2 stops30h 06mAir Canada
Deal found 1/16$737
This Virgin Atlantic deal was found by Cheapflights users on 1/16. 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.
Wed 3/1910:30 amSTL - LHR
2 stops15h 35mVirgin Atlantic
Thu 4/1011:30 amLHR - STL
2 stops16h 06mVirgin Atlantic
Deal found 1/16$738
This Travelocity deal was found by Cheapflights users on 1/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/224:17 pmSTL - LHR
2 stops18h 58mIberia
Wed 10/11:10 pmLHR - STL
2 stops25h 54mIberia
Deal found 1/16$739
This Delta deal was found by Cheapflights users on 1/16. 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 4/221:41 pmSTL - LHR
2 stops14h 09mDelta
Wed 4/306:30 amLHR - STL
2 stops16h 20mDelta
Deal found 1/16$740
This KLM deal was found by Cheapflights users on 1/16. 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.
Sun 4/205:30 pmSTL - LHR
1 stop12h 45mKLM
Thu 5/111:45 amLHR - STL
1 stop14h 48mKLM
Deal found 1/16$742
This United Airlines deal was found by Cheapflights users on 1/15. 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.
Sat 10/115:18 pmSTL - LHR
2 stops31h 12mUnited Airlines
Tue 10/212:05 pmLHR - STL
3 stops31h 16mUnited Airlines
Deal found 1/15$744
This Lufthansa deal was found by Cheapflights users on 1/16. 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.
Mon 3/315:35 pmSTL - LHR
2 stops19h 05mLufthansa
Wed 4/96:30 amLHR - STL
1 stop13h 00mLufthansa
Deal found 1/16$759
This Cheapflightsfares deal was found by Cheapflights users on 1/16. 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 2/252:10 pmSTL - LHR
1 stop13h 10mBritish Airways
Mon 3/1011:00 amLHR - STL
1 stop16h 18mBritish Airways
Deal found 1/16$766
This Scandinavian Airlines deal was found by Cheapflights users on 1/16. 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.
Wed 2/52:00 pmSTL - LHR
3 stops21h 00mScandinavian Airlines
Fri 2/146:40 amLHR - STL
2 stops22h 57mScandinavian Airlines
Deal found 1/16$840
This FlightHub deal was found by Cheapflights users on 1/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/3111:28 amSTL - LHR
1 stop12h 52mAustrian Airlines
Sun 2/210:25 amLHR - STL
1 stop13h 11mAustrian Airlines
Deal found 1/16$1,058

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 January 17, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 1/29

3:50 pm-8:30 am

1 stop10h 40m

London Heathrow

Tue 2/4

3:00 pm-3:06 pm

2 stops30h 06m

$737

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 3/19

10:30 am-7:05 am

2 stops15h 35m

London Heathrow

Thu 4/10

11:30 am-9:36 pm

2 stops16h 06m

$738

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 5/3

5:31 pm-6:30 am

2 stops30h 59m

London Heathrow

Fri 5/16

2:05 pm-12:19 pm

2 stops28h 14m

$744

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 2/2

3:45 pm-3:45 pm

1 stop18h 00m

London Heathrow

Wed 2/12

6:30 am-1:55 pm

1 stop13h 25m

$751

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 1/26

5:15 pm-10:50 am

3 stops35h 35m

London Heathrow

Tue 2/11

12:15 pm-11:45 am

3 stops29h 30m

$754

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/6

6:23 pm-10:30 am

1 stop10h 07m

London Heathrow

Wed 5/14

10:05 am-8:14 pm

1 stop16h 09m

$756

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 2/27

2:10 pm-9:20 am

1 stop13h 10m

London Heathrow

Fri 3/21

1:50 pm-10:07 pm

1 stop13h 17m

$766

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 2/28

6:00 am-6:20 am

1 stop18h 20m

London Heathrow

Fri 3/7

6:30 am-6:01 pm

2 stops17h 31m

$796

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 3/13

2:21 pm-7:50 am

1 stop12h 29m

London Heathrow

Mon 3/24

10:05 am-5:52 pm

1 stop12h 47m

$839

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 1/29

11:04 am-5:40 pm

2 stops24h 36m

London Heathrow

Sat 2/1

5:00 pm-11:37 pm

2 stops36h 37m

$871

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/15

Showing 1-10 of 23 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 January.
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*3 stars
OvagoPrice 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 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 January 10, 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 21 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.

What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

Currently, November is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $661). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,137). 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 STL to LHR?

Find hourly flight availability from St. Louis to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 17, 2025.

One of the essential ways to save on airfare from St. Louis to London Heathrow Airport is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 11% on airfare.

What is the cheapest day to fly from St. Louis to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to London Heathrow Airport flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated January 17, 2025.
Get a feel of what it's like to fly with United Airlines, British Airways and Lufthansa from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
8,511 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Crew

8.6

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,511 reviews
Delta
8.0
Very good
8,511 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Crew

8.6

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM
7.8
Good
1,339 reviews
Delta
8.0
Very good
8,511 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Crew

8.6

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair
7.6
Good
1,285 reviews
Delta
8.0
Very good
8,511 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Crew

8.6

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines
7.6
Good
786 reviews
Delta
8.0
Very good
8,511 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Crew

8.6

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic
7.5
Good
664 reviews
Delta
8.0
Very good
8,511 reviews

Overall

8.0

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Crew

8.6

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Heathrow. 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 from for flights from St. Louis to London Heathrow?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to London Heathrow from St. Louis. Booking flights from Lambert-St Louis (STL) to London Heathrow should be relatively easy as there are 0 daily outbound flights to London Heathrow from 10 different airlines.

  • What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

    According to our current data, Air Canada ($737), Virgin Atlantic ($738), and Delta ($740) offers the cheapest pricing from St. Louis to London Heathrow Airport. Air Canada is 21% cheaper than the average price of flights available within the next 90 days to this destination.

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

    For one-way options, check prices for Scandinavian Airlines. According to our data, you can fly for as low as $368. Users have also found prices from $415 and $466 on WestJet and British Airways, respectively.

  • Can I find deals for flights from St. Louis to Heathrow that include hotel bookings?

    Yes. In addition to deals on St. Louis to Heathrow flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Heathrow.

  • Can I find deals for business class flights from St. Louis to Heathrow?

    Yes. Cheapflights offers flight deals from St. Louis to Heathrow 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 St. Louis to London Heathrow Airport?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $661). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,137). 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
Hayes
Hounslow
Thornton Heath
Harrow
Luton
Wembley
Canterbury
Northampton
Gatwick
Horley
Milton Keynes
Dover
Watford
Orpington
Stratford-upon-Avon
Croydon
Borehamwood
Bromley
Folkestone
Ilford

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from St. Louis to Heathrow

Discover the top 10 airlines that operate flights from St. Louis to Heathrow. 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$490Average$896FlexibilityNo cancel feeOn-time75%
IberiaCheapest$631Average$812FlexibilityNo cancel feeOn-time77%
Virgin AtlanticCheapest$654Average$838FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$664Average$943FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$673Average$884FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$678Average$1,042FlexibilityNo cancel feeOn-time71%
DeltaCheapest$692Average$903FlexibilityNo cancel feeOn-timeN/A
Air CanadaCheapest$728Average$963FlexibilityNo cancel feeOn-time67%
Air FranceCheapest$769Average$871FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$802Average$1,259FlexibilityNo cancel feeOn-time76%
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