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Heathrow

$320+ 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Aug 22 — Aug 291
Sat 8/22
Sat 8/29
1 adult, Economy
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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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Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or April, booked 50 days in advance, depart on a Thursday or Monday and return on a Monday

Cheap 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 July 23, 2026.

This Gotogate deal was found by Cheapflights users on 7/21. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/104:05 pm
STL
-
LHR
1 stop10h 25m
Air Canada
Mon 12/146:00 pm
LHR
-
STL
1 stop27h 26m
Air Canada
Deal found 7/21$964
This United Airlines deal was found by Cheapflights users on 7/22. 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 10/1112:10 pm
STL
-
LHR
1 stop12h 20m
United Airlines
Tue 11/31:35 pm
LHR
-
STL
1 stop13h 38m
United Airlines
Deal found 7/22$965
This Thrive Travel deal was found by Cheapflights users on 7/21. 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 Thrive Travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/239:40 pm
STL
-
LHR
Nonstop8h 00m
Aer Lingus
Tue 9/111:10 am
LHR
-
STL
1 stop14h 17m
Aer Lingus
Deal found 7/21$966
This Cheapflightsfares deal was found by Cheapflights users on 7/21. 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.
Wed 10/71:29 pm
STL
-
LHR
2 stops17h 11m
Lufthansa
Mon 10/127:30 pm
LHR
-
STL
2 stops31h 51m
Lufthansa
Deal found 7/21$967
This Virgin Atlantic deal was found by Cheapflights users on 7/23. 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.
Thu 12/311:51 am
STL
-
LHR
2 stops12h 59m
Virgin Atlantic
Mon 12/76:30 am
LHR
-
STL
2 stops15h 28m
Virgin Atlantic
Deal found 7/23$969
This Travelocity deal was found by Cheapflights users on 7/22. 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.
Sun 11/154:26 pm
STL
-
LHR
1 stop10h 49m
Multiple Airlines
Sat 11/2811:10 am
LHR
-
STL
2 stops16h 03m
Multiple Airlines
Deal found 7/22$970
This KAYAK deal was found by Cheapflights users on 7/22. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/131:29 pm
STL
-
LHR
2 stops21h 11m
Lufthansa
Mon 11/27:15 pm
LHR
-
STL
2 stops31h 58m
Lufthansa
Deal found 7/22$971
This Delta deal was found by Cheapflights users on 7/22. 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.
Sat 10/102:00 pm
STL
-
LHR
1 stop24h 10m
Delta
Fri 11/612:30 pm
LHR
-
STL
1 stop13h 16m
Delta
Deal found 7/22$972
This Gotogate deal was found by Cheapflights users on 7/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/212:10 pm
STL
-
LHR
1 stop12h 20m
Multiple Airlines
Fri 10/96:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 7/22$973
This Gotogate deal was found by Cheapflights users on 7/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:10 pm
STL
-
LHR
1 stop15h 50m
Multiple Airlines
Tue 9/226:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 7/20$974
This Gotogate deal was found by Cheapflights users on 7/22. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2112:10 pm
STL
-
LHR
1 stop12h 20m
Multiple Airlines
Tue 8/256:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 7/22$975
This Gotogate deal was found by Cheapflights users on 7/18. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:55 am
STL
-
LHR
1 stop17h 40m
Multiple Airlines
Sun 9/66:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 7/18$976

Find 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 July 23, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$964
(Gotogate)

One-way from

$320
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,304

Good round-trip deal

$1,059 or less

Good one-way deal

$491 or less
Provider with most accurate pricing for Lambert-St Louis-London Heathrow flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-London Heathrow flights.
Search Deals
From Lambert-St Louis to London Heathrow
Search Deals
One-way flight from Lambert-St Louis to London Heathrow
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($339 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($48 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to London Heathrow.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
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 July 23, 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 9/4

6:15 am-7:55 am

1 stop19h 40m

London Heathrow

Fri 9/11

6:50 am-3:38 pm

2 stops14h 48m

$986

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 10/30

2:25 pm-6:25 am

1 stop11h 00m

London Heathrow

Mon 11/9

8:55 am-3:58 pm

1 stop13h 03m

$997
Quickest round-trip

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/7

9:35 pm-11:35 am

Nonstop8h 00m

London Heathrow

Thu 10/15

12:15 pm-9:08 pm

1 stop14h 53m

$997

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 8/19

9:15 am-7:10 am

2 stops15h 55m

London Heathrow

Sun 8/23

6:15 am-5:53 pm

2 stops17h 38m

$998

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 8/27

11:15 am-7:45 am

1 stop14h 30m

London Heathrow

Mon 8/31

3:30 pm-1:25 pm

1 stop27h 55m

$1,007

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 10/7

8:30 am-11:55 am

3 stops21h 25m

London Heathrow

Thu 10/15

9:25 pm-11:45 pm

2 stops32h 20m

$1,012

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 9/19

10:40 am-10:20 am

2 stops17h 40m

London Heathrow

Sat 9/26

6:30 am-4:32 pm

2 stops16h 02m

$1,042

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 9/17

10:29 am-6:45 am

2 stops14h 16m

London Heathrow

Sat 9/26

6:30 am-4:32 pm

2 stops16h 02m

$1,042

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 9/19

4:50 pm-8:40 pm

1 stop21h 50m

London Heathrow

Sat 9/26

9:30 am-1:25 pm

1 stop33h 55m

$1,046

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 8/11

9:15 am-7:10 am

2 stops15h 55m

London Heathrow

Fri 8/21

6:30 am-4:17 pm

2 stops15h 47m

$1,052

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/18

Showing 1-10 of 21 resultsSorted by cheapest first
1
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3

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 July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
BusinessClassPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star

*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 Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. Ovago >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 Ovago the most. Ovago 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to London Heathrow Airport

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

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 49 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, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $653). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,445). 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 July 23, 2026.

When flying from St. Louis to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from St. Louis to London Heathrow Airport?

Airfare is typical for this route at the moment.

St. Louis to London Heathrow Airport flights typically cost between $898 and $1,280 in December.
The cheapest round-trip price found within the last 5 days was $964 on Air Canada (Dec 10-Dec 14).

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 July 23, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines from St. Louis to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,480 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,480 reviews
Delta
7.8
Good
8,480 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
10,024 reviews
Delta
7.8
Good
8,480 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
American Airlines
7.1
Good
11,832 reviews
Delta
7.8
Good
8,480 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Air Canada
7.1
Good
11,371 reviews
Delta
7.8
Good
8,480 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
British Airways
6.7
Okay
8,127 reviews
Delta
7.8
Good
8,480 reviews

Crew

8.5

Comfort

7.8

Entertainment

7.8

Overall

7.8

Food

7.2

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 2 daily outbound flights to London Heathrow from 8 different airlines.

  • How long is the flight from St. Louis to London Heathrow Airport?

    United Airlines, Delta, and British Airways can get you from St. Louis to London Heathrow Airport in just under 8h. Your travel time can differ by up to 11h 40m. Airlines will cover 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 St. Louis to London Heathrow Airport round-trip?

    According to our current data, Delta ($483), Iberia ($529), and KLM ($529) offers the cheapest pricing from St. Louis to London Heathrow Airport. Delta is 47% 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 Iberia. According to our data, you can fly for as low as $317. Users have also found prices from $379 and $394 on British Airways and American Airlines, respectively.

  • What are the most reliable airlines from St. Louis to London Heathrow Airport?

    Before booking your flight to London Heathrow Airport from St. Louis, check out the most reliable airlines to get you to your destination on time: American Airlines (65%), Aer Lingus (65%), Finnair( 65%).

  • What are the cheapest flights from St. Louis to London Heathrow Airport?

    While on average a flight from St. Louis to London Heathrow Airport is generally $1,693, our data shows the cheapest flight currently is $322. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay $833 for that flight.

  • 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, October is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $653). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,445). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Ilford
Dorking
Hounslow
Winchester
Croydon
Gatwick
Wembley
Harrow
Eastleigh
Southend-on-Sea
Watford
Northampton
Dartford
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton

Browse thousands of different options on Cheapflights for your next trip

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Top 8 airlines flying from St. Louis to Heathrow

Discover the top 8 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 July 23, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$483Average$867FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$529Average$800FlexibilityNo cancel feeOn-time77%
KLMCheapest$529Average$788FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$532Average$905FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$572Average$962FlexibilityNo cancel feeOn-time67%
British AirwaysCheapest$579Average$1,031FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$580Average$813FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$635Average$962FlexibilityNo cancel feeOn-time76%

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