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Heathrow

$285+ 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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or November, booked 17 days in advance, depart on a Monday or Thursday 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 January 29, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 1/27. 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.
Sun 3/13:50 pm
STL
-
LHR
1 stop11h 55m
Lufthansa
Fri 3/136:30 am
LHR
-
STL
1 stop13h 25m
Lufthansa
Deal found 1/27$622
This Gotogate deal was found by Cheapflights users on 1/28. 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.
Wed 2/254:05 pm
STL
-
LHR
1 stop10h 25m
Multiple Airlines
Wed 3/46:30 am
LHR
-
STL
1 stop13h 25m
Multiple Airlines
Deal found 1/28$627
This Gotogate deal was found by Cheapflights users on 1/29. 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 9/221:30 pm
STL
-
LHR
1 stop11h 00m
Multiple Airlines
Tue 9/296:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 1/29$634
This Gotogate deal was found by Cheapflights users on 1/27. 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.
Wed 10/141:30 pm
STL
-
LHR
1 stop11h 00m
Multiple Airlines
Wed 10/216:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 1/27$635
This AirNGo deal was found by Cheapflights users on 1/28. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/236:47 pm
STL
-
LHR
1 stop10h 53m
Virgin Atlantic
Wed 3/410:00 am
LHR
-
STL
2 stops16h 43m
Virgin Atlantic
Deal found 1/28$637
This Gotogate deal was found by Cheapflights users on 1/28. 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.
Sun 5/31:00 pm
STL
-
LHR
1 stop11h 30m
Multiple Airlines
Fri 5/156:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 1/28$638
This Gotogate deal was found by Cheapflights users on 1/28. 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.
Wed 9/91:30 pm
STL
-
LHR
2 stops16h 20m
Multiple Airlines
Tue 9/226:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 1/28$639
This Gotogate deal was found by Cheapflights users on 1/28. 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 8/2512:10 pm
STL
-
LHR
1 stop15h 50m
Multiple Airlines
Tue 9/86:30 am
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Deal found 1/28$640
This Cheapflightsfares deal was found by Cheapflights users on 1/28. 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 10/143:30 pm
STL
-
LHR
1 stop20h 10m
Lufthansa
Wed 10/286:30 am
LHR
-
STL
1 stop13h 25m
Lufthansa
Deal found 1/28$642
This Delta deal was found by Cheapflights users on 1/27. 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.
Mon 2/99:59 am
STL
-
LHR
1 stop14h 26m
Delta
Wed 2/256:30 am
LHR
-
STL
2 stops20h 13m
Delta
Deal found 1/27$643

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$622
(Cheapflightsfares)

One-way from

$285
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$856

Good round-trip deal

$679 or less

Good one-way deal

$459 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. 21% potential increase in price ($236 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 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 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 January 29, 2026.
Use the filters below to find and compare flights from St. Louis to London Heathrow Airport that are best for you.

Fly from

St. Louis

Fly to

Heathrow

Route

Depart

Return

Price

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 3/28

1:00 pm-5:25 am

1 stop11h 25m

London Heathrow

Tue 4/7

6:30 am-2:24 pm

2 stops13h 54m

$649

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/21

6:15 am-6:30 am

2 stops18h 15m

London Heathrow

Thu 4/30

6:50 am-9:08 pm

2 stops20h 18m

$657

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 4/29

6:00 am-11:35 am

1 stop23h 35m

London Heathrow

Tue 5/5

6:50 am-9:08 pm

2 stops20h 18m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/13

9:59 am-6:45 am

1 stop14h 46m

London Heathrow

Tue 4/28

6:30 am-4:42 pm

2 stops16h 12m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/30

1:39 pm-7:10 am

1 stop11h 31m

London Heathrow

Tue 4/14

6:30 am-4:42 pm

2 stops16h 12m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/5

4:41 pm-12:05 pm

2 stops13h 24m

London Heathrow

Tue 5/19

9:55 am-8:31 pm

2 stops16h 36m

$660

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/27

11:15 am-6:55 am

2 stops13h 40m

London Heathrow

Fri 5/8

6:50 am-4:39 pm

2 stops15h 49m

$662

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 3/2

1:13 pm-8:05 am

1 stop12h 52m

London Heathrow

Thu 3/26

11:05 am-11:25 pm

1 stop17h 20m

$670

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sun 3/1

3:47 pm-9:00 am

1 stop11h 13m

London Heathrow

Wed 3/25

10:45 am-12:21 am

1 stop18h 36m

$670

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/27

7:45 am-11:45 am

1 stop22h 00m

London Heathrow

Tue 5/5

5:40 pm-12:06 pm

1 stop24h 26m

$672

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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
OvagoPrice Accuracy2 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
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 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.

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?

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 23, 2026.

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 17 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, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $517). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,000). 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.

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

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 29, 2026.
Get a feel of what it's like to fly with United Airlines, American Airlines, and Air Canada 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.
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,215 reviews
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
American Airlines
7.2
Good
11,206 reviews
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Air Canada
7.1
Good
10,667 reviews
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Iberia
7.0
Good
3,100 reviews
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
British Airways
6.7
Okay
7,705 reviews
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Crew

8.1

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

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.

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

    Delta and United Airlines can get you from St. Louis to London Heathrow Airport in just under 11h 25m. Your travel time can differ by up to 6h 50m. 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, KLM ($529), American Airlines ($565), and Air Canada ($573) offers the cheapest pricing from St. Louis to London Heathrow Airport. KLM is 38% 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 British Airways. According to our data, you can fly for as low as $397. Users have also found prices from $418 and $446 on Delta and American Airlines, respectively.

  • 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 $670, our data shows the cheapest flight currently is $315. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay $614 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, February is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $517). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,000). 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
Hounslow
Southend-on-Sea
Harrow
Croydon
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Watford
Northampton
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$529Average$788FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$565Average$878FlexibilityNo cancel feeOn-time71%
Air CanadaCheapest$573Average$969FlexibilityNo cancel feeOn-time67%
British AirwaysCheapest$575Average$835FlexibilityNo cancel feeOn-time70%
DeltaCheapest$577Average$907FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$580Average$852FlexibilityNo cancel feeOn-time69%
IberiaCheapest$597Average$986FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$602Average$1,102FlexibilityNo cancel feeOn-time77%
Virgin AtlanticCheapest$615Average$965FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$668Average$888FlexibilityNo cancel feeOn-time76%

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