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Heathrow

$277+ 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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
ene. 7 — ene. 141
mié. 1/7
mié. 1/14
1 adult, Economy
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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or November, booked 27 days in advance, depart on a Monday or Thursday and return on a Thursday

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 diciembre 8, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/6. 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.
jue. 12/116:42 pmSTL - LHR
1 stop10h 33mLufthansa
mar. 12/1610:25 amLHR - STL
1 stop12h 38mLufthansa
Deal found 12/6$658
This Expedia deal was found by Cheapflights users on 12/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/811:50 amSTL - LHR
2 stops14h 35mIberia
lun. 12/157:05 pmLHR - STL
2 stops31h 19mIberia
Deal found 12/7$662
This Expedia deal was found by Cheapflights users on 12/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/1112:49 pmSTL - LHR
1 stop12h 16mKLM
mar. 12/166:30 amLHR - STL
2 stops40h 05mKLM
Deal found 12/6$670
This Booking.com deal was found by Cheapflights users on 12/6. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/910:13 amSTL - LHR
1 stop15h 07mBritish Airways
vie. 12/1912:35 pmLHR - STL
1 stop18h 50mBritish Airways
Deal found 12/6$671
This Cheapflightsfares deal was found by Cheapflights users on 12/7. 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.
lun. 12/81:00 pmSTL - LHR
1 stop10h 55mMultiple Airlines
lun. 12/1510:25 amLHR - STL
1 stop12h 38mMultiple Airlines
Deal found 12/7$685
This Cheapflightsfares deal was found by Cheapflights users on 12/6. 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.
dom. 12/71:00 pmSTL - LHR
2 stops14h 45mLufthansa
dom. 12/141:35 pmLHR - STL
1 stop14h 05mLufthansa
Deal found 12/6$688
This Gotogate deal was found by Cheapflights users on 12/6. 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.
dom. 12/74:05 pmSTL - LHR
1 stop13h 15mMultiple Airlines
dom. 12/146:00 pmLHR - STL
1 stop27h 29mMultiple Airlines
Deal found 12/6$696
This Mytrip deal was found by Cheapflights users on 12/6. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/116:30 amSTL - LHR
2 stops18h 40mMultiple Airlines
mar. 12/167:25 amLHR - STL
1 stop15h 38mMultiple Airlines
Deal found 12/6$703
This oojo deal was found by Cheapflights users on 12/5. 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.
jue. 12/116:53 pmSTL - LHR
1 stop30h 27mBritish Airways
dom. 12/146:15 amLHR - STL
2 stops19h 15mBritish Airways
Deal found 12/5$708
This Virgin Atlantic deal was found by Cheapflights users on 12/6. 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.
jue. 12/1110:45 amSTL - LHR
2 stops14h 05mVirgin Atlantic
mar. 12/169:40 amLHR - STL
2 stops17h 07mVirgin Atlantic
Deal found 12/6$713

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 diciembre 8, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$656
(Cheapflightsfares)

One-way from

$277
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,000

Good round-trip deal

$675 or less

Good one-way deal

$280 or less
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
Search Deals
Highest demand for flights based on searches. 19% potential increase in price ($212 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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.
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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 diciembre 8, 2025.
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

jue. 12/11

6:42 pm-11:15 am

1 stop10h 33m

London Heathrow

mar. 12/16

10:25 am-5:03 pm

1 stop12h 38m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

vie. 2/6

6:40 pm-11:15 am

1 stop10h 35m

London Heathrow

mié. 2/11

6:30 am-10:58 pm

2 stops22h 28m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

dom. 2/1

6:40 pm-11:15 am

1 stop10h 35m

London Heathrow

dom. 2/8

8:30 am-10:58 pm

2 stops20h 28m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

dom. 1/18

11:20 am-7:10 am

2 stops13h 50m

London Heathrow

mié. 4/1

1:30 pm-10:59 pm

2 stops15h 29m

$667

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 12/11

12:49 pm-7:05 am

1 stop12h 16m

London Heathrow

mar. 12/16

6:30 am-4:35 pm

2 stops40h 05m

$670

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 1/15

12:44 pm-10:50 am

1 stop16h 06m

London Heathrow

lun. 1/26

6:30 pm-5:43 pm

2 stops29h 13m

$679

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

dom. 1/18

12:00 pm-6:55 am

2 stops12h 55m

London Heathrow

mié. 4/1

10:55 am-8:41 pm

2 stops15h 46m

$686

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

vie. 1/30

6:40 pm-11:15 am

1 stop10h 35m

London Heathrow

mar. 2/3

6:50 am-5:43 pm

2 stops16h 53m

$687

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 2/5

6:40 pm-11:15 am

1 stop10h 35m

London Heathrow

vie. 2/13

6:35 am-5:45 pm

2 stops17h 10m

$687

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 1/15

8:05 am-11:15 am

1 stop21h 10m

London Heathrow

mar. 1/20

6:50 am-7:27 pm

2 stops18h 37m

$687

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 21 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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 December 5, 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 27 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, September is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $530). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,001). 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 diciembre 8, 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 23% 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 Monday 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.

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 diciembre 8, 2025.
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
9,084 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
United Airlines
7.4
Good
9,084 reviews
United Airlines
7.4
Good
9,084 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
American Airlines
7.2
Good
11,045 reviews
United Airlines
7.4
Good
9,084 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
Air Canada
7.1
Good
10,513 reviews
United Airlines
7.4
Good
9,084 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
Iberia
7.0
Good
3,042 reviews
United Airlines
7.4
Good
9,084 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.
British Airways
6.7
Okay
7,569 reviews
United Airlines
7.4
Good
9,084 reviews

Boarding

7.7

Crew

8.1

Overall

7.4

Entertainment

7.1

Food

6.6

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Sunderesh,Dec 2025

AUS - EWR

Smooth flight from Austin to Newark. The crew was friendly.

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?

    Lufthansa and United Airlines can get you from St. Louis to London Heathrow Airport in just under 10h 33m. Your travel time can differ by up to 3h 17m. 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), Air Canada ($573), and Delta ($577) offers the cheapest pricing from St. Louis to London Heathrow Airport. KLM is 40% 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 $734, our data shows the cheapest flight currently is $278. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay $574 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, September is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of $530). Flying from St. Louis to London Heathrow Airport in June is currently the most expensive (average of $1,001). 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
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Wembley

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 diciembre 8, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$529Average$736FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$573Average$945FlexibilityNo cancel feeOn-time67%
DeltaCheapest$577Average$870FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$580Average$867FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$580Average$864FlexibilityNo cancel feeOn-time70%
IberiaCheapest$597Average$971FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$602Average$987FlexibilityNo cancel feeOn-time77%
Virgin AtlanticCheapest$615Average$947FlexibilityNo cancel feeOn-time72%
American AirlinesCheapest$634Average$890FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$670Average$898FlexibilityNo cancel feeOn-time76%

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