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Heathrow

$276+ 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 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
Feb 7 — Feb 141
Sat 2/7
Sat 2/14
1 adult, Economy
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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 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$654
(United Airlines)

One-way from

$276
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$842

Good round-trip deal

$688 or less

Good one-way deal

$459 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
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Highest demand for flights based on searches. 22% potential increase in price ($243 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Price to beat on a round-trip flight from Lambert-St Louis to London Heathrow.
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Price to beat on a one-way flight from Lambert-St Louis to London Heathrow.
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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 8, 2026.

This SmartFares deal was found by Cheapflights users on 1/7. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/214:05 pmSTL - LHR
1 stop32h 25mMultiple Airlines
Sat 2/287:30 pmLHR - STL
1 stop24h 25mMultiple Airlines
Deal found 1/7$655
This Orbitz deal was found by Cheapflights users on 1/6. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:00 pmSTL - LHR
Nonstop8h 05mBritish Airways
Mon 11/29:55 amLHR - STL
1 stop13h 59mBritish Airways
Deal found 1/6$656
This Delta deal was found by Cheapflights users on 1/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/59:59 amSTL - LHR
2 stops16h 46mDelta
Thu 2/126:20 amLHR - STL
2 stops16h 25mDelta
Deal found 1/6$657
This Air Canada deal was found by Cheapflights users on 1/7. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/11:00 pmSTL - LHR
1 stop15h 00mAir Canada
Fri 5/158:40 amLHR - STL
2 stops17h 25mAir Canada
Deal found 1/7$658
This Delta deal was found by Cheapflights users on 1/7. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/96:57 pmSTL - LHR
1 stop10h 43mDelta
Mon 2/2310:45 amLHR - STL
1 stop12h 57mDelta
Deal found 1/7$659
This United Airlines deal was found by Cheapflights users on 1/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/178:55 amSTL - LHR
2 stops15h 35mUnited Airlines
Tue 8/256:30 amLHR - STL
1 stop12h 55mUnited Airlines
Deal found 1/7$660
This British Airways deal was found by Cheapflights users on 1/7. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/132:29 pmSTL - LHR
1 stop11h 11mBritish Airways
Mon 4/2012:15 pmLHR - STL
1 stop12h 12mBritish Airways
Deal found 1/7$661
This CheapOair deal was found by Cheapflights users on 1/8. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/127:41 amSTL - LHR
2 stops18h 29mAir Canada
Tue 3/176:00 pmLHR - STL
1 stop26h 29mAir Canada
Deal found 1/8$662
This Virgin Atlantic deal was found by Cheapflights users on 1/7. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/110:19 amSTL - LHR
2 stops14h 31mVirgin Atlantic
Sun 2/151:00 pmLHR - STL
2 stops16h 23mVirgin Atlantic
Deal found 1/7$663
This oojo deal was found by Cheapflights users on 1/6. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:00 amSTL - LHR
1 stop22h 30mBritish Airways
Fri 4/242:45 pmLHR - STL
1 stop13h 29mBritish Airways
Deal found 1/6$664
This United Airlines deal was found by Cheapflights users on 1/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/37:45 amSTL - LHR
2 stops16h 50mUnited Airlines
Wed 5/136:30 amLHR - STL
1 stop12h 55mUnited Airlines
Deal found 1/7$665
This British Airways deal was found by Cheapflights users on 1/7. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/159:45 amSTL - LHR
1 stop27h 10mBritish Airways
Sun 8/2310:05 amLHR - STL
1 stop14h 13mBritish Airways
Deal found 1/7$666

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 8, 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

Fri 2/20

6:35 am-7:05 am

2 stops18h 30m

London Heathrow

Fri 2/27

6:20 am-5:42 pm

2 stops17h 22m

$657

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/6

11:25 am-7:55 am

1 stop14h 30m

London Heathrow

Fri 3/13

1:00 pm-3:29 pm

1 stop31h 29m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 3/6

6:35 am-7:05 am

2 stops18h 30m

London Heathrow

Fri 3/13

6:30 am-5:53 pm

2 stops16h 23m

$658

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 5/4

2:29 pm-7:40 am

1 stop11h 11m

London Heathrow

Sun 5/10

12:15 pm-6:27 pm

1 stop12h 12m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/13

2:29 pm-7:40 am

1 stop11h 11m

London Heathrow

Sun 4/26

9:45 am-4:16 pm

1 stop12h 31m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 5/7

7:05 am-6:50 am

1 stop17h 45m

London Heathrow

Tue 5/12

12:15 pm-6:27 pm

1 stop12h 12m

$661

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 2/4

11:23 am-8:45 am

2 stops15h 22m

London Heathrow

Sat 2/21

1:05 pm-11:23 pm

2 stops16h 18m

$663

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 4/28

9:10 am-6:30 am

2 stops15h 20m

London Heathrow

Wed 5/6

6:30 am-9:04 pm

2 stops20h 34m

$671

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 4/24

11:43 am-10:20 am

2 stops16h 37m

London Heathrow

Tue 4/28

6:15 am-5:54 pm

2 stops17h 39m

$673

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 5/4

11:43 am-7:15 am

2 stops13h 32m

London Heathrow

Mon 5/11

11:30 am-11:01 pm

2 stops17h 31m

$673

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

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 Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy2 starsTrust Score*2 stars
AranGrantPrice Accuracy2 starsTrust Score*3 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 January 2, 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 $493). 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.

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 8, 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
9,142 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
United Airlines
7.4
Good
9,142 reviews
United Airlines
7.4
Good
9,142 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
American Airlines
7.2
Good
11,097 reviews
United Airlines
7.4
Good
9,142 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
Air Canada
7.1
Good
10,603 reviews
United Airlines
7.4
Good
9,142 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
Iberia
7.0
Good
3,079 reviews
United Airlines
7.4
Good
9,142 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.
British Airways
6.7
Okay
7,659 reviews
United Airlines
7.4
Good
9,142 reviews

Crew

8.1

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

IAD - TYS

It was a short flight on a small express plane, so no time for amenities. Quickly on, quickly off. No complaints.

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, United Airlines, and British Airways can get you from St. Louis to London Heathrow Airport in just under 11h 11m. Your travel time can differ by up to 7h 19m. 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 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 $824, our data shows the cheapest flight currently is $242. When looking at the most popular route, (Lambert-St Louis - London Heathrow), you can expect to pay $569 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 $493). 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
Eastleigh
Gatwick
Dartford
Dover
Winchester
Croydon
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames

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 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$529Average$736FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$573Average$962FlexibilityNo cancel feeOn-time67%
DeltaCheapest$577Average$868FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$580Average$860FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$580Average$855FlexibilityNo cancel feeOn-time70%
IberiaCheapest$597Average$989FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$602Average$1,102FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$604Average$877FlexibilityNo cancel feeOn-time71%
Virgin AtlanticCheapest$615Average$947FlexibilityNo cancel feeOn-time72%
LufthansaCheapest$668Average$888FlexibilityNo cancel feeOn-time76%

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