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Heathrow

$283+ 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 7/21. Fares are subject to change and may not be available on all flights or dates of travel.
STL — LHR
jul. 8 — jul. 151
mar. 7/8
mar. 7/15
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 March, booked 11 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 julio 3, 2025.

Round-trip from

$725
(United Airlines)

One-way from

$283
(Mytrip)

Popular in

June

Cheapest in

October

Average price

$1,116
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. 15% potential increase in price ($177 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($31 potential savings vs. average RT price).
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Average for round-trip flights in July 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 julio 3, 2025.

This United Airlines deal was found by Cheapflights users on 7/3. 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.
mar. 9/168:10 amSTL - LHR
2 stops19h 25mUnited Airlines
sáb. 9/279:30 amLHR - STL
1 stop16h 27mUnited Airlines
Deal found 7/3$725
This Air Canada deal was found by Cheapflights users on 7/3. 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.
mié. 9/171:30 pmSTL - LHR
2 stops13h 05mAir Canada
sáb. 9/279:30 amLHR - STL
2 stops16h 08mAir Canada
Deal found 7/3$727
This Delta deal was found by Cheapflights users on 7/1. 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.
lun. 9/1511:04 amSTL - LHR
2 stops15h 46mDelta
mar. 1/1311:30 amLHR - STL
2 stops18h 10mDelta
Deal found 7/1$730
This Ovago deal was found by Cheapflights users on 7/3. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 8/2812:20 pmSTL - LHR
1 stop12h 05mBritish Airways
dom. 9/74:20 pmLHR - STL
2 stops34h 46mBritish Airways
Deal found 7/3$737
This Mytrip deal was found by Cheapflights users on 7/1. 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.
lun. 8/182:30 pmSTL - LHR
3 stops22h 20mMultiple Airlines
mié. 9/311:30 amLHR - STL
3 stops32h 05mMultiple Airlines
Deal found 7/1$738
This Virgin Atlantic deal was found by Cheapflights users on 7/2. 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.
vie. 8/13:59 pmSTL - LHR
1 stop15h 11mVirgin Atlantic
vie. 8/89:40 amLHR - STL
2 stops17h 54mVirgin Atlantic
Deal found 7/2$739
This Iberia deal was found by Cheapflights users on 7/1. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/193:08 pmSTL - LHR
1 stop33h 17mIberia
mar. 7/292:25 pmLHR - STL
1 stop15h 26mIberia
Deal found 7/1$740
This Lufthansa deal was found by Cheapflights users on 7/2. 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.
jue. 10/3012:31 pmSTL - LHR
2 stops17h 14mLufthansa
lun. 11/36:30 amLHR - STL
2 stops22h 17mLufthansa
Deal found 7/2$769

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 julio 3, 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

mar. 9/16

8:10 am-9:35 am

2 stops19h 25m

London Heathrow

sáb. 9/27

9:30 am-7:57 pm

1 stop16h 27m

$725

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 9/17

1:30 pm-8:35 am

2 stops13h 05m

London Heathrow

sáb. 9/27

9:30 am-7:38 pm

2 stops16h 08m

$727

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 9/15

11:04 am-8:50 am

2 stops15h 46m

London Heathrow

mar. 1/13

11:30 am-11:40 pm

2 stops18h 10m

$730

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 8/28

12:20 pm-6:25 am

1 stop12h 05m

London Heathrow

dom. 9/7

4:20 pm-9:06 pm

2 stops34h 46m

$737

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 8/18

2:30 pm-6:50 pm

3 stops22h 20m

London Heathrow

mié. 9/3

11:30 am-1:35 pm

3 stops32h 05m

$738

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

vie. 8/1

3:59 pm-1:10 pm

1 stop15h 11m

London Heathrow

vie. 8/8

9:40 am-9:34 pm

2 stops17h 54m

$739

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

sáb. 7/19

3:08 pm-6:25 am

1 stop33h 17m

London Heathrow

mar. 7/29

2:25 pm-11:51 pm

1 stop15h 26m

$740

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

jue. 10/30

12:31 pm-10:45 am

2 stops17h 14m

London Heathrow

lun. 11/3

6:30 am-10:47 pm

2 stops22h 17m

$769

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

lun. 7/21

10:47 am-10:00 pm

3 stops29h 13m

$283

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

mié. 10/1

1:30 pm-9:35 am

1 stop14h 05m

$394

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Showing 1-10 of 16 results
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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 June 27, 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 11 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 $1,098). 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 julio 3, 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.

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 julio 3, 2025.
Get a feel of what it's like to fly with Delta, KLM, and United 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
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,982 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,367 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,861 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
654 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air Canada
7.1
Good
9,681 reviews
Delta
8.0
Very good
7,982 reviews

Overall

8.0

Crew

8.5

Entertainment

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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, United Airlines ($725), Air Canada ($727), and Delta ($730) offers the cheapest pricing from St. Louis to London Heathrow Airport. United Airlines is 23% 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 Air Canada. According to our data, you can fly for as low as $394. Users have also found prices from $399 and $402 on United Airlines and Iberia, 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 $1,098). 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
Hounslow
Hayes
Thornton Heath
Canterbury
Harrow
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Folkestone
Borehamwood
Broadway
Aylesbury
Chelmsford
Brentwood
Chichester
Swindon

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 julio 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$669Average$1,102FlexibilityNo cancel feeOn-time77%
IberiaCheapest$671Average$981FlexibilityNo cancel feeOn-time77%
Air CanadaCheapest$691Average$960FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$699Average$977FlexibilityNo cancel feeOn-time69%
Virgin AtlanticCheapest$703Average$913FlexibilityNo cancel feeOn-time72%
British AirwaysCheapest$704Average$970FlexibilityNo cancel feeOn-time70%
DeltaCheapest$706Average$975FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$722Average$986FlexibilityNo cancel feeOn-time71%
LufthansaCheapest$725Average$1,085FlexibilityNo cancel feeOn-time76%
KLMCheapest$726Average$896FlexibilityNo cancel feeOn-time75%

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