What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

According to our current data, Iberia ($687), British Airways ($691), and Delta ($692) offers the cheapest pricing from St. Louis to London Heathrow Airport. Iberia is 27% 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 Aer Lingus. According to our data, you can fly for as low as $443. Users have also found prices from $451 and $453 on KLM and Iberia, respectively.

What is the cheapest day to fly from St. Louis to London Heathrow Airport?

Travelers seeking maximum savings on their St. Louis to London Heathrow Airport flight should consider departing on Wednesday 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.

What are the most popular airlines that fly from St. Louis to London Heathrow Airport?

The most popular airlines flying from St. Louis to London Heathrow Airport are American Airlines, Air Canada and British Airways. Something to consider prior to booking your flight.

What is the cheapest day to fly round-trip from St. Louis to London Heathrow Airport?

Flights from St. Louis to London Heathrow Airport are found to be more expensive on Thursday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to London Heathrow Airport.

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

Find a great deal and save up to 25% by booking at least 27 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from St. Louis to London Heathrow Airport within the next two weeks, with the cheapest ticket starting at $846.

What is the cheapest month to fly from St. Louis to London Heathrow Airport?

Flights from St. Louis to London Heathrow Airport lean towards being more expensive in June. Prices are generally better when you fly from St. Louis to London Heathrow Airport in April, with the cheapest ticket starting at $613.

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.

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.

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.

$443+ Flights from St. Louis to London Heathrow Airport

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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”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

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Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or September, booked 56 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from St. Louis to Heathrow

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$687 (Cheapflightsfares)
One-way from	$443 (StudentUniverse)
Popular in	June
Cheapest in	October
Average price	$828

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.

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. 15% potential increase in price ($169 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($25 potential savings vs. average RT price).

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Average for round-trip flights in March 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 March 25, 2025.

Mon 4/286:00 pmSTL - LHR

1 stop10h 30mIberia

Wed 5/712:15 pmLHR - STL

1 stop12h 18mIberia

Deal found 3/24

$687

Thu 5/81:30 pmSTL - LHR

1 stop14h 30mMultiple Airlines

Thu 5/1510:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 3/24

$688

Tue 5/131:38 pmSTL - LHR

1 stop16h 37mBritish Airways

Tue 5/205:20 pmLHR - STL

2 stops31h 13mBritish Airways

Deal found 3/24

$691

Sat 10/114:30 pmSTL - LHR

1 stop35h 10mUnited Airlines

Tue 10/215:40 pmLHR - STL

1 stop31h 53mUnited Airlines

Deal found 3/24

$692

Tue 5/1311:32 amSTL - LHR

1 stop19h 38mDelta

Thu 6/56:15 amLHR - STL

2 stops16h 45mDelta

Deal found 3/24

$695

Thu 5/157:30 amSTL - LHR

1 stop17h 05mAir Canada

Thu 5/228:40 amLHR - STL

2 stops17h 18mAir Canada

Deal found 3/24

$704

Sat 4/125:33 pmSTL - LHR

2 stops18h 07mLufthansa

Wed 4/236:30 amLHR - STL

1 stop13h 00mLufthansa

Deal found 3/24

$731

Mon 9/12:18 pmSTL - LHR

2 stops14h 12mVirgin Atlantic

Sun 9/711:45 amLHR - STL

2 stops17h 54mVirgin Atlantic

Deal found 3/24

$760

Wed 3/261:06 pmSTL - LHR

2 stops23h 34mScandinavian Airlines

Wed 4/25:00 pmLHR - STL

2 stops36h 29mScandinavian Airlines

Deal found 3/24

$795

Wed 4/211:55 amSTL - LHR

2 stops16h 25mAer Lingus

Wed 4/231:25 pmLHR - STL

2 stops16h 08mAer Lingus

Deal found 3/24

$860

Best flights from St. Louis to Heathrow
Discover carefully curated flight deals from St. Louis to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 25, 2025.

Mon 4/286:00 pmSTL - LHR

1 stop10h 30mIberia

Wed 5/712:15 pmLHR - STL

1 stop12h 18mIberia

Deal found 3/24

$687

Thu 5/81:30 pmSTL - LHR

1 stop14h 30mMultiple Airlines

Thu 5/1510:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 3/24

$688

Tue 5/131:38 pmSTL - LHR

1 stop16h 37mBritish Airways

Tue 5/205:20 pmLHR - STL

2 stops31h 13mBritish Airways

Deal found 3/24

$691

Wed 5/710:05 amSTL - LHR

1 stop19h 05mDelta

Wed 5/219:55 amLHR - STL

2 stops16h 44mDelta

Deal found 3/24

$692

Mon 4/289:39 amSTL - LHR

2 stops15h 16mUnited Airlines

Wed 5/78:40 amLHR - STL

2 stops16h 55mUnited Airlines

Deal found 3/24

$694

Thu 5/157:30 amSTL - LHR

1 stop17h 05mAir Canada

Thu 5/228:40 amLHR - STL

2 stops17h 18mAir Canada

Deal found 3/24

$704

Sat 4/125:33 pmSTL - LHR

2 stops18h 07mLufthansa

Wed 4/236:30 amLHR - STL

1 stop13h 00mLufthansa

Deal found 3/24

$731

Mon 9/12:18 pmSTL - LHR

2 stops14h 12mVirgin Atlantic

Sun 9/711:45 amLHR - STL

2 stops17h 54mVirgin Atlantic

Deal found 3/24

$760

Wed 4/2310:17 amSTL - LHR

2 stops16h 48mAer Lingus

Wed 4/301:25 pmLHR - STL

2 stops16h 08mAer Lingus

Deal found 3/24

$873

Mon 8/253:30 pmSTL - LHR

2 stops18h 30mScandinavian Airlines

Thu 9/47:05 amLHR - STL

3 stops19h 42mScandinavian Airlines

Deal found 3/24

$903

Last-minute flights from St. Louis to Heathrow
Discover last-minute flight deals from St. Louis to Heathrow. Data last updated March 25, 2025 and is based on user searches.

Wed 3/261:06 pmSTL - LHR

2 stops23h 34mScandinavian Airlines

Wed 4/25:00 pmLHR - STL

2 stops36h 29mScandinavian Airlines

Deal found 3/24

$795

Fri 3/284:45 pmSTL - LHR

1 stop13h 55mKLM

Tue 4/11:05 pmLHR - STL

1 stop16h 26mKLM

Deal found 3/25

$978

Wed 4/211:55 amSTL - LHR

2 stops16h 25mAer Lingus

Wed 4/231:25 pmLHR - STL

2 stops16h 08mAer Lingus

Deal found 3/24

$860

Wed 4/23:30 pmSTL - LHR

1 stop12h 05mMultiple Airlines

Wed 4/239:30 amLHR - STL

2 stops35h 19mMultiple Airlines

Deal found 3/24

$905

Thu 4/31:43 pmSTL - LHR

1 stop13h 57mUnited Airlines

Tue 4/82:05 pmLHR - STL

2 stops28h 15mUnited Airlines

Deal found 3/24

$960

Thu 4/31:48 pmSTL - LHR

2 stops14h 27mDelta

Mon 4/711:45 amLHR - STL

2 stops17h 44mDelta

Deal found 3/24

$1,023

Thu 4/31:05 pmSTL - LHR

2 stops23h 25mScandinavian Airlines

Mon 4/77:05 amLHR - STL

3 stops22h 24mScandinavian Airlines

Deal found 3/24

$2,562

Mon 4/73:40 pmSTL - LHR

2 stops24h 45mTurkish Airlines

Thu 4/106:30 pmLHR - STL

2 stops26h 12mTurkish Airlines

Deal found 3/25

$1,469

Sat 4/125:33 pmSTL - LHR

2 stops18h 07mLufthansa

Wed 4/236:30 amLHR - STL

1 stop13h 00mLufthansa

Deal found 3/24

$731

Fri 4/1810:17 amSTL - LHR

1 stop19h 58mBritish Airways

Wed 4/237:30 pmLHR - STL

2 stops26h 41mBritish Airways

Deal found 3/24

$735

Sun 4/203:30 pmSTL - LHR

1 stop33h 05mMultiple Airlines

Sat 5/310:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 3/24

$723

Sun 4/2011:15 amSTL - LHR

1 stop19h 55mDelta

Sun 4/276:30 amLHR - STL

2 stops16h 17mDelta

Deal found 3/24

$744

One-way flights from St. Louis to Heathrow
Search for one-way flight options from St. Louis to Heathrow. Find affordable one-way fares based on user searches. Data last updated March 25, 2025.

Mon 4/2112:00 pmSTL - LHR

2 stops14h 00mAer Lingus

Deal found 3/24

$443

Mon 4/215:34 pmSTL - LHR

1 stop13h 36mKLM

Deal found 3/24

$451

Thu 5/89:10 amSTL - LHR

1 stop16h 40mIberia

Deal found 3/23

$453

Thu 5/1510:10 amSTL - LHR

3 stops19h 45mMultiple Airlines

Deal found 3/24

$463

Fri 7/41:30 pmSTL - LHR

1 stop14h 30mUnited Airlines

Deal found 3/24

$464

Thu 5/89:40 amSTL - LHR

2 stops18h 20mAir Canada

Deal found 3/23

$465

Tue 6/36:45 amSTL - LHR

2 stops23h 20mWestJet

Deal found 3/24

$567

Tue 5/271:09 pmSTL - LHR

2 stops15h 51mDelta

Deal found 3/24

$828

Sat 6/77:20 amSTL - LHR

2 stops17h 00mBritish Airways

Deal found 3/23

$832

Wed 5/143:40 pmSTL - LHR

3 stops21h 10mScandinavian Airlines

Deal found 3/24

$3,620

Cheapflights Fare Finder

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

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/28

6:00 pm-10:30 am

1 stop10h 30m

London Heathrow

Wed 5/7

12:15 pm-6:33 pm

1 stop12h 18m

$687

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 5/8

1:30 pm-10:00 am

1 stop14h 30m

London Heathrow

Thu 5/15

10:30 am-7:58 pm

2 stops15h 28m

$688

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 5/13

1:38 pm-12:15 pm

1 stop16h 37m

London Heathrow

Tue 5/20

5:20 pm-6:33 pm

2 stops31h 13m

$691

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 5/7

10:05 am-11:10 am

1 stop19h 05m

London Heathrow

Wed 5/21

9:55 am-8:39 pm

2 stops16h 44m

$692

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 4/28

9:39 am-6:55 am

2 stops15h 16m

London Heathrow

Wed 5/7

8:40 am-7:35 pm

2 stops16h 55m

$694

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Thu 5/15

7:30 am-6:35 am

1 stop17h 05m

London Heathrow

Thu 5/22

8:40 am-7:58 pm

2 stops17h 18m

$704

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 4/12

5:33 pm-5:40 pm

2 stops18h 07m

London Heathrow

Wed 4/23

6:30 am-1:30 pm

1 stop13h 00m

$731

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 9/1

2:18 pm-10:30 am

2 stops14h 12m

London Heathrow

Sun 9/7

11:45 am-11:39 pm

2 stops17h 54m

$760

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 4/23

10:17 am-9:05 am

2 stops16h 48m

London Heathrow

Wed 4/30

1:25 pm-11:33 pm

2 stops16h 08m

$873

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 8/25

3:30 pm-4:00 pm

2 stops18h 30m

London Heathrow

Thu 9/4

7:05 am-8:47 pm

3 stops19h 42m

$903

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 20 results

Compare providers for flights from St. Louis to Heathrow

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 March.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*1 star
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Cheapflightsfares	Price Accuracy3 stars	Trust Score*2 stars
Ovago	Price Accuracy3 stars	Trust Score*3 stars
Cheapfaremart	Price Accuracy-	Trust Score*3 stars

*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?

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 56 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 $1,115). 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?

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.

Rainfall in Heathrow by month

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM and United Airlines from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,890 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,890 reviews

Delta

8.0

Very good

7,890 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,318 reviews

Delta

8.0

Very good

7,890 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,605 reviews

Delta

8.0

Very good

7,890 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic

7.4

Good

634 reviews

Delta

8.0

Very good

7,890 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Scandinavian Airlines

7.3

Good

1,325 reviews

Delta

8.0

Very good

7,890 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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, Iberia ($687), British Airways ($691), and Delta ($692) offers the cheapest pricing from St. Louis to London Heathrow Airport. Iberia is 27% 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 Aer Lingus. According to our data, you can fly for as low as $443. Users have also found prices from $451 and $453 on KLM 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 $1,115). 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

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Top 10 airlines flying from St. Louis to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Virgin Atlantic	Cheapest$654	Average$892	FlexibilityNo cancel fee	On-time72%
Iberia	Cheapest$657	Average$866	FlexibilityNo cancel fee	On-time77%
Scandinavian Airlines	Cheapest$669	Average$1,102	FlexibilityNo cancel fee	On-time77%
British Airways	Cheapest$687	Average$964	FlexibilityNo cancel fee	On-time70%
Air Canada	Cheapest$694	Average$955	FlexibilityNo cancel fee	On-time67%
United Airlines	Cheapest$702	Average$927	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$711	Average$1,043	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$713	Average$941	FlexibilityNo cancel fee	On-timeN/A
KLM	Cheapest$726	Average$896	FlexibilityNo cancel fee	On-time75%
Lufthansa	Cheapest$734	Average$1,132	FlexibilityNo cancel fee	On-time76%

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$443+ 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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Heathrow with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Lambert-St Louis to London Heathrow are usually found in October or September, booked 56 days in advance, depart on a Thursday or Tuesday and return on a Thursday

Cheap flight deals from St. Louis to Heathrow

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

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Find flight deals from St. Louis to Heathrow

Cheapest flights from St. Louis to HeathrowExplore 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 March 25, 2025.

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 March 25, 2025.

Cheapflights Fare Finder

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

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 March.

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.

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 March 21, 2025.

What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

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 March 25, 2025.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

Reviews of airlines servicing Heathrow

Get a feel of what it's like to fly with Delta, KLM and United Airlines from St. Louis to London by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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?

What are the cheapest airlines flying from St. Louis to London Heathrow Airport round-trip?

What are the cheapest airlines to fly from St. Louis to London Heathrow Airport one-way?

Can I find deals for flights from St. Louis to Heathrow that include hotel bookings?

How can I find direct flights from St. Louis to Heathrow?

Can I find deals for business class flights from St. Louis to Heathrow?

What is the cheapest month to book a flight from St. Louis to London Heathrow Airport?

Traveling to a place near St. Louis?

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Alternative routes for St. Louis to Heathrow

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Top 10 airlines flying from St. Louis to Heathrow

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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 March 25, 2025.