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

Cheapflights users have booked flights from London Heathrow Airport to St. Louis round-trip from $775. Other airlines that can offer you cheap pricing are Iberia, from $852, and Finnair, from $879. You may be able to fly from London Heathrow Airport to St. Louis for 16% less than the average price by searching for these airlines.

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

One-way options have recently been found by users for as low as $791 on Lufthansa. Other airlines that offer cheap prices include WestJet from $825 and Aer Lingus from $847 one-way.

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

Travelers seeking maximum savings on their London Heathrow Airport to St. Louis flight should consider departing on Thursday at noon when fares are most often at their lowest. Saturday 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 London Heathrow Airport to St. Louis?

Before booking your flight from London Heathrow Airport to St. Louis check out the most popular airlines for this route: American Airlines, British Airways or Lufthansa.

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

It’s generally more expensive to depart on a Wednesday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

Travelers have found it’s best to book a flight 14 days in advance to save up to 31% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 14 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from London Heathrow Airport to St. Louis 1-2 weeks in advance for as low as $686, or $1,467 for flights within the next 24 hours.

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

Our data shows that March tends to be the cheapest month to fly to St. Louis from London Heathrow Airport. Users have commonly found prices around $936 for the month, but tickets can be as low as $656. Due to multiple factors, prepare for potentially higher prices in December.

Most accurate provider : When it comes to deals on London Heathrow Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on London Heathrow Airport-St. Louis 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 London Heathrow Airport-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly into for flights to St. Louis from London Heathrow?

Lambert-St Louis (STL) is the airport you will fly into if you book a flight from London Heathrow to St. Louis. You should not have trouble finding flights to Lambert-St Louis from London Heathrow; the airport handles an average of 0 inbound flights from London Heathrow per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the St. Louis airport from London Heathrow. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

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

Yes. In addition to deals on Heathrow to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

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

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to St. Louis.

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

Yes. Cheapflights offers flight deals from Heathrow to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$375+ Flights from London Heathrow Airport to St. Louis

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Find cheap flights from Heathrow to St. Louis with Cheapflights

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.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or September, booked 65 days in advance, depart on a Thursday or Wednesday and return on a Thursday

Cheap flight deals from Heathrow to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$775 (United Airlines)
One-way from	$375 (Kiwi.com)
Popular in	August
Cheapest in	February
Average price	$915

Provider with most accurate pricing for London Heathrow-Lambert-St Louis flight deals.

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Provider most trusted by Cheapflights users for London Heathrow-Lambert-St Louis flights.

Search Deals

From London Heathrow to Lambert-St Louis

Search Deals

One-way flight from London Heathrow to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($82 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

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Find flight deals from Heathrow to St. Louis

Cheapest flights from Heathrow to St. Louis
Explore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.

Mon 5/53:50 pmLHR - STL

2 stops29h 59mUnited Airlines

Mon 5/193:43 pmSTL - LHR

2 stops13h 42mUnited Airlines

Deal found 4/9

$775

Mon 4/2812:30 pmLHR - STL

1 stop14h 28mIberia

Mon 5/57:30 pmSTL - LHR

1 stop10h 45mIberia

Deal found 4/10

$852

Sat 5/310:20 amLHR - STL

2 stops19h 39mFinnair

Sat 5/104:15 pmSTL - LHR

1 stop12h 15mFinnair

Deal found 4/10

$879

Fri 5/95:30 pmLHR - STL

2 stops33h 10mMultiple Airlines

Sun 5/1110:10 amSTL - LHR

2 stops25h 05mMultiple Airlines

Deal found 4/10

$902

Fri 5/96:30 amLHR - STL

1 stop13h 00mLufthansa

Sun 5/111:00 pmSTL - LHR

1 stop11h 55mLufthansa

Deal found 4/10

$918

Fri 4/1812:30 pmLHR - STL

1 stop14h 57mBritish Airways

Sat 4/266:00 pmSTL - LHR

1 stop10h 30mBritish Airways

Deal found 4/10

$980

Wed 5/711:45 amLHR - STL

2 stops17h 41mDelta

Mon 5/121:09 pmSTL - LHR

2 stops14h 51mDelta

Deal found 4/10

$989

Mon 4/2811:05 amLHR - STL

1 stop12h 18mAustrian Airlines

Mon 5/51:10 pmSTL - LHR

1 stop11h 10mAustrian Airlines

Deal found 4/11

$992

Mon 4/281:05 pmLHR - STL

1 stop16h 31mAir France

Mon 5/55:32 pmSTL - LHR

1 stop13h 58mAir France

Deal found 4/10

$1,006

Wed 5/79:20 amLHR - STL

1 stop17h 19mVirgin Atlantic

Wed 5/1410:45 amSTL - LHR

2 stops13h 35mVirgin Atlantic

Deal found 4/10

$1,014

Wed 5/711:00 amLHR - STL

1 stop14h 23mAmerican Airlines

Wed 5/146:47 pmSTL - LHR

1 stop11h 43mAmerican Airlines

Deal found 4/10

$1,023

Thu 9/46:50 amLHR - STL

2 stops14h 26mAir Canada

Tue 9/91:30 pmSTL - LHR

1 stop11h 00mAir Canada

Deal found 4/11

$1,032

Best flights from Heathrow to St. Louis
Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 11, 2025.

Mon 5/53:50 pmLHR - STL

2 stops29h 59mUnited Airlines

Mon 5/191:41 pmSTL - LHR

1 stop16h 39mUnited Airlines

Deal found 4/9

$775

Mon 4/2812:30 pmLHR - STL

1 stop14h 28mIberia

Mon 5/57:30 pmSTL - LHR

1 stop10h 45mIberia

Deal found 4/10

$852

Sat 5/310:20 amLHR - STL

2 stops19h 39mFinnair

Sat 5/104:15 pmSTL - LHR

1 stop12h 15mFinnair

Deal found 4/10

$879

Fri 5/95:30 pmLHR - STL

2 stops33h 10mMultiple Airlines

Sun 5/1110:10 amSTL - LHR

2 stops25h 05mMultiple Airlines

Deal found 4/10

$902

Fri 5/96:30 amLHR - STL

1 stop13h 00mLufthansa

Sun 5/111:00 pmSTL - LHR

1 stop11h 55mLufthansa

Deal found 4/10

$918

Mon 4/288:20 amLHR - STL

1 stop14h 16mBritish Airways

Mon 5/51:38 pmSTL - LHR

1 stop11h 42mBritish Airways

Deal found 4/10

$984

Wed 5/711:45 amLHR - STL

2 stops17h 41mDelta

Mon 5/121:09 pmSTL - LHR

2 stops14h 51mDelta

Deal found 4/10

$989

Mon 4/281:05 pmLHR - STL

1 stop16h 31mAir France

Mon 5/55:32 pmSTL - LHR

1 stop13h 58mAir France

Deal found 4/10

$1,006

Wed 5/79:20 amLHR - STL

1 stop17h 19mVirgin Atlantic

Wed 5/1410:45 amSTL - LHR

2 stops13h 35mVirgin Atlantic

Deal found 4/10

$1,014

Wed 5/711:00 amLHR - STL

1 stop14h 23mAmerican Airlines

Wed 5/146:47 pmSTL - LHR

1 stop11h 43mAmerican Airlines

Deal found 4/10

$1,023

Tue 6/105:00 pmLHR - STL

2 stops36h 51mScandinavian Airlines

Sun 6/151:30 pmSTL - LHR

2 stops22h 10mScandinavian Airlines

Deal found 4/10

$1,041

Thu 7/39:30 amLHR - STL

1 stop16h 30mAir Canada

Sun 7/139:15 amSTL - LHR

2 stops15h 15mAir Canada

Deal found 4/10

$1,136

Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated April 11, 2025 and is based on user searches.

Fri 4/188:00 amLHR - STL

2 stops20h 09mUnited Airlines

Sat 4/264:45 pmSTL - LHR

1 stop34h 55mUnited Airlines

Deal found 4/10

$856

Fri 4/1812:30 pmLHR - STL

1 stop14h 57mBritish Airways

Sat 4/266:00 pmSTL - LHR

1 stop10h 30mBritish Airways

Deal found 4/10

$980

Fri 4/188:30 amLHR - STL

2 stops14h 53mLufthansa

Sat 4/269:39 amSTL - LHR

2 stops14h 16mLufthansa

Deal found 4/10

$1,070

Fri 4/187:05 amLHR - STL

3 stops19h 34mScandinavian Airlines

Sat 4/264:15 pmSTL - LHR

2 stops19h 25mScandinavian Airlines

Deal found 4/10

$1,388

Mon 4/2112:15 pmLHR - STL

1 stop15h 57mIberia

Fri 4/252:03 pmSTL - LHR

1 stop12h 02mIberia

Deal found 4/10

$908

Mon 4/211:25 pmLHR - STL

2 stops16h 08mAer Lingus

Fri 4/2510:17 amSTL - LHR

2 stops16h 48mAer Lingus

Deal found 4/10

$1,626

Mon 4/2812:30 pmLHR - STL

1 stop14h 28mIberia

Mon 5/57:30 pmSTL - LHR

1 stop10h 45mIberia

Deal found 4/10

$852

Mon 4/2811:05 amLHR - STL

1 stop12h 18mAustrian Airlines

Mon 5/51:10 pmSTL - LHR

1 stop11h 10mAustrian Airlines

Deal found 4/11

$992

Mon 4/281:05 pmLHR - STL

1 stop16h 31mAir France

Mon 5/55:32 pmSTL - LHR

1 stop13h 58mAir France

Deal found 4/10

$1,006

Mon 4/287:05 amLHR - STL

3 stops22h 31mScandinavian Airlines

Mon 5/54:05 pmSTL - LHR

2 stops19h 35mScandinavian Airlines

Deal found 4/10

$1,123

Sat 5/310:20 amLHR - STL

2 stops19h 39mFinnair

Sat 5/104:15 pmSTL - LHR

1 stop12h 15mFinnair

Deal found 4/10

$879

Mon 5/53:50 pmLHR - STL

2 stops29h 59mUnited Airlines

Mon 5/191:41 pmSTL - LHR

1 stop16h 39mUnited Airlines

Deal found 4/9

$775

One-way flights from Heathrow to St. Louis
Search for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated April 11, 2025.

Thu 5/88:50 pmLHR - STL

3 stops57h 16mMultiple Airlines

Deal found 4/10

$375

Wed 4/306:30 amLHR - STL

1 stop13h 00mLufthansa

Deal found 4/10

$791

Thu 7/102:10 pmLHR - STL

2 stops38h 51mWestJet

Deal found 4/9

$825

Fri 7/47:40 amLHR - STL

2 stops16h 43mAer Lingus

Deal found 4/9

$847

Tue 9/912:30 pmLHR - STL

1 stop13h 51mIberia

Deal found 4/10

$886

Sat 5/102:25 pmLHR - STL

1 stop13h 27mFinnair

Deal found 4/10

$896

Tue 9/911:20 amLHR - STL

1 stop12h 42mAir France

Deal found 4/10

$1,500

Fri 6/202:25 pmLHR - STL

1 stop12h 05mBritish Airways

Deal found 4/10

$1,723

Tue 9/99:05 pmLHR - STL

3 stops29h 44mScandinavian Airlines

Deal found 4/10

$2,434

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 5/5

3:50 pm-3:49 pm

2 stops29h 59m

Lambert-St Louis

Mon 5/19

3:43 pm-11:25 am

2 stops13h 42m

$775

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/28

12:30 pm-8:58 pm

1 stop14h 28m

Lambert-St Louis

Mon 5/5

7:30 pm-12:15 pm

1 stop10h 45m

$852

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 5/3

10:20 am-11:59 pm

2 stops19h 39m

Lambert-St Louis

Sat 5/10

4:15 pm-10:30 am

1 stop12h 15m

$879

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 5/9

5:30 pm-8:40 pm

2 stops33h 10m

Lambert-St Louis

Sun 5/11

10:10 am-5:15 pm

2 stops25h 05m

$902

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 5/9

6:30 am-1:30 pm

1 stop13h 00m

Lambert-St Louis

Sun 5/11

1:00 pm-6:55 am

1 stop11h 55m

$918

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/28

8:20 am-4:36 pm

1 stop14h 16m

Lambert-St Louis

Mon 5/5

1:38 pm-7:20 am

1 stop11h 42m

$984

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 5/7

11:45 am-11:26 pm

2 stops17h 41m

Lambert-St Louis

Mon 5/12

1:09 pm-10:00 am

2 stops14h 51m

$989

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/28

11:05 am-5:23 pm

1 stop12h 18m

Lambert-St Louis

Mon 5/5

1:10 pm-6:20 am

1 stop11h 10m

$992

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 4/28

1:05 pm-11:36 pm

1 stop16h 31m

Lambert-St Louis

Mon 5/5

5:32 pm-1:30 pm

1 stop13h 58m

$1,006

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 5/7

9:20 am-8:39 pm

1 stop17h 19m

Lambert-St Louis

Wed 5/14

10:45 am-6:20 am

2 stops13h 35m

$1,014

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/10

Showing 1-10 of 24 results

Compare providers for flights from Heathrow to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to St. Louis in April.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*1 star
Mytrip	Price Accuracy3 stars	Trust Score*3 stars
Thrive Travel	Price Accuracy3 stars	Trust Score*2 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 London Heathrow Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London Heathrow Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on London Heathrow Airport-St. Louis 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 London Heathrow Airport-St. Louis 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 Heathrow to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Heathrow 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 London Heathrow Airport to St. Louis

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

The best time to book flights from London Heathrow Airport to St. Louis is 65 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of $311). Flying from London Heathrow Airport to St. Louis in March is currently the most expensive (average of $356). 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 LHR to STL?

It’s optimal to fly from London Heathrow Airport to St. Louis at noon. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight in the morning.

Rainfall in St. Louis by month

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Delta, Finnair and Austrian Airlines from London to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,910 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very good

7,910 reviews

Delta

8.0

Very good

7,910 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,269 reviews

Delta

8.0

Very good

7,910 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Austrian Airlines

7.6

Good

774 reviews

Delta

8.0

Very good

7,910 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Air France

7.4

Good

1,428 reviews

Delta

8.0

Very good

7,910 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

United Airlines

7.4

Good

8,636 reviews

Delta

8.0

Very good

7,910 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What airport do you fly into for flights to St. Louis from London Heathrow?
Lambert-St Louis (STL) is the airport you will fly into if you book a flight from London Heathrow to St. Louis. You should not have trouble finding flights to Lambert-St Louis from London Heathrow; the airport handles an average of 0 inbound flights from London Heathrow per day. You should also have plenty of airline options to choose from since 4 airlines have flights to the St. Louis airport from London Heathrow. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.
What are the cheapest airlines flying from London Heathrow Airport to St. Louis round-trip?
Cheapflights users have booked flights from London Heathrow Airport to St. Louis round-trip from $775. Other airlines that can offer you cheap pricing are Iberia, from $852, and Finnair, from $879. You may be able to fly from London Heathrow Airport to St. Louis for 16% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from London Heathrow Airport to St. Louis one-way?
One-way options have recently been found by users for as low as $791 on Lufthansa. Other airlines that offer cheap prices include WestJet from $825 and Aer Lingus from $847 one-way.
Can I find deals for flights from Heathrow to St. Louis that include hotel bookings?
Yes. In addition to deals on Heathrow to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Heathrow to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to St. Louis.
Can I find deals for business class flights from Heathrow to St. Louis?
Yes. Cheapflights offers flight deals from Heathrow to St. Louis 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 London Heathrow Airport to St. Louis?
Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of $311). Flying from London Heathrow Airport to St. Louis in March is currently the most expensive (average of $356). 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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Other flights to St. Louis

Top 4 airlines flying from Heathrow to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$278	Average$1,357	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$867	Average$1,263	FlexibilityNo cancel fee	On-time69%
Lufthansa	Cheapest$925	Average$928	FlexibilityNo cancel fee	On-time76%
British Airways	Cheapest$997	Average$1,164	FlexibilityNo cancel fee	On-time70%

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$375+ Cheap flights from Heathrow (LHR) to St. Louis (STL)

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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Heathrow to St. Louis 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 London Heathrow to Lambert-St Louis are usually found in February or September, booked 65 days in advance, depart on a Thursday or Wednesday and return on a Thursday

Cheap flight deals from Heathrow to St. Louis

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Heathrow to St. Louis

Cheapest flights from Heathrow to St. LouisExplore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.

Explore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.

Cheapflights Fare Finder

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

Compare providers for flights from Heathrow to St. Louis

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 Heathrow to St. Louis in April.

Best time to book a flight from Heathrow to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Heathrow with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to St. Louis

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

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to St. Louis. Price data was last updated on April 4, 2025.

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

What is the cheapest time of day to fly from LHR to STL?

Find hourly flight availability from Heathrow to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 11, 2025.

Rainfall in St. Louis by month

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

Temperature in St. Louis by month

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

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Delta, Finnair and Austrian Airlines from London to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to St. Louis. 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 into for flights to St. Louis from London Heathrow?

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

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

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

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

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

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

Traveling to a place near London Heathrow Airport?

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Alternative routes for Heathrow to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Heathrow to St. Louis

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Cheapest flights from Heathrow to St. Louis
Explore the most affordable flight options available from Heathrow to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 11, 2025.