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 $900. Other airlines that can offer you cheap pricing are British Airways, from $904, and Iberia, from $919. You may be able to fly from London Heathrow Airport to St. Louis for 3% 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 $898 on Aer Lingus. Other airlines that offer cheap prices include Finnair from $905 and British Airways from $967 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 47% 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 $938 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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on London Heathrow Airport-St. Louis flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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.

$502+ Flights from London Heathrow Airport to St. Louis - Compare & Save Big

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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

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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 26 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	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$862 (Mytrip)
One-way from	$502 (Kiwi.com)
Popular in	August
Cheapest in	February
Average price	$918

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 ($25 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 29, 2025.

Thu 6/121:45 pmLHR - STL

3 stops33h 19mMultiple Airlines

Thu 6/196:12 pmSTL - LHR

3 stops30h 23mMultiple Airlines

Deal found 4/28

$862

Tue 5/67:30 pmLHR - STL

2 stops31h 28mBritish Airways

Mon 5/194:15 pmSTL - LHR

1 stop12h 15mBritish Airways

Deal found 4/28

$897

Thu 6/126:40 amLHR - STL

2 stops20h 54mScandinavian Airlines

Thu 6/191:30 pmSTL - LHR

2 stops23h 00mScandinavian Airlines

Deal found 4/28

$900

Thu 6/1212:30 pmLHR - STL

1 stop13h 49mIberia

Thu 6/191:21 pmSTL - LHR

1 stop11h 59mIberia

Deal found 4/27

$919

Sat 10/48:30 amLHR - STL

2 stops32h 04mLufthansa

Wed 10/2212:28 pmSTL - LHR

2 stops12h 27mLufthansa

Deal found 4/28

$920

Mon 5/55:40 pmLHR - STL

2 stops32h 18mAir Canada

Sun 5/181:30 pmSTL - LHR

1 stop11h 00mAir Canada

Deal found 4/28

$993

Mon 5/59:30 amLHR - STL

1 stop16h 28mUnited Airlines

Sun 5/181:30 pmSTL - LHR

1 stop11h 00mUnited Airlines

Deal found 4/28

$1,002

Tue 5/611:30 amLHR - STL

2 stops16h 06mVirgin Atlantic

Tue 5/1310:45 amSTL - LHR

2 stops14h 00mVirgin Atlantic

Deal found 4/29

$1,033

Tue 5/611:45 amLHR - STL

2 stops17h 51mDelta

Tue 5/2711:32 amSTL - LHR

1 stop19h 38mDelta

Deal found 4/29

$1,108

Wed 4/301:25 pmLHR - STL

2 stops16h 08mAer Lingus

Wed 5/71:38 pmSTL - LHR

2 stops17h 47mAer Lingus

Deal found 4/29

$1,158

Tue 7/812:15 pmLHR - STL

1 stop14h 04mAmerican Airlines

Sat 9/138:01 pmSTL - LHR

1 stop10h 14mAmerican Airlines

Deal found 4/28

$1,219

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 29, 2025.

Thu 6/121:45 pmLHR - STL

3 stops33h 19mMultiple Airlines

Thu 6/196:12 pmSTL - LHR

3 stops30h 23mMultiple Airlines

Deal found 4/28

$862

Thu 6/126:40 amLHR - STL

2 stops20h 54mScandinavian Airlines

Thu 6/191:30 pmSTL - LHR

2 stops23h 00mScandinavian Airlines

Deal found 4/28

$900

Wed 9/36:30 amLHR - STL

2 stops19h 51mBritish Airways

Wed 9/108:01 pmSTL - LHR

1 stop10h 14mBritish Airways

Deal found 4/29

$904

Thu 6/1212:30 pmLHR - STL

1 stop13h 49mIberia

Thu 6/191:21 pmSTL - LHR

1 stop11h 59mIberia

Deal found 4/27

$919

Sat 10/48:30 amLHR - STL

2 stops33h 55mLufthansa

Wed 10/2212:28 pmSTL - LHR

1 stop11h 52mLufthansa

Deal found 4/28

$920

Fri 9/129:30 amLHR - STL

1 stop16h 27mAir Canada

Sat 9/201:30 pmSTL - LHR

1 stop14h 05mAir Canada

Deal found 4/29

$1,000

Fri 5/92:05 pmLHR - STL

1 stop11h 53mUnited Airlines

Tue 5/134:45 pmSTL - LHR

1 stop13h 35mUnited Airlines

Deal found 4/29

$1,007

Mon 5/196:30 amLHR - STL

2 stops16h 05mDelta

Mon 6/21:09 pmSTL - LHR

2 stops15h 10mDelta

Deal found 4/28

$1,184

Wed 10/1512:00 pmLHR - STL

2 stops17h 25mAer Lingus

Sun 10/196:35 amSTL - LHR

2 stops21h 45mAer Lingus

Deal found 4/28

$1,193

Tue 7/812:15 pmLHR - STL

1 stop14h 04mAmerican Airlines

Sat 9/138:01 pmSTL - LHR

1 stop10h 14mAmerican Airlines

Deal found 4/28

$1,219

Fri 10/1011:05 amLHR - STL

1 stop13h 08mAustrian Airlines

Sun 10/1911:35 amSTL - LHR

1 stop27h 05mAustrian Airlines

Deal found 4/28

$1,300

Wed 6/411:30 amLHR - STL

2 stops18h 08mAir France

Sat 6/75:00 pmSTL - LHR

1 stop31h 45mAir France

Deal found 4/28

$1,339

Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated April 29, 2025 and is based on user searches.

Wed 4/301:25 pmLHR - STL

2 stops16h 08mAer Lingus

Wed 5/71:38 pmSTL - LHR

2 stops17h 47mAer Lingus

Deal found 4/29

$1,158

Wed 4/306:30 amLHR - STL

2 stops16h 17mKLM

Wed 5/71:09 pmSTL - LHR

1 stop11h 36mKLM

Deal found 4/29

$1,410

Thu 5/111:30 amLHR - STL

2 stops18h 06mAir France

Thu 5/81:09 pmSTL - LHR

1 stop16h 01mAir France

Deal found 4/28

$1,438

Sun 5/41:05 pmLHR - STL

1 stop13h 34mKLM

Mon 5/261:09 pmSTL - LHR

1 stop11h 36mKLM

Deal found 4/29

$1,697

Mon 5/510:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Mon 5/121:30 pmSTL - LHR

1 stop14h 30mMultiple Airlines

Deal found 4/28

$970

Mon 5/55:40 pmLHR - STL

2 stops32h 18mAir Canada

Sun 5/181:30 pmSTL - LHR

1 stop11h 00mAir Canada

Deal found 4/28

$993

Mon 5/59:30 amLHR - STL

1 stop16h 28mUnited Airlines

Sun 5/181:30 pmSTL - LHR

1 stop11h 00mUnited Airlines

Deal found 4/28

$1,002

Mon 5/51:25 pmLHR - STL

2 stops16h 26mAer Lingus

Mon 5/266:00 amSTL - LHR

2 stops21h 05mAer Lingus

Deal found 4/29

$1,321

Mon 5/52:25 pmLHR - STL

1 stop13h 27mIberia

Mon 5/261:45 pmSTL - LHR

1 stop13h 15mIberia

Deal found 4/29

$1,416

Mon 5/51:05 pmLHR - STL

1 stop13h 34mAir France

Tue 5/273:40 pmSTL - LHR

1 stop13h 30mAir France

Deal found 4/29

$1,657

Tue 5/67:30 pmLHR - STL

2 stops31h 28mBritish Airways

Mon 5/194:15 pmSTL - LHR

1 stop12h 15mBritish Airways

Deal found 4/28

$897

Tue 5/65:40 pmLHR - STL

2 stops28h 07mLufthansa

Mon 5/199:40 amSTL - LHR

2 stops15h 15mLufthansa

Deal found 4/28

$971

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 29, 2025.

Tue 5/132:10 pmLHR - STL

3 stops39h 56mMultiple Airlines

Deal found 4/28

$502

Sat 7/58:50 amLHR - STL

2 stops29h 06mAer Lingus

Deal found 4/29

$898

Thu 5/292:10 pmLHR - STL

1 stop13h 42mFinnair

Deal found 4/29

$905

Mon 6/2312:30 pmLHR - STL

1 stop13h 49mBritish Airways

Deal found 4/29

$967

Fri 10/32:25 pmLHR - STL

1 stop11h 58mIberia

Deal found 4/28

$1,060

Thu 7/108:30 amLHR - STL

1 stop13h 17mLufthansa

Deal found 4/28

$1,172

Thu 10/211:20 amLHR - STL

2 stops32h 59mTurkish Airlines

Deal found 4/28

$1,232

Tue 9/308:15 amLHR - STL

2 stops21h 08mAmerican Airlines

Deal found 4/28

$1,297

Tue 9/309:20 amLHR - STL

1 stop14h 42mAir France

Deal found 4/28

$1,327

Fri 8/82:10 pmLHR - STL

2 stops32h 58mWestJet

Deal found 4/27

$1,610

Fri 6/206:00 amLHR - STL

2 stops18h 00mAustrian Airlines

Deal found 4/28

$1,793

Fri 6/206:40 amLHR - STL

2 stops20h 54mScandinavian Airlines

Deal found 4/29

$1,795

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

Thu 6/12

1:45 pm-5:04 pm

3 stops33h 19m

Lambert-St Louis

Thu 6/19

6:12 pm-6:35 am

3 stops30h 23m

$862

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 6/12

6:40 am-9:34 pm

2 stops20h 54m

Lambert-St Louis

Thu 6/19

1:30 pm-6:30 pm

2 stops23h 00m

$900

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 9/3

6:30 am-8:21 pm

2 stops19h 51m

Lambert-St Louis

Wed 9/10

8:01 pm-12:15 pm

1 stop10h 14m

$904

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 6/12

12:30 pm-8:19 pm

1 stop13h 49m

Lambert-St Louis

Thu 6/19

1:21 pm-7:20 am

1 stop11h 59m

$919

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 10/4

8:30 am-10:34 am

2 stops32h 04m

Lambert-St Louis

Wed 10/22

12:28 pm-6:55 am

2 stops12h 27m

$920

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 9/12

9:30 am-7:57 pm

1 stop16h 27m

Lambert-St Louis

Sat 9/20

1:30 pm-9:35 am

1 stop14h 05m

$1,000

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 5/9

2:05 pm-7:58 pm

1 stop11h 53m

Lambert-St Louis

Tue 5/13

4:45 pm-12:20 pm

1 stop13h 35m

$1,007

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 5/19

6:30 am-4:35 pm

2 stops16h 05m

Lambert-St Louis

Mon 6/2

1:09 pm-10:19 am

2 stops15h 10m

$1,184

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 10/15

12:00 pm-11:25 pm

2 stops17h 25m

Lambert-St Louis

Sun 10/19

6:35 am-10:20 am

2 stops21h 45m

$1,193

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 7/8

12:15 pm-8:19 pm

1 stop14h 04m

Lambert-St Louis

Sat 9/13

8:01 pm-12:15 pm

1 stop10h 14m

$1,219

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 25 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*2 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars
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 AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on London Heathrow Airport-St. Louis flight deals on Cheapflights vs. AranGrant >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 AranGrant the most. AranGrant 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 26 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, KLM and Finnair 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

7,936 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

7,936 reviews

Delta

8.0

Very good

7,936 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

KLM

7.8

Good

1,333 reviews

Delta

8.0

Very good

7,936 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

1,275 reviews

Delta

8.0

Very good

7,936 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

780 reviews

Delta

8.0

Very good

7,936 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

1,446 reviews

Delta

8.0

Very good

7,936 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 $900. Other airlines that can offer you cheap pricing are British Airways, from $904, and Iberia, from $919. You may be able to fly from London Heathrow Airport to St. Louis for 3% 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 $898 on Aer Lingus. Other airlines that offer cheap prices include Finnair from $905 and British Airways from $967 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$961	Average$1,151	FlexibilityNo cancel fee	On-time70%

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$502+ 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 5/13. 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 26 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

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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 29, 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 29, 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 25, 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 29, 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, KLM and Finnair 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

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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 29, 2025.