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

According to our current data, Air Canada ($829), British Airways ($862), and United Airlines ($863) offers the cheapest pricing from St. Louis to London Heathrow Airport. Air Canada is 13% 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 $489. Users have also found prices from $528 and $558 on United Airlines and Air Canada, 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 26% 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 $668.

Most accurate provider : When it comes to deals on St. Louis-London Heathrow Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. AranGrant >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 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 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.

$304+ Flights from St. Louis to London Heathrow Airport - 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

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 January, 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	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$827 (CheapOair)
One-way from	$304 (Kiwi.com)
Popular in	June
Cheapest in	October
Average price	$842

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

Search Deals

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. 14% potential increase in price ($166 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 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 April 29, 2025.

Tue 10/141:30 pmSTL - LHR

2 stops20h 30mScandinavian Airlines

Wed 10/227:05 amLHR - STL

3 stops22h 34mScandinavian Airlines

Deal found 4/28

$708

Tue 9/91:30 pmSTL - LHR

1 stop14h 05mMultiple Airlines

Tue 9/2310:30 amLHR - STL

2 stops15h 27mMultiple Airlines

Deal found 4/28

$747

Wed 8/201:37 pmSTL - LHR

1 stop11h 13mBritish Airways

Wed 8/2712:30 pmLHR - STL

1 stop12h 38mBritish Airways

Deal found 4/28

$756

Wed 8/201:30 pmSTL - LHR

2 stops13h 05mAir Canada

Wed 8/279:30 amLHR - STL

2 stops35h 03mAir Canada

Deal found 4/28

$760

Sat 10/114:05 pmSTL - LHR

1 stop32h 30mUnited Airlines

Tue 10/212:05 pmLHR - STL

2 stops26h 29mUnited Airlines

Deal found 4/28

$767

Mon 8/259:00 amSTL - LHR

1 stop16h 15mDelta

Thu 9/46:30 amLHR - STL

2 stops16h 17mDelta

Deal found 4/28

$774

Fri 9/125:30 pmSTL - LHR

2 stops19h 10mLufthansa

Wed 9/176:30 amLHR - STL

1 stop13h 00mLufthansa

Deal found 4/28

$840

Wed 7/91:16 pmSTL - LHR

1 stop12h 39mIberia

Wed 7/2312:30 pmLHR - STL

1 stop13h 54mIberia

Deal found 4/27

$1,020

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 April 29, 2025.

Sat 7/264:00 pmSTL - LHR

1 stop32h 35mMultiple Airlines

Sat 8/236:30 amLHR - STL

2 stops15h 14mMultiple Airlines

Deal found 4/28

$827

Sat 7/264:00 pmSTL - LHR

1 stop32h 35mAir Canada

Sat 8/239:30 amLHR - STL

1 stop16h 30mAir Canada

Deal found 4/28

$829

Mon 5/197:30 pmSTL - LHR

1 stop10h 45mBritish Airways

Fri 5/3012:00 pmLHR - STL

1 stop13h 29mBritish Airways

Deal found 4/27

$862

Mon 5/196:00 amSTL - LHR

2 stops23h 50mUnited Airlines

Fri 5/307:30 amLHR - STL

2 stops16h 30mUnited Airlines

Deal found 4/27

$863

Sat 7/2610:30 amSTL - LHR

2 stops16h 20mDelta

Sat 8/236:30 amLHR - STL

2 stops15h 28mDelta

Deal found 4/28

$878

Wed 7/91:16 pmSTL - LHR

1 stop12h 39mIberia

Wed 7/2312:30 pmLHR - STL

1 stop13h 54mIberia

Deal found 4/27

$1,020

Wed 7/23:42 pmSTL - LHR

2 stops20h 48mScandinavian Airlines

Mon 7/146:40 amLHR - STL

2 stops22h 59mScandinavian Airlines

Deal found 4/28

$1,155

Wed 7/97:23 amSTL - LHR

2 stops19h 42mAer Lingus

Wed 7/237:40 amLHR - STL

2 stops18h 43mAer Lingus

Deal found 4/27

$1,180

Mon 6/25:27 pmSTL - LHR

2 stops20h 13mLufthansa

Mon 7/217:10 pmLHR - STL

2 stops26h 37mLufthansa

Deal found 4/28

$1,295

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

Fri 5/212:51 pmSTL - LHR

2 stops21h 09mScandinavian Airlines

Sun 5/46:40 amLHR - STL

3 stops19h 59mScandinavian Airlines

Deal found 4/28

$1,452

Mon 5/51:30 pmSTL - LHR

1 stop14h 30mAir Canada

Thu 5/159:30 amLHR - STL

1 stop16h 28mAir Canada

Deal found 4/28

$923

Mon 5/54:05 pmSTL - LHR

2 stops19h 35mScandinavian Airlines

Thu 5/159:05 pmLHR - STL

3 stops29h 34mScandinavian Airlines

Deal found 4/28

$1,829

Tue 5/61:30 pmSTL - LHR

1 stop11h 00mMultiple Airlines

Wed 5/1410:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 4/28

$897

Tue 5/131:10 pmSTL - LHR

1 stop11h 10mAustrian Airlines

Wed 5/213:20 pmLHR - STL

1 stop14h 17mAustrian Airlines

Deal found 4/28

$1,927

Sun 5/187:30 amSTL - LHR

1 stop22h 20mMultiple Airlines

Wed 5/2810:30 amLHR - STL

2 stops15h 28mMultiple Airlines

Deal found 4/27

$845

Mon 5/197:30 pmSTL - LHR

1 stop10h 45mBritish Airways

Fri 5/3012:00 pmLHR - STL

1 stop13h 29mBritish Airways

Deal found 4/27

$862

Mon 5/196:00 amSTL - LHR

2 stops23h 50mUnited Airlines

Fri 5/307:30 amLHR - STL

2 stops16h 30mUnited Airlines

Deal found 4/27

$863

Mon 5/191:09 pmSTL - LHR

2 stops14h 51mDelta

Mon 5/266:30 amLHR - STL

2 stops14h 30mDelta

Deal found 4/28

$930

Tue 5/207:30 amSTL - LHR

1 stop20h 05mAir Canada

Wed 5/288:40 amLHR - STL

2 stops17h 18mAir Canada

Deal found 4/27

$853

Mon 5/262:20 pmSTL - LHR

1 stop11h 30mIberia

Fri 6/612:15 pmLHR - STL

1 stop13h 02mIberia

Deal found 4/28

$1,041

Tue 5/271:10 pmSTL - LHR

1 stop11h 10mLufthansa

Tue 6/37:25 amLHR - STL

2 stops16h 35mLufthansa

Deal found 4/28

$3,181

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 April 29, 2025.

Fri 7/255:40 pmSTL - LHR

2 stops44h 40mMultiple Airlines

Deal found 4/27

$304

Wed 5/71:38 pmSTL - LHR

2 stops17h 47mAer Lingus

Deal found 4/28

$489

Fri 7/251:30 pmSTL - LHR

1 stop14h 30mUnited Airlines

Deal found 4/27

$528

Wed 5/71:30 pmSTL - LHR

1 stop14h 30mAir Canada

Deal found 4/28

$558

Tue 5/271:38 pmSTL - LHR

2 stops13h 22mBritish Airways

Deal found 4/28

$734

Sat 6/213:42 pmSTL - LHR

2 stops38h 23mWestJet

Deal found 4/28

$750

Sun 6/81:24 pmSTL - LHR

1 stop14h 56mIberia

Deal found 4/28

$812

Sun 6/810:48 amSTL - LHR

2 stops16h 02mDelta

Deal found 4/28

$828

Wed 5/711:49 amSTL - LHR

1 stop17h 36mLufthansa

Deal found 4/28

$4,044

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

Sat 7/26

4:00 pm-6:35 am

1 stop32h 35m

London Heathrow

Sat 8/23

6:30 am-3:44 pm

2 stops15h 14m

$827

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 7/26

4:00 pm-6:35 am

1 stop32h 35m

London Heathrow

Sat 8/23

9:30 am-8:00 pm

1 stop16h 30m

$829

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 5/19

7:30 pm-12:15 pm

1 stop10h 45m

London Heathrow

Fri 5/30

12:00 pm-7:29 pm

1 stop13h 29m

$862

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 5/19

6:00 am-11:50 am

2 stops23h 50m

London Heathrow

Fri 5/30

7:30 am-6:00 pm

2 stops16h 30m

$863

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Sat 7/26

10:30 am-8:50 am

2 stops16h 20m

London Heathrow

Sat 8/23

6:30 am-3:58 pm

2 stops15h 28m

$878

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/9

1:16 pm-7:55 am

1 stop12h 39m

London Heathrow

Wed 7/23

12:30 pm-8:24 pm

1 stop13h 54m

$1,020

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/2

3:42 pm-6:30 pm

2 stops20h 48m

London Heathrow

Mon 7/14

6:40 am-11:39 pm

2 stops22h 59m

$1,155

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 7/9

7:23 am-9:05 am

2 stops19h 42m

London Heathrow

Wed 7/23

7:40 am-8:23 pm

2 stops18h 43m

$1,180

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Mon 6/2

5:27 pm-7:40 pm

2 stops20h 13m

London Heathrow

Mon 7/21

7:10 pm-3:47 pm

2 stops26h 37m

$1,295

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 7/25

5:40 pm-8:20 pm

2 stops44h 40m

$304

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/27

Showing 1-10 of 18 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 April.

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

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on St. Louis-London Heathrow Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on St. Louis-London Heathrow Airport flight deals on Cheapflights vs. AranGrant >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 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 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 $1,110). 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, United Airlines and Scandinavian 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

7,929 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

7,929 reviews

Delta

8.0

Very good

7,929 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

8,696 reviews

Delta

8.0

Very good

7,929 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

1,345 reviews

Delta

8.0

Very good

7,929 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.

WestJet

7.2

Good

2,823 reviews

Delta

8.0

Very good

7,929 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.

Air Canada

7.0

Good

9,240 reviews

Delta

8.0

Very good

7,929 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, Air Canada ($829), British Airways ($862), and United Airlines ($863) offers the cheapest pricing from St. Louis to London Heathrow Airport. Air Canada is 13% 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 $489. Users have also found prices from $528 and $558 on United Airlines and Air Canada, 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 $1,110). 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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Horley

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Harrow

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Gatwick

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Croydon

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Folkestone

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Broadway

Aylesbury

Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from St. Louis to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Scandinavian Airlines	Cheapest$669	Average$1,102	FlexibilityNo cancel fee	On-time77%
Iberia	Cheapest$672	Average$968	FlexibilityNo cancel fee	On-time77%
United Airlines	Cheapest$702	Average$956	FlexibilityNo cancel fee	On-time69%
Virgin Atlantic	Cheapest$703	Average$913	FlexibilityNo cancel fee	On-time72%
British Airways	Cheapest$705	Average$985	FlexibilityNo cancel fee	On-time70%
KLM	Cheapest$726	Average$896	FlexibilityNo cancel fee	On-time75%
Delta	Cheapest$726	Average$945	FlexibilityNo cancel fee	On-timeN/A
Air Canada	Cheapest$728	Average$983	FlexibilityNo cancel fee	On-time67%
Lufthansa	Cheapest$734	Average$1,076	FlexibilityNo cancel fee	On-time76%
American Airlines	Cheapest$742	Average$1,038	FlexibilityNo cancel fee	On-time71%

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$304+ 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 7/25. 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 January, 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

Average price

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 April 29, 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 April 29, 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 April.

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.

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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 April 25, 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 April 29, 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, United Airlines and Scandinavian 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?

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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 April 29, 2025.