Question 1

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

Accepted Answer

Scandinavian Airlines, at £530, was found to be the cheapest airline from St. Louis to London Heathrow Airport.Alternate airlines flying return to your destination include British Airways and Air Canada. You may be able to fly from St. Louis to London Heathrow Airport for 25% less than the average price by searching for these airlines.

Question 2

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

Accepted Answer

The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as £345. However, be on the lookout for offers from KLM and United Airlines, as they are both options that can get you from St. Louis to London Heathrow Airport for a low price.

Question 3

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

Accepted Answer

The best time to book flights from St. Louis to London Heathrow Airport is 56 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.

Question 4

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

Accepted Answer

Currently, January is the cheapest month in which you can book a flight from St. Louis to London Heathrow Airport (average of £112). Flying from St. Louis to London Heathrow Airport in August is currently the most expensive (average of £164). 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.

Question 5

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

Accepted Answer

Travellers seeking maximum savings on their St. Louis to London Heathrow Airport flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Question 6

E

Accepted Answer

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Question 7

E

Accepted Answer

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Question 8

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

Accepted Answer

Consider American Airlines, Air Canada or British Airways when booking your flight. These represent the most popular airlines when flying from St. Louis to London Heathrow Airport.

Question 9

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

Accepted Answer

Monday is generally a great day to depart. Flying on this day could help you save up to 137%.

Question 10

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

Accepted Answer

Users have found that booking a flight from St. Louis to London Heathrow Airport at least 27 days early can save you up to 26% on average compared to booking a flight this week. If booking 27 days before your flight isn’t an option for you, users have found flights from St. Louis to London Heathrow Airport for as little as £633 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as £633 for flights departing within the next 3 days.

Question 11

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

Accepted Answer

Our data shows that April tends to be the cheapest month to fly to London Heathrow Airport from St. Louis. Users have commonly found prices around £686 for the month, but tickets can be as low as £500. Due to multiple factors, prepare for potentially higher prices in June.

Question 12

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

Accepted Answer

Unlike in the afternoon, when flights are generally more expensive, you can save up to 20% on flights from St. Louis to London Heathrow Airport by exploring options for tickets in the morning.

Question 13

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

Accepted Answer

Lambert-St Louis (STL) is the airport you will fly out of if you book a flight from St. Louis to London Heathrow. You should not have trouble finding flights to London Heathrow from Lambert-St Louis; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 5 airlines have flights from the St. Louis airport to London Heathrow. It is only a 12.7 mi journey to Lambert-St Louis (STL) from St. Louis’s city center.

Question 14

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

Accepted Answer

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

Question 15

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

Accepted Answer

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.

Question 16

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

Accepted Answer

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.

Question 17

How does Cheapflights help users find flights from St. Louis to Heathrow?

Accepted Answer

Cheapflights helps you search for flights from St. Louis to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Question 18

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Heathrow?

Accepted Answer

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from St. Louis to Heathrow.

Question 19

Can Cheapflights find flights from St. Louis to Heathrow with no change fees?

Accepted Answer

Yes! Cheapflights helps users easily find flights from St. Louis to Heathrow with no change fees.

Question 20

Can Cheapflights notify me if prices for flights from St. Louis to Heathrow become cheaper?

Accepted Answer

Not ready to book yet? You can track prices for flights from St. Louis to Heathrow on Cheapflights with our Price Alert feature and get notified when better prices are available.

Round-trip from	£530
One-way from	£228
Popular in	June
Cheapest in	October
Average price	£630

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest£500	Average£663	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
British Airways	Cheapest£502	Average£765	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£526	Average£826	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
KLM	Cheapest£533	Average£802	FlexibilityNo cancel fee	On-time75%	Search KLM flights
American Airlines	Cheapest£586	Average£1,001	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

Cheap flights from St. Louis to London Heathrow Airport from £228

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 25/7. Fares are subject to change and may not be available on all flights or dates of travel.

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 Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from St. Louis to Heathrow

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 29 April 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 29 April 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.

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 return flight from St. Louis to Heathrow. Price data was last updated on 25 April 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 29 April 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

Read reviews from past customers who have flown Delta, KLM and United Airlines from St. Louis to London. 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?

Travelling to a place near St. Louis?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Heathrow

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

Top 5 airlines flying from St. Louis to Heathrow

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from St. Louis to Heathrow?

Why should you use Cheapflights to find cheap flight tickets from St. Louis to Heathrow?

Can Cheapflights find flights from St. Louis to Heathrow with no change fees?

Can Cheapflights notify me if prices for flights from St. Louis to Heathrow become cheaper?

100% Free

Book with Flexibility

Travel Smart

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 29 April 2025.