Question 1

What’s the cheapest stopover airport for flights from London Heathrow Airport to St. Louis?

Accepted Answer

Detroit (DTW) is the most affordable one-stop option, with an average return flight price of £638.

Question 2

What’s the fastest stopover option from London Heathrow Airport to St. Louis?

Accepted Answer

Flights via Montreal (YUL) have the shortest average one-way travel time for one-stop routes: 11h 48m.

Question 3

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to St. Louis?

Accepted Answer

Flights via Frankfurt am Main (FRA) offer the fastest connection on this route, with an average stopover time of 1h 08m.

Question 4

What’s the top stopover airport for flights from London Heathrow Airport to St. Louis?

Accepted Answer

Chicago (ORD) – chosen by Cheapflights users on 60% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.

Question 5

How long is the flight from London Heathrow Airport to St. Louis?

Accepted Answer

Departing from London Heathrow Airport to St. Louis will take you 16h 27m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi. This flight may include one or multiple stops.

Question 6

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

Accepted Answer

Cheapflights users have booked flights from London Heathrow Airport to St. Louis round-trip from £87. Other airlines that can offer you cheap pricing are Scandinavian Airlines, from £477, and Finnair, from £506. American Airlines is priced at 87% lower than the current average price of a flight leaving 3 months from now.

Question 7

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

Accepted Answer

To ensure you get the cheapest price possible for a flight from London Heathrow Airport to St. Louis, you should look to book at least 26 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.

Question 8

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

Accepted Answer

Currently, February is the cheapest month in which you can book a flight from London Heathrow Airport to St. Louis (average of £722). Flying from London Heathrow Airport to St. Louis in December is currently the most expensive (average of £1,033). 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 9

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

Accepted Answer

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

Question 10

E

Accepted Answer

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 inches per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

Question 11

E

Accepted Answer

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 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

Flying to your destination on a Wednesday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to St. Louis. Check prices with Cheapflights to find a great deal for your trip.

Question 14

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

Accepted Answer

Travelers have found it’s best to book a flight 14 days in advance to save up to 56% 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 £508, or £794 for flights within the next 24 hours.

Question 15

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

Accepted Answer

The best pricing can be found in the month of March. Prices to St. Louis from London Heathrow Airport average £720. You can even find prices in March for less than £720, as users have found deals to St. Louis from as low as £486. The month of December appears to be one of the more expensive times to travel to St. Louis from London Heathrow Airport. Flying in the targeted month can save you up to 40%.

Question 16

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

Accepted Answer

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the morning.

Question 17

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

Accepted Answer

For a flight from London Heathrow to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 0 inbound flights from London Heathrow per day. 10 airlines have flights to Lambert-St Louis from London Heathrow on a regular basis.

Question 18

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

Accepted Answer

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

Question 19

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

Accepted Answer

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.

Question 20

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

Accepted Answer

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.

Question 21

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

Accepted Answer

Cheapflights makes it easy to find Heathrow to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Question 22

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

Accepted Answer

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Louis from Heathrow.

Question 23

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

Accepted Answer

Certainly. Search results for flights to St. Louis from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Question 24

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

Accepted Answer

Yes, Cheapflights offers price alerts on Heathrow to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

Round-trip from	£604
One-way from	£377
Popular in	August
Cheapest in	February
Average price	£900

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest£87	Average£762	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Scandinavian Airlines	Cheapest£477	Average£616	FlexibilityNo cancel fee	On-time77%	Search Scandinavian Airlines flights
Finnair	Cheapest£506	Average£641	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Air Canada	Cheapest£603	Average£768	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Iberia	Cheapest£622	Average£717	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£628	Average£806	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£631	Average£847	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
United Airlines	Cheapest£637	Average£803	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Lufthansa	Cheapest£673	Average£797	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
KLM	Cheapest£713	Average£876	FlexibilityNo cancel fee	On-time75%	Search KLM flights

Cheap flights from London Heathrow Airport to St. Louis from £377

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 2/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from London Heathrow to Lambert-St Louis are usually found in February or March, booked 26 days in advance, depart on a Wednesday or Monday and return on a Tuesday

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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 26 August 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 26 August 2025.

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

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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?

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?

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

What’s the top stopover airport for flights from London Heathrow Airport to St. Louis?

What’s the fastest stopover option from London Heathrow Airport to St. Louis?

What’s the fastest stopover option from London Heathrow Airport to St. Louis?

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to St. Louis?

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Finnair, Air Canada, andIberia from London Heathrow Airport to St. Louis by reading reviews from past customers. Users have also rated airlines 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?

How long is the flight from London Heathrow Airport to St. Louis?

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

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?

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Alternative routes for Heathrow to St. Louis

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Top 10 airlines flying from Heathrow to St. Louis

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

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

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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 26 August 2025.