Question 1

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 £637. Other airlines that can offer you cheap pricing are Lufthansa, from £655, and United Airlines, from £659. Scandinavian Airlines is priced at 9% lower than the current average price of a flight leaving 3 months from now.

Question 2

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

Accepted Answer

For one-way options, check prices for Aer Lingus. According to our data, you can fly for as low as £704. Users have also found prices from £714 and £945 on Finnair and Lufthansa, respectively.

Question 3

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 4

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 5

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 6

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 7

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 8

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 9

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 10

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 61% 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 £516, or £1,069 for flights within the next 24 hours.

Question 11

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 £704. You can even find prices in March for less than £704, as users have found deals to St. Louis from as low as £483. 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 43%.

Question 12

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 13

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. 9 airlines have flights to Lambert-St Louis from London Heathrow on a regular basis.

Question 14

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 15

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 16

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 17

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 18

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 19

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 20

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	£637
One-way from	£313
Popular in	December
Cheapest in	February
Average price	£712

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest£197	Average£756	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Finnair	Cheapest£504	Average£637	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£618	Average£711	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£626	Average£796	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Virgin Atlantic	Cheapest£627	Average£834	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
United Airlines	Cheapest£633	Average£837	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Lufthansa	Cheapest£668	Average£780	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
KLM	Cheapest£710	Average£831	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Air Canada	Cheapest£715	Average£849	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Cheap flights from London Heathrow Airport to St. Louis from £313

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 25/6. 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 September, 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 13 June 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 13 June 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.

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 return flight from Heathrow to St. Louis. Price data was last updated on 9 June 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 13 June 2025.

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

Use this chart to determine the cheapest time to fly return from Heathrow to St. Louis. Price data was last updated on 16 December 2024.

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

To help decide which airline to fly from London to St. Louis, see what other customers have to say about Delta, KLM and Finnair. 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 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?

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 Heathrow to St. Louis

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Top 9 airlines flying from Heathrow to St. Louis

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

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

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 13 June 2025.