Q: How much does it cost for a return flight from London Heathrow Airport to St. Louis?

Airfare is below average for this route at the moment. London Heathrow Airport to St. Louis flights typically cost between £721 and £1,098 in September. The cheapest return price found within the last 5 days was £615 on Lufthansa (2 Sept–23 Sept).

Question 1

What is the most punctual flight time for London to St. Louis flights?

Accepted Answer

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

Question 2

How often are flights from London to St. Louis delayed?

Accepted Answer

About 11% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 117 minutes.

Question 3

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

Accepted Answer

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £378.

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 36% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.

Question 5

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

Accepted Answer

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 11h 05m.

Question 6

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Friday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Question 7

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

Accepted Answer

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

Question 8

Which airline has the best punctuality record on London to St. Louis flights?

Accepted Answer

Over the past year, British Airways have had the lowest number of delays on this route, with just 11% of flights being delayed.

Question 9

How much does it cost for a return flight from London Heathrow Airport to St. Louis?

Accepted Answer

Airfare is below average for this route at the moment.London Heathrow Airport to St. Louis flights typically cost between £721 and £1,098 in September.
The cheapest return price found within the last 5 days was £615 on Lufthansa (2 Sept–23 Sept).

Question 10

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 15h 41m. London Heathrow Airport and St. Louis are separated by a distance of 4186 mi. This flight may include one or multiple stops.

Question 11

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 £223. Other airlines that can offer you cheap pricing are Aer Lingus, from £371, and Lufthansa, from £427. American Airlines is priced at 71% lower than the current average price of a flight leaving 3 months from now.

Question 12

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 British Airways. According to our data, you can fly for as low as £346. Users have also found prices from £361 and £365 on United Airlines and Finnair, respectively.

Question 13

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 25 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 14

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 £559). Flying from London Heathrow Airport to St. Louis in July is currently the most expensive (average of £1,005). 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 15

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 16

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 17

What are the cheapest flights from London Heathrow Airport to St. Louis?

Accepted Answer

While on average a flight from London Heathrow Airport to St. Louis is generally £1,002, our data shows the cheapest flight currently is £658. When looking at the most popular route, (London Heathrow - Lambert-St Louis), you can expect to pay £568 for that flight.

Question 18

What are the most reliable airlines from London Heathrow Airport to St. Louis?

Accepted Answer

The top 3 most reliable airlines when flying from London Heathrow Airport to St. Louis are American Airlines (82%), Aer Lingus (82%) and Finnair (82%).

Question 19

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: British Airways, Virgin Atlantic or United Airlines.

Question 20

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

Accepted Answer

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to St. Louis as you normally would.

Question 21

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

Question 22

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 23

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 24

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 25

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 26

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 27

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 28

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	£615
One-way from	£325
Popular in	July
Cheapest in	February
Average price	£1,005
Good round-trip deal	£831 or less
Good one-way deal	£863 or less

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest£223	Average£745	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Aer Lingus	Cheapest£371	Average£734	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Lufthansa	Cheapest£427	Average£724	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
United Airlines	Cheapest£477	Average£711	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£485	Average£766	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
KLM	Cheapest£508	Average£753	FlexibilityNo cancel fee	On-time75%	Search KLM flights
Virgin Atlantic	Cheapest£560	Average£775	FlexibilityNo cancel fee	On-time72%	Search Virgin Atlantic flights
Finnair	Cheapest£565	Average£709	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Air Canada	Cheapest£573	Average£709	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

Cheap flights from London Heathrow Airport to St. Louis from £325

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 7/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 29 July 2026.

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 29 July 2026.

Best flights from Heathrow to St. LouisDiscover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 29 July 2026.

Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 29 July 2026.

Direct flights from Heathrow to St. LouisExplore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 29 July 2026.

Explore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 29 July 2026.

Last-minute flights from Heathrow to St. LouisDiscover last-minute flight deals from Heathrow to St. Louis. Data last updated 29 July 2026 and is based on user searches.

Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 29 July 2026 and is based on user searches.

One-way flights from Heathrow to St. LouisSearch for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated 29 July 2026.

Search for one-way flight options from Heathrow to St. Louis. Find affordable one-way fares based on user searches. Data last updated 29 July 2026.

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Cheapflights Fare Finder

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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

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

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 25 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 London Heathrow Airport to St. Louis?

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to St. Louis as you normally would.

How much does it cost for a return flight from London Heathrow Airport to St. Louis?

Airfare is below average for this route at the moment.

London Heathrow Airport to St. Louis flights typically cost between £721 and £1,098 in September.The cheapest return price found within the last 5 days was £615 on Lufthansa (2 Sept–23 Sept).

How often are flights from London to St. Louis delayed?

About 11% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 117 minutes.

What is the most punctual flight time for London to St. Louis flights?

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Friday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to St. Louis flights?

Over the past year, British Airways have had the lowest number of delays on this route, with just 11% of flights being delayed.

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

Chicago (ORD) – chosen by Cheapflights users on 36% of one-stop itineraries from London Heathrow Airport to St. Louis on Cheapflights.

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

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £378.

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

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 11h 05m.

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

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Virgin Atlantic,United Airlines, andAmerican Airlines 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

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?

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

What are the most reliable airlines from London Heathrow Airport to St. Louis?

What are the cheapest flights from London Heathrow Airport to St. Louis?

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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Complete your trip

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Heathrow and St. Louis flights

Browse other Heathrow and St. Louis flight options. Last updated on 29 July 2026.

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Other flights 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 29 July 2026.

Best flights from Heathrow to St. Louis
Discover carefully curated flight deals from Heathrow to St. Louis that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 29 July 2026.

Direct flights from Heathrow to St. Louis
Explore direct flight options from Heathrow to St. Louis based on user searches, and compare prices and availability for your desired travel dates. Data last updated 29 July 2026.

Last-minute flights from Heathrow to St. Louis
Discover last-minute flight deals from Heathrow to St. Louis. Data last updated 29 July 2026 and is based on user searches.

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 29 July 2026.

London Heathrow Airport to St. Louis flights typically cost between £721 and £1,098 in September.
The cheapest return price found within the last 5 days was £615 on Lufthansa (2 Sept–23 Sept).