Cheap flights from London Heathrow Airport to St. Louis from £354

The month of February is, on average, the cheapest month to fly to St. Louis from London Heathrow Airport, with most prices found around £554. If you’re not able to fly to St. Louis in February, then September is your next best option. Flight prices from London Heathrow Airport to St. Louis during September average around £661.

Our data shows that Saturday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as £595. Flights from London Heathrow Airport to St. Louis on a Sunday will generally be more expensive and average around £927. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

Fly from London Heathrow to Lambert-St Louis for the best London Heathrow - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around £766 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London Heathrow Airport for as low as £600 on momondo.

There are 2 cabin classes available to choose from on London Heathrow Airport to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to St. Louis.

United Airlines is the most popular carrier operating from London Heathrow to Lambert-St Louis

British Airways, Virgin Atlantic and United Airlines are the top three most popular airlines that fly to St. Louis from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 53% of people opting to fly with this airline when travelling to St. Louis. Keep in mind that there are 9 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Historically, on average around 11% of flights between London and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 117 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.

Friday is statistically the day of the week that experiences the fewest delays on this flight route. Wednesday has historically seen more delays on average compared to the rest of the week.

According to our data, British Airways have had the fewest delays on this route over the last 12 months, with about 11% of their flights experiencing any sort of delay.

Chicago (ORD) was the most common stop: 45% of momondo users choosing one-stop flights on this route connected there.

Flights via Toronto (YYZ) offer the lowest average return price of £614.

Flights connecting via Toronto (YYZ) have the shortest average one-way travel time: 11h 32m.

Charlotte (CLT) has the shortest average stopover time for this route: 1h 52m.

As of July 2026, 2 flights take off from London Heathrow Airport and land in St. Louis each day. The most common flight departure time for this route is 16:00, with 100% of daily flights taking off in the afternoon.

20 flights are operational weekly from London Heathrow Airport to St. Louis as of July 2026. The most popular departure day for this route is Tue, with 25% of flights per week taking off on this day.