Cheap flights from London to St. Louis from $386

In general, August is the cheapest month to fly from London to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $91. The month of September is another great option to travel to St. Louis, with average flight prices from London averaging around $170.

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

You are more likely to see cheaper flights to St. Louis from London when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $991 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from London for as low as $813 on momondo.

There are 3 cabin classes available to choose from on London to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 9% on your flight if you consider stops on a London to St. Louis flight.

As of May 2026, prices for London to St. Louis flights are approximately 11% cheaper when compared to flights at the same time last year.

Historically, on average around 0% 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 0 minutes.

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

The number of flights available between London and St. Louis is 2 per day as of May 2026. The most frequent departure time is 4:00PM, with 100% of daily flights leaving in the afternoon.

As of May 2026, 20 flights take off from London and land in St. Louis each week. The most common flight departure day for this route is Tue, with 25% of weekly flights taking off on this day.