Cheap flights from St. Louis to the United Kingdom from £161

The cheapest month to fly to United Kingdom from St. Louis is in April. Flight prices, which tend to average around £89, are often lower during this time because this is during the off-season. If you are unable to visit United Kingdom during the month of April, then departing from St. Louis during the month September is also very affordable. Most momondo users find prices during this month for around £180.

The cheapest day to depart from St. Louis to United Kingdom is on a Friday. Travellers who choose to depart for United Kingdom on a Friday will often find tickets for as low as £483. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to United Kingdom for around £916.

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

You are more likely to see cheaper flights to United Kingdom from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around £674 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from St. Louis for as low as £614 on momondo.

There is only 1 cabin class available to choose from on St. Louis to United Kingdom 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 42% on your flight if you consider stops on a St. Louis to United Kingdom flight.

Historically, on average around 26% of flights between St. Louis and United Kingdom have experienced a delay on any given week. The average delay length over the past 12 months has been 129 minutes.

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

Wednesday is statistically the day of the week that experiences the fewest delays on this flight route. Sunday 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 26% of their flights experiencing any sort of delay.

2 flights are operational daily from St. Louis to United Kingdom as of June 2026. The most popular departure time for this route is 21:00, with 100% of flights per day taking off in the evening.

The number of flights available between St. Louis and United Kingdom is 20 per week as of June 2026. The most frequent departure day is Tue, with 25% of weekly flights leaving on this day.