£257 Find Cheap Flights from St. Louis to London Heathrow Airport – Compare and Save

If your flying dates are flexible, you should consider flying to London Heathrow Airport on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Tuesday is the most expensive day to fly from St. Louis to London Heathrow Airport. For your return ticket, we recommend flying on a Saturday and avoiding Sundays for the best deals.

The cheapest month for flights from St. Louis to London Heathrow Airport is April, where tickets cost £600 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £1,156 and £1,020 respectively.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £921 on average.

To get a below average price on the flight from St. Louis to London Heathrow Airport, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Weekly flights between St. Louis and London historically see delays in approximately 18% of cases, with the average delay over the past year being 114 minutes.

Typically, flights leaving in the evening tend to face fewer delays, whereas flights at night have historically encountered delays more often.

Statistically, Monday is the day of the week with the fewest delays on this flight route, while Wednesday has typically experienced more delays than other days.

Based on our data, British Airways have experienced the fewest delays on this route in the past 12 months, with only about 18% of their flights encountering any delays.

Chicago (ORD) is the top choice – 40% of KAYAK users who clicked on one-stop flights from St. Louis to London Heathrow Airport picked an itinerary connecting there.

Flights via Frankfurt am Main (FRA) offer the most affordable fares, with an average price of £547 for a return.

Consider flying via Chicago (ORD) for the shortest journey. The average one-way travel time for flights connecting there is 10h 26m.

If you prefer a quick connection, Frankfurt am Main (FRA) often has the shortest stopovers from St. Louis to London Heathrow Airport, with an average time of 1h 38m.