We've gone through lots of different flights, to help you find the cheapest way to get from London Heathrow to Key West. You can choose from three airlines. At the moment, 01 / Nov / 2025 is the cheapest date to travel, but scroll through the results to find the option that works best for you.
British Airways is the most popular airline that flies from London Heathrow to Key West. But it's still worth looking at other options, as there are 35 flights to Key West every week. If you want to broaden your search, look at flights departing from other airports.
Generally speaking, the flight from London Heathrow to Key West takes around 13 hrs 15 mins. The fastest flight takes 12 hrs 35 mins to cover the 7316 km distance. You can view all flight times yourself in the results list.
You can also search by month, which will reveal the cheapest time of the week to fly.
