Search for cheap flights and last-minute deals with Netflights. We've scanned all the flights from London Heathrow to Knoxville, across the six airlines that offer this route. We've found that 09 / Dec / 2025 is the cheapest date to travel at the moment, but it's best to go through the results to see which flight suits you.
British Airways is the most popular airline that flies from London Heathrow to Knoxville. But it's still worth looking at other options, as there are 121 flights to Knoxville every week. If you want to broaden your search, look at flights departing from other airports.
Generally speaking, the flight from London Heathrow to Knoxville takes around 13 hrs 10 mins. The fastest flight takes 11 hrs 50 mins to cover the 6568 km distance. You can view all flight times yourself in the results list.
If you want to travel in August, it's best to book your flights early, as this is peak season in Knoxville. The cheapest month to fly is normally January – try searching three to four months prior to then to get a bargain. You can also search by month, which will reveal the cheapest time of the week to fly.
