If you want a cheap flight from Exeter to Tokyo, you've got one airlines to choose from.
Make sure you use the search options above to search for flights to other airports in Tokyo, not just New Tokyo International Airport. The more options you look at, the better your chance of finding a cheap deal. Just so you know, the flight typically takes 24 hrs 35 mins.
There are about one flights to or via Tokyo every week, so you have plenty of options.
During this peak season, accommodation prices often increase too, so it's best to book early. Or you could keep your fingers crossed and hold out for a last-minute deal.