There are two airlines offering flights to Tokyo. The most direct route isn’t necessarily the cheapest – being flexible is key to finding the lowest airfare rates. For example, try searching by month to see the best time of the week to fly.
You can use the filters on your search to see more flights and find cheaper rates – Tokyo has more than one airport. So if you don't need to fly into Tokyo Haneda International Airport, it's worth checking your other options. The 9110 km flight usually takes about 19 hrs 30 mins.
30 flights go to or via Tokyo every week. The most popular airline is Qatar Airways but do spend some time checking all your options – they aren’t necessarily the cheapest airline to book with.
If you're planning on going to Tokyo during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.