At the moment, there are 13 airlines flying to Bangkok. Go through the results to find the right flights for you – you can adjust the filters to see find even more flights to Bangkok.
Air China is the most popular airline that flies from New Tokyo International Airport to Bangkok. But it's still worth looking at other options, as there are 50 flights to Bangkok every week. If you want to broaden your search, look at flights departing from other airports.
The distance between to Bangkok is 4653 km. Normally, it takes about 14 hrs to fly, and you can definitely expect the journey to be at least 10 hrs 25 mins. You can see the various flight times in the results.
Searching by month, for instance, will show you the best time of the week to fly.