There are 38 direct and indirect flights connecting Delhi and Tokyo every week, with the journey taking 14 hrs 35 mins on average.
Or, if you're fairly flexible on dates, try to get a last minute-deal by regularly checking the Netflights website.
In Tokyo, New Tokyo International Airport (NRT) is usually the cheapest airport to fly to, but there are one airports to choose from. Not sure who to fly with? Jet Airways, China Eastern Airlines & All Nippon are the most popular airlines available from Delhi.
If you can’t quite find what you’re looking for, try checking the cost of flights to other cities in Japan.