I found this route from Athens to Singapore with a company I am not familiar to, Scoot. From Singapore there are a lot of flights to any destination in Asia. It is a hub not a city to spend your holidays in cause it is too expensive, though very beautiful and so incredibly clean. If you plan few days in Athens then check our top don’ts and dos about this great city.
Look for other dates but mainly from Tuesday to Tuesday.
I checked a flight from Singapore to Bali and here is the best rate.
Check for festivals in Bali or Bangkok, as I published the 2018 program.