Kingfisher flies this route in 2010.
They seem to offer 6 flights a week.
Flight IT 032 leaves Hong Kong at 5:55 pm and arrives in Delhi at 9:35 pm.
JetAirways flies this route with their A330-200 in 2010.
Flight 9W75 leaves Hong Kong at 7:50 pm and arrives in Delhi at 00:20 am.