Lots of luxury coaches go to Khulna from Dhaka, the capital. Eagle, Hanif and Shohagh Paribahan (Transports) are some of them. Thery have saloon coach and AC saloon coach. Its nearly 6/7 hours journey, have to croos the Padma river by ferry. The fare is around 300 to 400 BDT. You can get the ticket from Kalabagan, Dhaka, or Gabtoli Bus Stand, Dhaka. Search the websites for their contact no.