The international line from Pescara to Hvar island by SNAV started on July 18, 2015 and will be available until September 6, 2015. Stari Grad is connected to Pescara almost daily, either via Hvar on Mondays, Fridays, Saturdays and Sundays or via Vela Luka on Tuesdays and Thursdays (no connection on Wednesdays). Here is the schedule with departure and arrival times from the SNAV website.