To kick off your summer holiday you might be looking for cheap local flights. Velvet Sky airline might just be the answer. They are running “December specials” (which actually are also available on some dates after December, and are available only on some dates in December…but hopefully you’ll get luck and they’ll be there on your dates):
Even on the dates when the special isn’t available I’ve noticed that Velvet Sky airline is often cheapest. You can book the flights by calling 0861-835-838 or at Velvet Sky reservations.