BELFAST, 2014-10-1 — /Travel PR News/ — Balkan Holidays, www.balkanholidays.co.uk  the leading tour operator to Bulgaria, has announced that due to demand, it will be adding four additional departure flights from Belfast to Bourgas, Bulgaria, next  Summer 2015. The additional flights will extend the holiday season by providing three extra weekly fights from 25 May… Read the full press release