Flights
Cheap flights to Bulgaria (all company names are links to their web-sites):
Ryanair - from London-Stansted to Plovdiv
Jetairfly to Varna only in May - October
Wizzair to Sofia, from Warsaw, London and Prague to Burgas, from London to Varna
easyJet to Sofia, from London and Manchester
Regular flights to Bulgaria (all company names are links to their web-sites):
Bulgaria air - to Sofia, Varna, Burgas