WIZZ AIR. I flew with them last week cost about £100 return 2 of us from Luton prices start from £3.99 the earlier you book. No complaints at all on time and everything. Got bus down to Pamps cost 16 Lev about £4.00
Heard a buzz that Easy Jet have applied for routes to Sofia and Ryan Air have applied to Plovdiv. Be interested to hear if anyone else knows of the possibility. Be great if they open up Plovdiv to commercial flights - just have to do something about the waiting area
Would recommend wizzair too, flew with them a couple of weeks ago from Luton. We paid £64 return inc taxes, booked 2 months in advance. Paid £18 each way to take a snowboard bag as special baggage.
Got a good video of a plane taking off while we were in the car park (mid length stay), that was cheap also if you pre-book.