Heathrow advantage: Direct tube from Gloucester Rd → T4, £2.40, 40min. No train connections, no schlep. You take a backpack. With 10kg carry-on max + 2 backpacks: no checked luggage needed on any airline.
✈️ Flights: London ↔ Sofia
Airline
From
Round Trip
Duration
Airport Transport (2pax)
True Total
Bulgaria Air
LHR
€207–381 (~€280)
3h20m
£10 (Tube, direct)
€290
British Airways
LHR
€152
3h10m
£10 (Tube, direct)
€162
Wizz Air
LTN
€94
3h15m
£40–108 (train)
€141–222
Ryanair
STN
€77
3h00m
£62 (Stansted Express)
€150
Bulgaria Air Daily FB852: 08:55→14:05 or 17:55→23:15 · A220-100/300. BA 5x daily 08:10→20:50. Wizz 11x week LTN 08:20/15:40/21:20. Ryanair 16x week STN 05:55→20:15.