AirHint found the following cheapest return flights from London (LHR) to Sofia (SOF) in December 2025 (see full year).

Return flights

06 Dec - 08 Dec	British Airways	direct
03 Dec - 08 Dec	British Airways	direct
02 Dec - 07 Dec	Eurowings
03 Dec - 05 Dec	Lufthansa
05 Dec - 08 Dec	Lufthansa
04 Dec - 08 Dec	Lufthansa
11 Dec - 15 Dec	Lufthansa
02 Dec - 02 Dec	Lufthansa
05 Dec - 07 Dec	Lufthansa
16 Dec - 07 Jan	Lufthansa
08 Dec - 23 Jan	Lufthansa
11 Dec - 09 Jan	Lufthansa
15 Dec - 22 Dec	Lufthansa
15 Dec - 15 Jan	Lufthansa
15 Dec - 19 Jan	Lufthansa
31 Dec - 07 Jan	Austrian Airlines
27 Dec - 07 Jan	Austrian Airlines
26 Dec - 11 Jan	Austrian Airlines
29 Dec - 05 Jan	Lufthansa
27 Dec - 05 Jan	Austrian Airlines

Also check the deals for one-way flights from London to Sofia in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Sofia in December from $139

Return flights