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

Return flights

01 Dec - 21 Dec	Ryanair
01 Dec - 21 Dec	Lufthansa	direct
09 Dec - 13 Dec	Lufthansa	direct
10 Dec - 14 Dec	Lufthansa	direct
11 Dec - 15 Dec	Lufthansa	direct
12 Dec - 16 Dec	Lufthansa	direct
08 Dec - 12 Dec	Air Serbia
03 Dec - 07 Dec	Lufthansa	direct
27 Dec - 03 Jan	Wizz Air	direct
19 Dec - 02 Jan	Air Serbia
21 Dec - 03 Jan	Ryanair	direct
18 Dec - 03 Jan	Wizz Air	direct
20 Dec - 21 Dec	Wizz Air	direct
08 Dec - 12 Dec	Lufthansa	direct

Also check the deals for one-way flights from Frankfurt 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 Frankfurt to Sofia in December from $151

Return flights