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

Return flights

12 Dec - 15 Dec	easyJet
06 Dec - 07 Dec	Vueling Airlines
05 Dec - 07 Dec	easyJet
21 Dec - 29 Dec	easyJet
26 Dec - 29 Dec	easyJet
20 Dec - 27 Dec	Air Serbia
28 Dec - 04 Jan	SWISS
25 Dec - 03 Jan	Air Serbia
20 Dec - 03 Jan	Air Serbia
31 Dec - 04 Jan	Air Serbia
19 Dec - 04 Jan	Air Serbia
20 Dec - 04 Jan	Air Serbia
18 Dec - 04 Jan	Air Serbia
28 Dec - 04 Jan	SWISS	direct
25 Dec - 04 Jan	Air Serbia

Also check the deals for one-way flights from Zurich 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 Zurich to Sofia in December from $183

Return flights