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

Return flights

11 Dec - 14 Dec	Ryanair
07 Dec - 14 Dec	Ryanair
10 Dec - 14 Dec	Transavia France
04 Dec - 11 Dec	Ryanair
06 Dec - 11 Dec	easyJet
08 Dec - 13 Dec	Ryanair
21 Dec - 01 Jan	Ryanair
03 Dec - 07 Dec	Ryanair
01 Dec - 02 Dec	Wizz Air Malta
04 Dec - 05 Dec	Ryanair
22 Dec - 01 Jan	Ryanair
06 Dec - 08 Dec	easyJet
20 Dec - 01 Jan	Ryanair
31 Dec - 04 Jan	Wizz Air Malta
27 Dec - 01 Jan	Wizz Air Malta
26 Dec - 02 Jan	Vueling Airlines

Also check the deals for one-way flights from Porto 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 Porto to Sofia in December from 112€

Return flights