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

Return flights

06 Dec - 15 Dec	Ryanair
05 Dec - 07 Dec	Ryanair
11 Dec - 14 Dec	Ryanair
08 Dec - 14 Dec	Ryanair
10 Dec - 13 Dec	Ryanair
13 Dec - 16 Dec	easyJet
13 Dec - 17 Dec	Ryanair
01 Dec - 07 Dec	Ryanair
05 Dec - 11 Dec	Ryanair
02 Dec - 05 Dec	Ryanair
29 Dec - 06 Jan	Air Serbia
29 Dec - 05 Jan	Air Serbia
27 Dec - 01 Jan	Ryanair
28 Dec - 05 Jan	Ryanair
23 Dec - 03 Jan	Ryanair
27 Dec - 03 Jan	Ryanair

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 $138

Return flights