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

Return flights

30 Sep - 04 Oct	Wizz Air
16 Sep - 19 Sep	Wizz Air
30 Sep - 03 Oct	Wizz Air
26 Sep - 03 Oct	Ryanair
25 Sep - 30 Sep	Wizz Air
25 Sep - 29 Sep	Ryanair
24 Sep - 30 Sep	Wizz Air
29 Sep - 04 Oct	Ryanair
25 Sep - 02 Oct	Wizz Air
15 Sep - 19 Sep	Wizz Air
23 Sep - 28 Sep	Ryanair
18 Sep - 23 Sep	Ryanair
08 Sep - 12 Sep	Ryanair
18 Sep - 21 Sep	Wizz Air
08 Sep - 13 Sep	Ryanair

Also check the deals for one-way flights from Sofia to Porto in September.

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 Sofia to Porto in September from $157

Return flights