AirHint found the following cheapest return flights from Porto (OPO) to Sofia (SOF) in August 2026 (see full year).

Return flights

13 Aug - 20 Aug	Air Serbia
02 Aug - 07 Aug	Air Serbia
05 Aug - 13 Aug	Austrian Airlines
06 Aug - 13 Aug	Air Serbia
02 Aug - 13 Aug	Air Serbia
02 Aug - 09 Aug	Air Serbia
17 Aug - 31 Aug	Air Europa
27 Aug - 06 Sep	Air Europa
03 Aug - 13 Aug	Iberia
25 Aug - 27 Aug	Iberia
21 Aug - 28 Aug	Iberia

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

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 August from $247

Return flights