AirHint found the following cheapest return flights from Athens (ATH) to Porto (OPO) in August 2025 (see full year).

Return flights

20 Aug - 07 Sep	Vueling Airlines
03 Aug - 03 Sep	Air Serbia
21 Aug - 28 Aug	SWISS
19 Aug - 07 Sep	Vueling Airlines
03 Aug - 07 Aug	Air Serbia
20 Aug - 09 Sep	Vueling Airlines
22 Aug - 26 Aug	SWISS
21 Aug - 26 Aug	SWISS
12 Aug - 21 Aug	Austrian Airlines
27 Aug - 03 Sep	Lufthansa
12 Aug - 02 Sep	Austrian Airlines
19 Aug - 09 Sep	Vueling Airlines
05 Aug - 18 Sep	Austrian Airlines
28 Aug - 01 Sep	SWISS
20 Aug - 03 Sep	Vueling Airlines
18 Aug - 27 Aug	SWISS
23 Aug - 28 Aug	SWISS
19 Aug - 28 Aug	SWISS
03 Aug - 06 Aug	Air Serbia
23 Aug - 29 Aug	SWISS

Also check the deals for one-way flights from Athens to Porto 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.

Book a cheap hotel in Porto

Cheap car rent in Porto

Cheapest return flights from Athens to Porto in August from $289

Return flights