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

Return flights

25 Aug - 25 Sep	Vueling Airlines
26 Aug - 02 Sep	Ryanair
27 Aug - 03 Sep	Ryanair
31 Aug - 16 Sep	Air Serbia
31 Aug - 03 Sep	Air Serbia
28 Aug - 05 Sep	Vueling Airlines
28 Aug - 09 Sep	Vueling Airlines
31 Aug - 10 Sep	Air Serbia
29 Aug - 07 Sep	Vueling Airlines
31 Aug - 07 Sep	Air Serbia
18 Aug - 21 Aug	TAP
12 Aug - 16 Aug	KLM
27 Aug - 30 Aug	TAP
15 Aug - 17 Aug	Volotea
14 Aug - 16 Aug	Air France
19 Aug - 26 Aug	TAP
13 Aug - 17 Aug	Air France
26 Aug - 30 Aug	Vueling Airlines
12 Aug - 21 Aug	TAP
28 Aug - 30 Aug	Vueling Airlines

Also check the deals for one-way flights from Porto to Athens 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 Athens in August from 272€

Return flights