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
31 Aug - 16 Sep	Air Serbia
31 Aug - 10 Sep	TAP
27 Aug - 03 Sep	Vueling Airlines
31 Aug - 08 Sep	TAP
28 Aug - 05 Sep	Vueling Airlines
26 Aug - 03 Sep	Ryanair
29 Aug - 04 Sep	Vueling Airlines
29 Aug - 12 Sep	Vueling Airlines
27 Aug - 05 Sep	Vueling Airlines
16 Aug - 20 Aug	Vueling Airlines
19 Aug - 23 Aug	TAP
19 Aug - 21 Aug	TAP
18 Aug - 21 Aug	TAP
13 Aug - 21 Aug	Vueling Airlines
27 Aug - 30 Aug	TAP
28 Aug - 31 Aug	Vueling Airlines
13 Aug - 17 Aug	Air France
26 Aug - 27 Aug	Vueling Airlines
19 Aug - 26 Aug	TAP

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 $297

Return flights