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

Return flights

15 Sep - 24 Sep	easyJet
17 Sep - 24 Sep	easyJet
30 Sep - 02 Oct	easyJet
02 Sep - 14 Oct	Aegean Airlines
20 Sep - 23 Sep	Wizz Air Malta
16 Sep - 24 Sep	easyJet
15 Sep - 21 Sep	easyJet
16 Sep - 25 Sep	easyJet
02 Sep - 23 Sep	Aegean Airlines
11 Sep - 16 Sep	Transavia France
27 Sep - 30 Sep	Aegean Airlines
09 Sep - 11 Sep	Volotea
24 Sep - 08 Oct	Vueling Airlines
29 Sep - 04 Oct	easyJet
24 Sep - 01 Oct	Vueling Airlines
24 Sep - 14 Oct	Vueling Airlines
24 Sep - 07 Oct	Vueling Airlines
28 Sep - 04 Oct	Wizz Air Malta
17 Sep - 01 Oct	Vueling Airlines
17 Sep - 07 Oct	Vueling Airlines

Also check the deals for one-way flights from Athens 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 Athens to Porto in September from $195

Return flights