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

Return flights

30 Sep - 04 Oct	easyJet
28 Sep - 04 Oct	easyJet
30 Sep - 09 Oct	easyJet
30 Sep - 07 Oct	easyJet
21 Sep - 07 Oct	easyJet
10 Sep - 16 Sep	easyJet
22 Sep - 29 Sep	easyJet
21 Sep - 25 Sep	easyJet
10 Sep - 17 Sep	easyJet
11 Sep - 16 Sep	easyJet
17 Sep - 24 Sep	easyJet
09 Sep - 16 Sep	easyJet
09 Sep - 30 Sep	Wizz Air Malta
21 Sep - 30 Sep	Ryanair
09 Sep - 18 Sep	Wizz Air Malta
30 Sep - 14 Oct	Vueling Airlines
30 Sep - 15 Oct	Vueling Airlines
28 Sep - 05 Oct	easyJet
27 Sep - 14 Oct	Vueling Airlines
27 Sep - 15 Oct	Vueling Airlines

Also check the deals for one-way flights from Porto to Athens 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 Porto to Athens in September from 147€

Return flights