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

Return flights

30 Sep - 07 Oct	easyJet
30 Sep - 08 Oct	easyJet
11 Sep - 17 Sep	easyJet
24 Sep - 01 Oct	Ryanair
11 Sep - 16 Sep	easyJet
11 Sep - 15 Sep	easyJet
23 Sep - 29 Sep	easyJet
22 Sep - 01 Oct	Wizz Air Malta
23 Sep - 02 Oct	easyJet
17 Sep - 24 Sep	easyJet
29 Sep - 05 Oct	Vueling Airlines
24 Sep - 30 Sep	easyJet
30 Sep - 03 Oct	easyJet
04 Sep - 18 Sep	Vueling Airlines
25 Sep - 02 Oct	easyJet
16 Sep - 30 Sep	easyJet
11 Sep - 23 Sep	easyJet
22 Sep - 30 Sep	Vueling Airlines
24 Sep - 08 Oct	Vueling Airlines
23 Sep - 08 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 144€

Return flights