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

Return flights

30 Sep - 09 Oct	Ryanair
29 Sep - 10 Oct	Ryanair
16 Sep - 24 Sep	Air Europa
30 Sep - 07 Oct	easyJet
17 Sep - 24 Sep	Air Europa
10 Sep - 22 Sep	Air Europa
16 Sep - 22 Sep	Air Europa
17 Sep - 30 Sep	Air Europa
09 Sep - 16 Sep	Air Europa
30 Sep - 11 Oct	easyJet
10 Sep - 15 Sep	Air Europa
17 Sep - 26 Sep	Air Europa
10 Sep - 17 Sep	Air Europa
25 Sep - 07 Oct	easyJet
24 Sep - 01 Oct	easyJet
10 Sep - 16 Sep	Air Europa
27 Sep - 01 Oct	easyJet
28 Sep - 10 Oct	Ryanair
25 Sep - 01 Oct	easyJet
30 Sep - 04 Oct	easyJet

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 155€

Return flights