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

Return flights

09 Sep - 23 Sep	Air Canada
10 Sep - 25 Sep	Air Canada
09 Sep - 25 Sep	Air Canada
02 Sep - 19 Sep	Air Canada
03 Sep - 19 Sep	Air Canada
10 Sep - 26 Sep	Air Canada
10 Sep - 20 Sep	Hawaiian Airlines
09 Sep - 08 Oct	Air Canada
18 Sep - 02 Oct	Lufthansa
10 Sep - 27 Sep	Spirit Airlines
10 Sep - 28 Sep	Spirit Airlines
19 Sep - 05 Oct	Delta

Also check the deals for one-way flights from Portland 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 Portland to Athens in September from $638

Return flights