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

Return flights

28 Sep - 11 Oct	Scandinavian Airlines
09 Sep - 24 Sep	Turkish Airlines
09 Sep - 19 Sep	Turkish Airlines
16 Sep - 30 Sep	Turkish Airlines
23 Sep - 30 Sep	Turkish Airlines
22 Sep - 10 Oct	Turkish Airlines
12 Sep - 17 Sep	Turkish Airlines
08 Sep - 15 Sep	Turkish Airlines
08 Sep - 04 Oct	Turkish Airlines
14 Sep - 29 Sep	Turkish Airlines
16 Sep - 25 Sep	Delta
22 Sep - 19 Oct	Delta
17 Sep - 01 Oct	Delta
06 Sep - 20 Sep	Frontier Airlines
17 Sep - 27 Sep	Hawaiian Airlines

Also check the deals for one-way flights from Seattle 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 Seattle to Athens in September from 459€

Return flights