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

Return flights

22 Sep - 10 Oct	Turkish Airlines
29 Sep - 07 Oct	Turkish Airlines
26 Sep - 09 Oct	Scandinavian Airlines
14 Sep - 29 Sep	Turkish Airlines
17 Sep - 01 Oct	Delta
09 Sep - 24 Sep	Turkish Airlines
28 Sep - 12 Oct	British Airways
28 Sep - 05 Oct	Lufthansa
16 Sep - 25 Sep	Delta
14 Sep - 04 Oct	jetBlue
22 Sep - 19 Oct	Delta
17 Sep - 27 Sep	Delta
12 Sep - 04 Oct	Frontier Airlines
08 Sep - 04 Oct	Scandinavian Airlines
12 Sep - 19 Sep	Frontier Airlines
11 Sep - 18 Sep	Frontier Airlines
19 Sep - 28 Sep	Frontier Airlines
14 Sep - 28 Sep	Alaska 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 $559

Return flights