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

Return flights

19 Sep - 11 Oct	Scandinavian Airlines
24 Sep - 08 Oct	Turkish Airlines
22 Sep - 10 Oct	Turkish Airlines
16 Sep - 23 Sep	Delta
17 Sep - 01 Oct	Delta
17 Sep - 23 Sep	Delta
14 Sep - 29 Sep	Turkish Airlines
22 Sep - 19 Oct	Delta
09 Sep - 24 Sep	Turkish Airlines
15 Sep - 11 Oct	British Airways
28 Sep - 05 Oct	Lufthansa
14 Sep - 04 Oct	jetBlue
08 Sep - 15 Sep	Condor
08 Sep - 04 Oct	Scandinavian Airlines
05 Sep - 26 Sep	Condor
14 Sep - 28 Sep	Hawaiian Airlines
17 Sep - 27 Sep	WestJet
19 Sep - 28 Sep	Frontier Airlines
05 Sep - 14 Sep	Air Canada

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 $487

Return flights