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

Return flights

02 Sep - 09 Sep	Air Canada
03 Sep - 10 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
23 Sep - 30 Sep	Air Canada
17 Sep - 24 Sep	Air Canada
24 Sep - 01 Oct	Air Canada
04 Sep - 11 Sep	Air Canada
11 Sep - 18 Sep	Air Canada
18 Sep - 25 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
01 Sep - 08 Sep	Air Canada
29 Sep - 06 Oct	Air Canada
25 Sep - 02 Oct	Turkish Airlines
30 Sep - 07 Oct	Turkish Airlines
14 Sep - 11 Oct	Scandinavian Airlines
26 Sep - 03 Oct	Turkish Airlines
22 Sep - 10 Oct	Turkish Airlines
27 Sep - 04 Oct	Icelandair
28 Sep - 05 Oct	Lufthansa
22 Sep - 19 Oct	Delta

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 455€

Return flights