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

Return flights

22 Aug - 04 Sep	Scandinavian Airlines
20 Aug - 10 Sep	United
24 Aug - 29 Aug	Scandinavian Airlines
25 Aug - 08 Sep	United
15 Aug - 29 Aug	United
16 Aug - 23 Aug	Frontier Airlines
13 Aug - 25 Aug	Turkish Airlines
14 Aug - 25 Aug	Turkish Airlines
06 Aug - 13 Aug	Condor
15 Aug - 24 Aug	Lufthansa
02 Aug - 09 Aug	Scandinavian Airlines

Also check the deals for one-way flights from Seattle to Athens in August.

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 August from 469€

Return flights