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

Return flights

05 Dec - 07 Dec	Hawaiian Airlines
23 Dec - 30 Dec	Condor
13 Dec - 31 Dec	British Airways
18 Dec - 30 Dec	Condor
14 Dec - 28 Dec	Delta
17 Dec - 31 Dec	Icelandair
13 Dec - 03 Jan	Austrian Airlines
21 Dec - 26 Dec	Turkish Airlines

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

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 December from 573€

Return flights