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

Return flights

01 Dec - 08 Dec	British Airways
02 Dec - 09 Dec	British Airways
03 Dec - 10 Dec	British Airways
04 Dec - 11 Dec	British Airways
08 Dec - 15 Dec	British Airways
05 Dec - 12 Dec	British Airways
09 Dec - 16 Dec	British Airways
06 Dec - 13 Dec	Air France
07 Dec - 14 Dec	Air France
04 Dec - 18 Dec	British Airways
15 Dec - 10 Jan	Icelandair
31 Dec - 07 Jan	Lufthansa
29 Dec - 05 Jan	Air France
30 Dec - 06 Jan	Lufthansa
25 Dec - 01 Jan	Virgin Atlantic
09 Dec - 03 Jan	WestJet
12 Dec - 03 Jan	Frontier Airlines
27 Dec - 03 Jan	KLM
28 Dec - 04 Jan	Air France
20 Dec - 04 Jan	Sun Country 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 381€

Return flights