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

Return flights

30 Dec - 13 Jan	Turkish Airlines
30 Dec - 13 Jan	Virgin Atlantic	direct
08 Dec - 10 Dec	Icelandair
06 Dec - 13 Dec	Hawaiian Airlines
06 Dec - 16 Dec	Alaska Airlines
10 Dec - 17 Dec	Aer Lingus
16 Dec - 23 Dec	Hawaiian Airlines
26 Dec - 06 Jan	Icelandair
06 Dec - 05 Jan	Alaska Airlines
06 Dec - 10 Dec	Icelandair
06 Dec - 30 Dec	Alaska Airlines
13 Dec - 16 Dec	Alaska Airlines
06 Dec - 18 Dec	Alaska Airlines
06 Dec - 07 Dec	Aeromexico
25 Dec - 04 Jan	Hawaiian Airlines
24 Dec - 01 Jan	Delta	direct
26 Dec - 06 Jan	Air France	direct
25 Dec - 05 Jan	Virgin Atlantic
23 Dec - 02 Jan	Delta
06 Dec - 05 Jan	Air France	direct

Also check the deals for one-way flights from Seattle to Amsterdam 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 Amsterdam in December from 602€

Return flights