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

Return flights

08 Dec - 22 Dec	Aer Lingus
11 Dec - 25 Dec	Hawaiian Airlines
16 Dec - 17 Jan	Icelandair
25 Dec - 08 Jan	Condor
08 Dec - 22 Dec	Air France	direct
25 Dec - 08 Jan	Air France	direct
13 Dec - 28 Dec	Icelandair
11 Dec - 25 Dec	Air France	direct
19 Dec - 25 Dec	Air Canada
22 Dec - 05 Jan	British Airways
16 Dec - 17 Jan	Air France	direct
19 Dec - 25 Dec	Air France	direct
22 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 654€

Return flights