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

Return flights

05 Dec - 17 Jan	Icelandair
11 Dec - 18 Dec	Virgin Atlantic
30 Dec - 13 Jan	Virgin Atlantic
01 Dec - 08 Dec	Air France	direct
11 Dec - 18 Dec	Air France	direct
30 Dec - 13 Jan	Delta	direct
05 Dec - 17 Jan	Air France	direct
26 Dec - 06 Jan	Delta
23 Dec - 17 Jan	Alaska Airlines
10 Dec - 05 Jan	Hawaiian Airlines
22 Dec - 17 Jan	Icelandair
11 Dec - 05 Jan	Hawaiian Airlines
12 Dec - 04 Jan	Alaska Airlines
18 Dec - 28 Dec	British Airways
19 Dec - 30 Dec	Sun Country Airlines
20 Dec - 28 Dec	WestJet
20 Dec - 23 Dec	WestJet
19 Dec - 30 Dec	Virgin Atlantic	direct
20 Dec - 23 Dec	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 420€

Return flights