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

Return flights

01 Dec - 15 Dec	British Airways
02 Dec - 09 Dec	United
03 Dec - 10 Dec	United
08 Dec - 15 Dec	United
07 Dec - 14 Dec	United
13 Dec - 20 Dec	Icelandair
23 Dec - 30 Dec	United
17 Dec - 24 Dec	United
12 Dec - 19 Dec	United
01 Dec - 19 Dec	Delta
28 Dec - 04 Jan	United
27 Dec - 03 Jan	Icelandair

Also check the deals for one-way flights from Seattle to Zurich 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 Zurich in December from 404€

Return flights