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

Return flights

23 Aug - 30 Aug	Scandinavian Airlines
18 Aug - 25 Aug	Scandinavian Airlines
16 Aug - 30 Aug	Scandinavian Airlines
21 Aug - 28 Aug	Icelandair
24 Aug - 31 Aug	Icelandair
16 Aug - 23 Aug	Icelandair
19 Aug - 26 Aug	Icelandair
18 Aug - 25 Aug	SWISS	direct
22 Aug - 29 Aug	Icelandair
25 Aug - 01 Sep	Icelandair
28 Aug - 04 Sep	Icelandair
31 Aug - 07 Sep	Icelandair
25 Aug - 01 Sep	SWISS	direct
23 Aug - 30 Aug	SWISS	direct

Also check the deals for one-way flights from Seattle to Zurich in August.

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 August from $465

Return flights