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

Return flights

19 Aug - 26 Aug	SWISS
18 Aug - 25 Aug	Lufthansa
17 Aug - 24 Aug	United
18 Aug - 01 Sep	Icelandair
20 Aug - 27 Aug	SWISS
26 Aug - 08 Sep	SWISS
21 Aug - 29 Aug	Condor
21 Aug - 27 Aug	Condor
16 Aug - 25 Aug	SWISS
17 Aug - 31 Aug	Condor
21 Aug - 13 Sep	Condor
22 Aug - 13 Sep	Condor
29 Aug - 08 Sep	Icelandair
30 Aug - 15 Sep	Condor
16 Aug - 25 Aug	SWISS	direct
18 Aug - 25 Aug	SWISS	direct
18 Aug - 01 Sep	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 385€

Return flights