Cheapest return flights from Seattle to Zurich in September from $425

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

Return flights

24 Sep - 18 Oct Scandinavian Airlines
22 Sep - 18 Oct Scandinavian Airlines
23 Sep - 07 Oct SWISS
24 Sep - 07 Oct SWISS
24 Sep - 04 Oct Scandinavian Airlines
15 Sep - 10 Oct Delta
14 Sep - 22 Sep Lufthansa
24 Sep - 03 Oct SWISS
22 Sep - 03 Oct SWISS
24 Sep - 06 Oct Air Canada
14 Sep - 20 Sep Lufthansa
25 Sep - 07 Oct Air Canada
14 Sep - 21 Sep Condor
12 Sep - 16 Sep Scandinavian Airlines
21 Sep - 26 Sep Condor
19 Sep - 26 Sep Condor
14 Sep - 19 Sep Scandinavian Airlines

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

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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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