AirHint found the following cheapest return flights from Washington (IAD) to Zurich (ZRH) in September 2026 (see full year).

Return flights

05 Sep - 11 Sep	Scandinavian Airlines
01 Sep - 11 Sep	Turkish Airlines
19 Sep - 26 Sep	Scandinavian Airlines
19 Sep - 27 Sep	Scandinavian Airlines
18 Sep - 26 Sep	Turkish Airlines
23 Sep - 30 Sep	SWISS	direct
01 Sep - 11 Sep	SWISS	direct
19 Sep - 26 Sep	SWISS	direct
18 Sep - 26 Sep	SWISS	direct
19 Sep - 27 Sep	SWISS	direct

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

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 Washington to Zurich in September from 465€

Return flights