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

Return flights

04 Sep - 11 Sep	Icelandair
16 Sep - 23 Sep	Icelandair
10 Sep - 17 Sep	Icelandair
28 Sep - 05 Oct	Icelandair
25 Sep - 02 Oct	Icelandair
22 Sep - 29 Sep	Icelandair
14 Sep - 22 Sep	Icelandair
13 Sep - 20 Sep	Icelandair
07 Sep - 14 Sep	Icelandair
19 Sep - 26 Sep	Icelandair
01 Sep - 08 Sep	Icelandair
06 Sep - 14 Sep	Scandinavian Airlines
28 Sep - 05 Oct	United	direct
25 Sep - 02 Oct	United	direct

Also check the deals for one-way flights from Boston 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 Boston to Zurich in September from 363€

Return flights