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

Return flights

10 Sep - 17 Sep	United
07 Sep - 23 Sep	Aer Lingus
04 Sep - 11 Sep	Icelandair
30 Sep - 07 Oct	United
16 Sep - 23 Sep	United
24 Sep - 01 Oct	United
16 Sep - 30 Sep	United
17 Sep - 24 Sep	United
02 Sep - 27 Sep	Aer Lingus
29 Sep - 06 Oct	SWISS
28 Sep - 05 Oct	Aer Lingus
08 Sep - 15 Sep	United
25 Sep - 29 Sep	Air Canada
28 Sep - 18 Oct	Aer Lingus
13 Sep - 04 Oct	Aer Lingus
17 Sep - 22 Sep	United
25 Sep - 02 Oct	United

Also check the deals for one-way flights from Boston to Geneva 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 Geneva in September from 345€

Return flights