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

Return flights

04 Sep - 11 Sep	Icelandair
01 Sep - 16 Sep	Icelandair
09 Sep - 16 Sep	Air Canada
11 Sep - 18 Sep	Icelandair
01 Sep - 08 Sep	ITA Airways
02 Sep - 09 Sep	United	direct
24 Sep - 01 Oct	United	direct
05 Sep - 12 Sep	United	direct
11 Sep - 18 Sep	United	direct
04 Sep - 11 Sep	United	direct
01 Sep - 08 Sep	United	direct
29 Sep - 06 Oct	United	direct

Also check the deals for one-way flights from Washington 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 Washington to Geneva in September from $500

Return flights