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

Return flights

29 Sep - 02 Oct	Scandinavian Airlines
26 Sep - 03 Oct	Turkish Airlines
22 Sep - 30 Sep	Turkish Airlines
27 Sep - 05 Oct	Turkish Airlines
29 Sep - 18 Oct	Turkish Airlines
26 Sep - 18 Oct	Turkish Airlines
26 Sep - 04 Oct	Turkish Airlines
20 Sep - 27 Sep	Turkish Airlines
21 Sep - 27 Sep	Turkish Airlines
29 Sep - 02 Oct	United	direct
26 Sep - 03 Oct	Brussels Airlines	direct
26 Sep - 18 Oct	Brussels Airlines	direct
27 Sep - 05 Oct	Brussels Airlines	direct
20 Sep - 27 Sep	Brussels Airlines	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 $543

Return flights