AirHint found the following cheapest return flights from San Francisco (SFO) to Vienna (VIE) in September 2025 (see full year).

Return flights

08 Sep - 15 Sep	Condor
29 Sep - 13 Oct	Condor
24 Sep - 28 Sep	Condor
02 Sep - 09 Sep	United
11 Sep - 18 Sep	United
14 Sep - 21 Sep	United
05 Sep - 12 Sep	United
17 Sep - 24 Sep	United
23 Sep - 30 Sep	United
26 Sep - 03 Oct	United
29 Sep - 06 Oct	United
20 Sep - 27 Sep	United

Also check the deals for one-way flights from San Francisco to Vienna 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 San Francisco to Vienna in September from 434€

Return flights