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

Return flights

14 Sep - 05 Oct	Hawaiian Airlines
02 Sep - 16 Sep	Air Canada
05 Sep - 19 Sep	Hawaiian Airlines
21 Sep - 28 Sep	Hawaiian Airlines
09 Sep - 16 Sep	United
03 Sep - 10 Sep	United
14 Sep - 28 Sep	Brussels Airlines
12 Sep - 19 Sep	United
01 Sep - 08 Sep	United
05 Sep - 12 Sep	United
24 Sep - 01 Oct	United
30 Sep - 07 Oct	United
07 Sep - 14 Sep	United
27 Sep - 04 Oct	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 $641

Return flights