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

Return flights

22 Sep - 29 Sep	TAP
24 Sep - 08 Oct	TAP
21 Sep - 05 Oct	Condor
03 Sep - 30 Sep	Hawaiian Airlines
03 Sep - 18 Sep	Hawaiian Airlines
03 Sep - 10 Sep	United
09 Sep - 16 Sep	United
12 Sep - 19 Sep	United
06 Sep - 13 Sep	United
15 Sep - 22 Sep	United
26 Sep - 03 Oct	United
18 Sep - 25 Sep	United
21 Sep - 28 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 $573

Return flights