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

Return flights

30 Sep - 22 Oct	Condor
03 Sep - 10 Sep	United
09 Sep - 16 Sep	United
20 Sep - 28 Sep	Hawaiian Airlines
11 Sep - 18 Sep	United
01 Sep - 08 Sep	United
24 Sep - 01 Oct	United
30 Sep - 07 Oct	United
17 Sep - 24 Sep	United
03 Sep - 05 Sep	Hawaiian Airlines
13 Sep - 20 Sep	United
15 Sep - 22 Sep	United
05 Sep - 12 Sep	United
27 Sep - 04 Oct	United

Also check the deals for one-way flights from San Francisco to Warsaw 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 Warsaw in September from 477€

Return flights