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

Return flights

16 Sep - 24 Sep	SWISS
16 Sep - 23 Sep	SWISS
30 Sep - 07 Oct	Lufthansa
15 Sep - 22 Sep	SWISS
18 Sep - 25 Sep	SWISS
14 Sep - 21 Sep	Lufthansa
09 Sep - 16 Sep	SWISS
24 Sep - 18 Oct	British Airways
23 Sep - 30 Sep	SWISS
20 Sep - 19 Oct	United
10 Sep - 17 Sep	Lufthansa
12 Sep - 19 Sep	Austrian Airlines
11 Sep - 18 Sep	Lufthansa
25 Sep - 02 Oct	Lufthansa
29 Sep - 06 Oct	Lufthansa
10 Sep - 04 Oct	Austrian Airlines
25 Sep - 05 Oct	TAP
19 Sep - 11 Oct	Turkish Airlines
18 Sep - 11 Oct	United
27 Sep - 04 Oct	Lufthansa

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 463€

Return flights