AirHint found the following cheapest return flights from New York (JFK) to Warsaw (WAW) in September 2025 (see full year).

Return flights

14 Sep - 24 Sep	Finnair
01 Sep - 11 Sep	Finnair
05 Sep - 12 Sep	Austrian Airlines
03 Sep - 19 Sep	Finnair
07 Sep - 23 Sep	Finnair
08 Sep - 24 Sep	Finnair
09 Sep - 25 Sep	SWISS
22 Sep - 01 Oct	Finnair
24 Sep - 01 Oct	Finnair
16 Sep - 30 Sep	Finnair
22 Sep - 30 Sep	Finnair
11 Sep - 18 Sep	SWISS
22 Sep - 02 Oct	Finnair
30 Sep - 16 Oct	Finnair
17 Sep - 01 Oct	Finnair
14 Sep - 09 Oct	SWISS
14 Sep - 08 Oct	SWISS
15 Sep - 07 Oct	Lufthansa
02 Sep - 16 Oct	SWISS
28 Sep - 10 Oct	SWISS

Also check the deals for one-way flights from New York 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 New York to Warsaw in September from 332€

Return flights