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

Return flights

04 Sep - 11 Sep	Finnair
08 Sep - 30 Sep	Finnair
02 Sep - 17 Sep	Finnair
04 Sep - 17 Sep	Finnair
04 Sep - 12 Sep	Finnair
08 Sep - 16 Sep	Finnair
13 Sep - 25 Sep	Finnair
05 Sep - 25 Sep	Finnair
10 Sep - 22 Sep	SWISS
01 Sep - 10 Sep	SWISS
28 Sep - 07 Oct	TAP
23 Sep - 09 Oct	TAP
15 Sep - 01 Oct	Finnair
03 Sep - 03 Oct	SWISS
15 Sep - 20 Oct	Scandinavian Airlines
03 Sep - 03 Oct	LOT	direct
03 Sep - 08 Oct	LOT	direct
18 Sep - 02 Oct	Finnair
28 Sep - 07 Oct	LOT	direct
15 Sep - 01 Oct	LOT	direct

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 331€

Return flights