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

Return flights

28 Sep - 09 Oct	TAP
02 Sep - 16 Sep	Air Canada
08 Sep - 16 Sep	TAP
22 Sep - 30 Sep	TAP
23 Sep - 30 Sep	TAP
30 Sep - 13 Oct	TAP
28 Sep - 13 Oct	TAP
04 Sep - 12 Sep	Air Canada
28 Sep - 06 Oct	TAP
22 Sep - 29 Sep	TAP
23 Sep - 29 Sep	TAP
22 Sep - 09 Oct	TAP
07 Sep - 23 Sep	SWISS
01 Sep - 10 Sep	SWISS
04 Sep - 16 Sep	Air Canada
24 Sep - 10 Oct	TAP
29 Sep - 11 Oct	TAP
17 Sep - 07 Oct	TAP
18 Sep - 07 Oct	TAP
15 Sep - 07 Oct	SWISS

Also check the deals for one-way flights from Newark 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 Newark to Warsaw in September from $387

Return flights