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

Return flights

01 Sep - 16 Sep	SWISS
09 Sep - 23 Sep	SWISS
02 Sep - 30 Sep	SWISS
08 Sep - 16 Sep	SWISS
07 Sep - 23 Sep	Austrian Airlines
11 Sep - 17 Sep	Austrian Airlines
09 Sep - 16 Sep	SWISS
30 Sep - 16 Oct	TAP
08 Sep - 24 Sep	SWISS
02 Sep - 18 Sep	SWISS
10 Sep - 23 Sep	SWISS
16 Sep - 02 Oct	SWISS
14 Sep - 09 Oct	SWISS
14 Sep - 08 Oct	SWISS
23 Sep - 06 Oct	TAP
22 Sep - 02 Oct	TAP
24 Sep - 01 Oct	TAP
28 Sep - 10 Oct	SWISS
15 Sep - 07 Oct	SWISS
17 Sep - 01 Oct	British Airways

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 331€

Return flights