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

Return flights

09 Sep - 16 Sep	SWISS
28 Sep - 21 Oct	SWISS
28 Sep - 20 Oct	SWISS
10 Sep - 24 Sep	United
10 Sep - 17 Sep	United
15 Sep - 15 Oct	SWISS
15 Sep - 23 Sep	SWISS
15 Sep - 07 Oct	SWISS
29 Sep - 16 Oct	Scandinavian Airlines
29 Sep - 13 Oct	SWISS
15 Sep - 24 Sep	United
30 Sep - 07 Oct	Lufthansa
24 Sep - 01 Oct	United
20 Sep - 11 Oct	Scandinavian Airlines
25 Sep - 07 Oct	Scandinavian Airlines
11 Sep - 18 Sep	United
11 Sep - 23 Sep	United
11 Sep - 24 Sep	United
19 Sep - 24 Sep	Scandinavian Airlines
18 Sep - 25 Sep	United

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 375€

Return flights