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

Return flights

15 Sep - 15 Oct	United
29 Sep - 10 Oct	SWISS
27 Sep - 07 Oct	SWISS
30 Sep - 10 Oct	SWISS
24 Sep - 02 Oct	United
15 Sep - 23 Sep	United
28 Sep - 30 Oct	SWISS
15 Sep - 25 Sep	United
29 Sep - 07 Oct	Scandinavian Airlines
30 Sep - 07 Oct	British Airways
30 Sep - 30 Oct	SWISS
16 Sep - 23 Sep	United
16 Sep - 25 Sep	United
30 Sep - 28 Oct	SWISS
09 Sep - 16 Sep	SWISS
10 Sep - 18 Sep	United
16 Sep - 24 Sep	United
09 Sep - 18 Sep	United
15 Sep - 22 Sep	SWISS
10 Sep - 17 Sep	United

Also check the deals for one-way flights from Newark to Athens 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 Athens in September from 390€

Return flights