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

Return flights

29 Sep - 14 Oct	United
29 Sep - 08 Oct	United
09 Sep - 17 Sep	Air Canada
23 Sep - 07 Oct	United
23 Sep - 30 Sep	United
22 Sep - 30 Sep	United
17 Sep - 24 Sep	United
16 Sep - 26 Sep	United
28 Sep - 09 Oct	SWISS
08 Sep - 16 Sep	Air Canada
28 Sep - 07 Oct	SWISS
16 Sep - 23 Sep	United
21 Sep - 30 Sep	SWISS
06 Sep - 16 Sep	Air Canada
06 Sep - 17 Sep	Air Canada
29 Sep - 01 Oct	United
29 Sep - 31 Oct	Air France
28 Sep - 10 Oct	Delta
27 Sep - 15 Oct	Air Canada
28 Sep - 10 Oct	United	direct

Also check the deals for one-way flights from Newark to Madrid 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 Madrid in September from 307€

Return flights