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

Return flights

21 Sep - 16 Oct	SWISS
21 Sep - 01 Oct	United
22 Sep - 01 Oct	United
23 Sep - 30 Sep	United
21 Sep - 30 Sep	SWISS
22 Sep - 26 Sep	Air Canada
21 Sep - 24 Sep	SWISS
20 Sep - 24 Sep	British Airways
30 Sep - 14 Oct	Air Canada
21 Sep - 23 Sep	United
30 Sep - 16 Oct	Lufthansa
24 Sep - 30 Sep	Lufthansa
25 Sep - 30 Sep	Air Canada
29 Sep - 02 Oct	Air Canada
16 Sep - 14 Oct	Air Canada
15 Sep - 26 Sep	Air Canada
16 Sep - 26 Sep	Air Canada
21 Sep - 11 Oct	United
30 Sep - 06 Oct	Air Canada
20 Sep - 01 Oct	United

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 $356

Return flights