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

Return flights

25 Sep - 02 Oct	TAP
19 Sep - 27 Sep	Air Canada
22 Sep - 25 Sep	United
17 Sep - 24 Sep	Air Canada
30 Sep - 06 Oct	Air Canada
26 Sep - 03 Oct	United
20 Sep - 29 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
18 Sep - 29 Sep	United
25 Sep - 29 Sep	Air Canada
24 Sep - 29 Sep	Air Canada
19 Sep - 29 Sep	Air Canada
22 Sep - 30 Sep	Air Canada
21 Sep - 01 Oct	TAP
25 Sep - 01 Oct	United
25 Sep - 05 Oct	SWISS
19 Sep - 01 Oct	SWISS
01 Sep - 03 Oct	TAP
16 Sep - 06 Oct	SWISS
05 Sep - 07 Oct	SWISS

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 289€

Return flights