AirHint found the following cheapest return flights from Newark (EWR) to Madrid (MAD) in September 2026 (see full year).

Return flights

23 Sep - 07 Oct	United
01 Sep - 09 Sep	Air Canada
16 Sep - 22 Sep	Air Canada
19 Sep - 28 Sep	Air Canada
01 Sep - 10 Sep	Iberia	direct
17 Sep - 21 Sep	Air Canada
10 Sep - 22 Sep	SWISS
16 Sep - 22 Sep	Finnair	direct
23 Sep - 07 Oct	British Airways	direct
10 Sep - 22 Sep	British Airways	direct
03 Sep - 20 Sep	Air Canada
01 Sep - 09 Sep	Finnair	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 $364

Return flights