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

Return flights

14 Sep - 22 Sep	TAP
08 Sep - 17 Sep	TAP
21 Sep - 30 Sep	United
30 Sep - 08 Oct	Air Canada
28 Sep - 08 Oct	United
22 Sep - 29 Sep	SWISS
24 Sep - 29 Sep	SWISS
10 Sep - 16 Sep	United
01 Sep - 10 Sep	Air Canada
22 Sep - 30 Sep	United
09 Sep - 11 Sep	Air Canada
22 Sep - 01 Oct	Austrian Airlines
08 Sep - 19 Sep	TAP
23 Sep - 02 Oct	SWISS
23 Sep - 09 Oct	SWISS
22 Sep - 09 Oct	SWISS
22 Sep - 08 Oct	SWISS
26 Sep - 03 Oct	United
26 Sep - 14 Oct	Air Canada
21 Sep - 25 Oct	Icelandair

Also check the deals for one-way flights from Newark to Barcelona 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 Barcelona in September from 285€

Return flights