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

Return flights

29 Sep - 08 Oct	Air Canada
29 Sep - 09 Oct	Air Canada
22 Sep - 03 Oct	Air Canada
23 Sep - 01 Oct	United
28 Sep - 03 Oct	Air Canada
28 Sep - 08 Oct	Air Canada
22 Sep - 06 Oct	Air Canada
29 Sep - 06 Oct	Aer Lingus
24 Sep - 01 Oct	United
27 Sep - 06 Oct	Aer Lingus
21 Sep - 30 Sep	British Airways
24 Sep - 29 Sep	British Airways
17 Sep - 25 Sep	Scandinavian Airlines
17 Sep - 24 Sep	Aer Lingus
16 Sep - 23 Sep	Aer Lingus
09 Sep - 16 Sep	Lufthansa
17 Sep - 26 Sep	Scandinavian Airlines
10 Sep - 22 Sep	Lufthansa
08 Sep - 16 Sep	Lufthansa
08 Sep - 12 Sep	Air Canada

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 $336

Return flights