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

Return flights

27 Sep - 01 Oct	easyJet
19 Sep - 21 Sep	easyJet
10 Sep - 15 Sep	easyJet
09 Sep - 15 Sep	Transavia France
08 Sep - 15 Sep	Transavia France
21 Sep - 30 Sep	Vueling Airlines
09 Sep - 16 Sep	SWISS
09 Sep - 14 Sep	SWISS
19 Sep - 26 Sep	SWISS
22 Sep - 30 Sep	TAP
17 Sep - 23 Sep	United
29 Sep - 06 Oct	SWISS
23 Sep - 01 Oct	SWISS
26 Sep - 05 Oct	SWISS
19 Sep - 05 Oct	United	direct
26 Sep - 02 Oct	TAP

Also check the deals for one-way flights from Porto to Newark 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 Porto to Newark in September from $435

Return flights