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

Return flights

26 Sep - 28 Sep	Delta
26 Sep - 03 Oct	Delta
30 Sep - 05 Oct	SWISS
25 Sep - 29 Sep	Transavia France
25 Sep - 04 Oct	Air France
24 Sep - 27 Sep	United	direct
25 Sep - 29 Sep	United	direct
25 Sep - 30 Sep	United	direct
25 Sep - 04 Oct	United	direct
24 Sep - 28 Sep	United	direct
24 Sep - 30 Sep	United	direct
24 Sep - 01 Oct	United
25 Sep - 01 Oct	United
26 Sep - 28 Sep	United	direct
26 Sep - 30 Sep	Lufthansa
26 Sep - 03 Oct	United	direct
27 Sep - 18 Oct	TAP
27 Sep - 03 Oct	Transavia France
26 Sep - 01 Oct	Lufthansa
24 Sep - 26 Sep	United

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 521€

Return flights