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

Return flights

17 Sep - 21 Sep	Scandinavian Airlines
24 Sep - 28 Sep	Scandinavian Airlines
11 Sep - 16 Sep	Lufthansa
24 Sep - 30 Sep	SWISS
10 Sep - 15 Sep	SWISS
10 Sep - 22 Sep	SWISS
09 Sep - 16 Sep	Lufthansa	direct
24 Sep - 30 Sep	United	direct
09 Sep - 21 Sep	United	direct
15 Sep - 21 Sep	Lufthansa	direct
21 Sep - 07 Oct	Lufthansa	direct
19 Sep - 07 Oct	Brussels Airlines	direct
19 Sep - 05 Oct	United	direct
26 Sep - 06 Oct	SWISS
19 Sep - 03 Oct	United
19 Sep - 09 Oct	United
26 Sep - 03 Oct	SWISS
27 Sep - 04 Oct	Ryanair
16 Sep - 02 Oct	United
25 Sep - 02 Oct	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 366€

Return flights