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

Return flights

30 Sep - 04 Oct	Transavia France
24 Sep - 29 Sep	Transavia France
24 Sep - 28 Sep	easyJet
25 Sep - 28 Sep	Transavia France
26 Sep - 29 Sep	Transavia France
17 Sep - 24 Sep	Transavia France
09 Sep - 21 Sep	Transavia France
11 Sep - 21 Sep	Transavia France
13 Sep - 20 Sep	Transavia France
13 Sep - 14 Sep	Transavia France
18 Sep - 24 Sep	Transavia France
28 Sep - 04 Oct	Transavia France
19 Sep - 09 Oct	SWISS
28 Sep - 05 Oct	Transavia France
23 Sep - 07 Oct	TAP
25 Sep - 07 Oct	SWISS
30 Sep - 31 Oct	SWISS
19 Sep - 05 Oct	United	direct
19 Sep - 03 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 360€

Return flights