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

Return flights

24 Sep - 30 Sep	Delta
25 Sep - 29 Sep	Air Canada
23 Sep - 28 Sep	United	direct
30 Sep - 11 Oct	Delta
17 Sep - 27 Sep	Air France
23 Sep - 30 Sep	Delta
23 Sep - 29 Sep	Delta
18 Sep - 23 Sep	United
18 Sep - 22 Sep	Air Canada
25 Sep - 30 Sep	Brussels Airlines
19 Sep - 28 Sep	United	direct
19 Sep - 05 Oct	United	direct
23 Sep - 09 Oct	Air Transat
16 Sep - 02 Oct	United	direct
19 Sep - 03 Oct	easyJet
26 Sep - 03 Oct	SWISS
23 Sep - 09 Oct	Brussels Airlines	direct
28 Sep - 22 Oct	Air Transat
29 Sep - 04 Oct	SWISS
29 Sep - 10 Oct	SWISS

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 $508

Return flights