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

Return flights

11 Aug - 19 Aug	TAP
26 Aug - 05 Sep	Scandinavian Airlines
12 Aug - 19 Aug	TAP
04 Aug - 28 Aug	TAP
22 Aug - 28 Aug	Air Canada
11 Aug - 20 Aug	TAP
12 Aug - 20 Aug	TAP
10 Aug - 20 Aug	Air Canada
07 Aug - 21 Aug	TAP
10 Aug - 19 Aug	TAP
11 Aug - 21 Aug	TAP
17 Aug - 07 Sep	TAP
14 Aug - 12 Sep	TAP
26 Aug - 05 Sep	United	direct
14 Aug - 12 Sep	United	direct
29 Aug - 01 Sep	Air Canada
18 Aug - 03 Sep	SWISS
29 Aug - 07 Sep	United	direct
14 Aug - 01 Sep	United
17 Aug - 07 Sep	TAP	direct

Also check the deals for one-way flights from Newark to Porto in August.

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.

Book a cheap hotel in Porto

Cheap car rent in Porto

Cheapest return flights from Newark to Porto in August from $481

Return flights