AirHint found the following cheapest return flights from Newark (EWR) to Porto (OPO) in May 2026 (see full year).

Return flights

20 May - 01 Jun	Aer Lingus
11 May - 26 May	Iberia
05 May - 12 May	Iberia
12 May - 19 May	Iberia
06 May - 11 May	Scandinavian Airlines
13 May - 20 May	Iberia
16 May - 25 May	Scandinavian Airlines
09 May - 11 May	Scandinavian Airlines
26 May - 09 Jun	Iberia
22 May - 02 Jun	FrenchBee
16 May - 23 May	FrenchBee
15 May - 24 May	FrenchBee
09 May - 16 May	Finnair
26 May - 09 Jun	TAP	direct
28 May - 06 Jun	Lufthansa
28 May - 06 Jun	Lufthansa	direct
20 May - 01 Jun	TAP	direct
22 May - 02 Jun	Lufthansa	direct

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

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 Newark to Porto in May from $626

Return flights