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

Return flights

30 Jun - 10 Jul	KLM
30 Jun - 07 Jul	KLM
29 Jun - 05 Jul	Delta
27 Jun - 08 Jul	Delta
27 Jun - 11 Jul	Delta
27 Jun - 07 Jul	TAP
27 Jun - 02 Jul	United	direct
30 Jun - 10 Jul	United	direct
27 Jun - 07 Jul	United	direct
29 Jun - 05 Jul	United	direct
27 Jun - 29 Jun	United	direct
27 Jun - 30 Jun	Delta
27 Jun - 30 Jun	United	direct
27 Jun - 28 Jun	United	direct
28 Jun - 30 Jun	easyJet
28 Jun - 30 Jun	United	direct

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

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 June from $663

Return flights