AirHint found the following cheapest return flights from Boston (BOS) to Porto (OPO) in August 2026 (see full year).

Return flights

12 Aug - 26 Aug	United
03 Aug - 17 Aug	Iberia
12 Aug - 26 Aug	TAP	direct
01 Aug - 12 Aug	Air Canada
01 Aug - 15 Aug	Air Canada
01 Aug - 10 Aug	Air Canada
03 Aug - 17 Aug	TAP	direct
01 Aug - 10 Aug	TAP	direct
01 Aug - 12 Aug	TAP	direct

Also check the deals for one-way flights from Boston 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.

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Cheapest return flights from Boston to Porto in August from $444

Return flights