Cheapest return flights from Boston to Porto in August from $413

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

Return flights

20 Aug - 27 Aug Lufthansa
21 Aug - 28 Aug United
31 Aug - 20 Sep Air Canada
28 Aug - 20 Sep Lufthansa
27 Aug - 01 Sep British Airways
21 Aug - 24 Aug SWISS
20 Aug - 24 Aug Lufthansa
20 Aug - 27 Aug TAP direct
20 Aug - 24 Aug TAP direct

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

Skyscanner

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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