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

Return flights

09 Aug - 11 Aug	Fly Play
06 Aug - 23 Aug	TAP	direct
24 Aug - 30 Aug	SWISS
12 Aug - 27 Aug	Lufthansa
03 Aug - 09 Aug	TAP	direct
20 Aug - 25 Aug	Lufthansa
08 Aug - 24 Aug	TAP
12 Aug - 02 Sep	United
10 Aug - 24 Aug	TAP	direct
24 Aug - 30 Aug	TAP	direct
08 Aug - 10 Aug	Iberia
15 Aug - 05 Sep	TAP

Also check the deals for one-way flights from Porto to Boston 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 Porto to Boston in August from $686

Return flights