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

Return flights

26 Aug - 10 Sep	Fly Play
27 Aug - 10 Sep	Lufthansa
24 Aug - 08 Sep	KLM
09 Aug - 01 Sep	Azores Airlines
02 Aug - 04 Aug	Fly Play
03 Aug - 01 Sep	TAP
03 Aug - 03 Sep	TAP
04 Aug - 11 Aug	TAP	direct
02 Aug - 09 Aug	TAP	direct
24 Aug - 08 Sep	TAP	direct
13 Aug - 27 Aug	TAP
13 Aug - 20 Aug	TAP
02 Aug - 02 Sep	TAP
24 Aug - 27 Aug	TAP	direct
12 Aug - 19 Aug	TAP
12 Aug - 26 Aug	TAP
07 Aug - 28 Aug	Lufthansa
16 Aug - 18 Aug	Fly Play
12 Aug - 02 Sep	TAP
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 394€

Return flights