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

Return flights

14 Sep - 28 Sep	LEVEL
14 Sep - 28 Sep	TAP	direct
10 Sep - 17 Sep	TAP	direct
24 Sep - 27 Sep	TAP	direct
20 Sep - 29 Sep	TAP	direct
21 Sep - 29 Sep	TAP	direct
17 Sep - 22 Sep	TAP	direct
24 Sep - 11 Oct	TAP	direct
24 Sep - 12 Oct	TAP	direct
24 Sep - 13 Oct	TAP	direct
28 Sep - 18 Oct	TAP	direct
25 Sep - 27 Sep	TAP
20 Sep - 30 Sep	TAP
20 Sep - 01 Oct	TAP
21 Sep - 01 Oct	TAP
27 Sep - 29 Sep	TAP	direct

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

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 September from 365€

Return flights