Cheapest return flights from Boston to Porto in September from $422

Best time to book flights for Boston (BOS) to Porto (OPO) flights at AirHint

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

Return flights

30 Sep - 14 Oct British Airways
10 Sep - 18 Sep Iberia
15 Sep - 22 Sep Iberia
29 Sep - 13 Oct British Airways
25 Sep - 17 Oct British Airways
30 Sep - 07 Oct British Airways
11 Sep - 18 Sep Iberia
12 Sep - 19 Sep Iberia
28 Sep - 05 Oct British Airways
28 Sep - 05 Oct TAP direct
06 Sep - 13 Sep Iberia
13 Sep - 20 Sep Iberia
22 Sep - 27 Sep SWISS
22 Sep - 27 Sep TAP direct

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

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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