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

Return flights

10 Dec - 16 Dec	Vueling Airlines
08 Dec - 16 Dec	Vueling Airlines
07 Dec - 14 Dec	Vueling Airlines
01 Dec - 14 Dec	Iberia
09 Dec - 16 Dec	Iberia
21 Dec - 03 Jan	Iberia
19 Dec - 23 Dec	KLM
11 Dec - 17 Dec	Vueling Airlines
12 Dec - 19 Dec	Vueling Airlines
12 Dec - 17 Dec	Vueling Airlines
13 Dec - 17 Dec	Vueling Airlines
31 Dec - 01 Jan	Iberia

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

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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from Porto to Boston in December from $478

Return flights