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

Return flights

12 Dec - 13 Jan	Scandinavian Airlines
12 Dec - 13 Jan	TAP	direct
24 Dec - 08 Jan	TAP	direct
19 Dec - 17 Jan	Delta
20 Dec - 17 Jan	Delta
25 Dec - 14 Jan	TAP	direct
27 Dec - 12 Jan	TAP	direct
25 Dec - 31 Dec	TAP	direct
10 Dec - 14 Dec	Iberia
26 Dec - 30 Dec	Lufthansa
26 Dec - 02 Jan	Lufthansa
18 Dec - 03 Jan	Lufthansa
11 Dec - 14 Dec	Iberia
02 Dec - 09 Dec	SWISS
13 Dec - 03 Jan	United
06 Dec - 12 Dec	KLM
15 Dec - 28 Dec	KLM
10 Dec - 14 Dec	Virgin Atlantic	direct
11 Dec - 14 Dec	Virgin Atlantic	direct
06 Dec - 12 Dec	Virgin Atlantic	direct

Also check the deals for one-way flights from Lisbon 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.

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Cheapest return flights from Lisbon to Boston in December from $520

Return flights