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

Return flights

11 Dec - 15 Dec	Aer Lingus
08 Dec - 15 Dec	Aer Lingus
03 Dec - 06 Dec	Ryanair
16 Dec - 13 Jan	TAP	direct
24 Dec - 08 Jan	Vueling Airlines
05 Dec - 09 Dec	KLM
21 Dec - 10 Jan	Air France
23 Dec - 31 Dec	Lufthansa
13 Dec - 17 Dec	Air France
08 Dec - 15 Dec	Virgin Atlantic	direct
22 Dec - 30 Dec	Lufthansa
26 Dec - 31 Dec	TAP	direct
29 Dec - 04 Jan	Lufthansa
26 Dec - 01 Jan	TAP	direct
25 Dec - 01 Jan	TAP	direct
23 Dec - 30 Dec	Lufthansa
19 Dec - 04 Jan	Lufthansa
13 Dec - 03 Jan	Lufthansa
27 Dec - 02 Jan	Lufthansa
20 Dec - 05 Jan	United

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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from Lisbon to Boston in December from $569

Return flights