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

Return flights

23 Dec - 13 Jan	British Airways
23 Dec - 01 Jan	British Airways
23 Dec - 30 Dec	British Airways
04 Dec - 11 Dec	British Airways
04 Dec - 10 Dec	British Airways
12 Dec - 02 Jan	Iberia
24 Dec - 02 Jan	Iberia
23 Dec - 02 Jan	British Airways
26 Dec - 01 Jan	Lufthansa
27 Dec - 01 Jan	Lufthansa
26 Dec - 04 Jan	Lufthansa
13 Dec - 03 Jan	SWISS
26 Dec - 01 Jan	TAP	direct
04 Dec - 10 Dec	Virgin Atlantic	direct
04 Dec - 11 Dec	Virgin Atlantic	direct
05 Dec - 13 Dec	Delta
03 Dec - 09 Dec	Air France
03 Dec - 08 Dec	Air France
03 Dec - 10 Dec	Delta
03 Dec - 07 Dec	Air France

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 449€

Return flights