AirHint found the following cheapest return flights from Boston (BOS) to Lisbon (LIS) in January 2026 (see full year).

Return flights

29 Jan - 05 Feb	Iberia For Level
31 Jan - 07 Feb	Iberia For Level
27 Jan - 03 Feb	Iberia For Level
26 Jan - 02 Feb	Iberia For Level
05 Jan - 12 Jan	Iberia For Level
25 Jan - 01 Feb	Iberia For Level
28 Jan - 04 Feb	Azores Airlines
30 Jan - 06 Feb	Azores Airlines
21 Jan - 28 Jan	TAP	direct
31 Jan - 07 Feb	TAP	direct
25 Jan - 01 Feb	TAP	direct
28 Jan - 04 Feb	TAP	direct
01 Jan - 08 Jan	United
11 Jan - 18 Jan	United
11 Jan - 18 Jan	TAP	direct
05 Jan - 12 Jan	TAP	direct
01 Jan - 08 Jan	TAP	direct

Also check the deals for one-way flights from Boston to Lisbon in January.

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 Boston to Lisbon in January from $380

Return flights