AirHint found the following cheapest one-way flights from Boston (BOS) to Lisbon (LIS) in December 2025 (see full year).
One-Way flights
| 10 Dec | Virgin Atlantic | ||
| 08 Dec | SWISS | ||
| 06 Dec | Icelandair | ||
| 01 Dec | Lufthansa | ||
| 31 Dec | Icelandair | ||
| 03 Dec | Icelandair | ||
| 30 Dec | LEVEL | ||
| 07 Dec | TAP | direct | |
| 05 Dec | Icelandair | ||
| 01 Dec | TAP | direct |
Also check the deals for return flights from Boston to Lisbon in December.
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