AirHint found the following cheapest return flights from Nashville (BNA) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 31 Dec - 12 Jan | Air Canada | ||
| 31 Dec - 10 Jan | Delta | ||
| 31 Dec - 11 Jan | Delta | ||
| 04 Dec - 08 Dec | United | ||
| 30 Dec - 09 Jan | United | ||
| 13 Dec - 19 Dec | Spirit Airlines |
Also check the deals for one-way flights from Nashville to Lisbon in December.
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