AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 09 Dec - 24 Dec | United | ||
| 16 Dec - 23 Dec | KLM | ||
| 31 Dec - 07 Jan | British Airways | ||
| 16 Dec - 10 Jan | Air France | ||
| 10 Dec - 28 Dec | Frontier Airlines | ||
| 23 Dec - 30 Dec | Turkish Airlines | ||
| 25 Dec - 01 Jan | Lufthansa |
Also check the deals for one-way flights from Denver to Lisbon in December.
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