AirHint found the following cheapest return flights from Phoenix (PHX) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 29 Dec - 15 Jan | British Airways | ||
| 13 Dec - 23 Dec | Frontier Airlines | ||
| 24 Dec - 06 Jan | Hawaiian Airlines | ||
| 20 Dec - 10 Jan | WestJet | ||
| 19 Dec - 10 Jan | WestJet | ||
| 19 Dec - 04 Jan | WestJet |
Also check the deals for one-way flights from Phoenix to Lisbon in December.
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