AirHint found the following cheapest one-way flights from Houston (HOU) to Lisbon (LIS) in December 2025 (see full year).
One-Way flights
| 11 Dec | Spirit Airlines | ||
| 14 Dec | Spirit Airlines | ||
| 16 Dec | Spirit Airlines | ||
| 15 Dec | Spirit Airlines | ||
| 17 Dec | Spirit Airlines | ||
| 27 Dec | United | ||
| 26 Dec | United |
Also check the deals for return flights from Houston to Lisbon in December.
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