AirHint found the following cheapest one-way flights from Keflavik (KEF) to Lisbon (LIS) in December 2025 (see full year).
One-Way flights
| 02 Dec | easyJet | ||
| 08 Dec | easyJet | ||
| 12 Dec | Wizz Air Malta | ||
| 01 Dec | easyJet | ||
| 01 Dec | Fly Play | direct | |
| 12 Dec | Fly Play | direct | |
| 19 Dec | easyJet | ||
| 19 Dec | Fly Play | direct | |
| 22 Dec | easyJet | ||
| 23 Dec | easyJet |
Also check the deals for return flights from Keflavik to Lisbon in December.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
Find us on social media