AirHint found the following cheapest return flights from Kathmandu (KTM) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 04 Dec - 08 Dec | IndiGo | ||
| 21 Dec - 28 Dec | Air Arabia | ||
| 30 Dec - 06 Jan | Air India | ||
| 15 Dec - 22 Dec | Turkish Airlines |
Also check the deals for one-way flights from Kathmandu to Lisbon in December.
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