AirHint found the following cheapest return flights from Bangkok (DMK) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 01 Dec - 07 Dec | Thai Lion Air | ||
| 17 Dec - 24 Dec | Thai AirAsia | ||
| 07 Dec - 14 Dec | AirAsia | ||
| 20 Dec - 03 Jan | Thai AirAsia X |
Also check the deals for one-way flights from Bangkok to Lisbon in December.
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