AirHint found the following cheapest return flights from Chiang Mai (CNX) to Colombo (CMB) in December 2025 (see full year).
Return flights
| 11 Dec - 17 Dec | Thai Lion Air | ||
| 04 Dec - 07 Dec | Thai Lion Air | ||
| 19 Dec - 05 Jan | Thai Lion Air | ||
| 01 Dec - 15 Dec | Thai AirAsia |
Also check the deals for one-way flights from Chiang Mai to Colombo in December.
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