Low-cost carrier Thai AirAsia will suspend its thrice weekly Bangkok-Colombo service on 10 October.
The airline also suspended its thrice weekly service from Phuket to Ubon Ratchathani and four times weekly service from Phuket to Denpasar on 30 September.
Thai AirAsia's spokeswoman did not state a reason for the service suspensions.
Prior to the suspensions, the airline competed with carriers such as Thai Airways on the Bangkok-Colombo route and was the sole operator on the Phuket-Denpasar route.
The carrier's sole aircraft type is the Airbus A320.