Flying to Koh Samui is significantly more expensive than other Thai destinations primarily because Bangkok Airways owns and operates the Samui Airport (USM). This private ownership creates a virtual monopoly, as the airline restricts the number of daily flights and slots available to competitors. In 2026, while a few other carriers like Thai Airways have limited access, the lack of low-cost competition keeps fares high. Additionally, the airport is an "open-air" boutique facility with high maintenance costs and strict environmental regulations that limit aircraft size and noise levels. Travelers often find that flying into nearby Surat Thani or Nakhon Si Thammarat and taking a ferry is nearly 60–70% cheaper, though it adds several hours to the journey. For those prioritizing time, the "Samui Tax" remains a standard part of the luxury island experience.