Departure tax is an airport facility tax that residents and visitors to the island need to pay when departing Curaçao. Some airlines have the departure tax included in their ticket price, so if you fly with any of the following airlines you've already paid it: American Airlines, KLM, TUI fly, Air Canada, WestJet, Copa Airlines, Avianca, and Surinam Airways.
Learn more about the departure tax on the Curaçao Airport website.