Departure tax is included in the price of a ticket.
Maui has a large number of nonstop flights to/from cities on the mainland, including Los Angeles, San Diego, San Francisco, Seattle, Dallas, Chicago and Vancouver, BC. Otherwise it's common to connect through Honolulu.
Kahului International Airport All trans-Pacific flights to Maui arrive in Kahului, the island’s main airport. There's a staffed Visitor Information Desk in the baggage claim area that’s open 7:45am to 10pm daily. There are racks of local travel brochures beside the desk. A huge new rental-car facility and monorail will make the terminal area a construction site through 2019.