Request a quote for car rental at Chiang Mai Intl Airport, CNX. Chiang Mai International Airport is the second largest in Thailand handling around 3,000,000 passengers a year from around the world. The easiest way to travel is by rental car with Sixt. Arrange a rental car agreement online in advance or at the counter in the airport which can be found in the downstairs arrival hall. Friendly rental car staff can organize everything on your behalf which can include LDW, additional drivers, unlimited mileage, and special discounts. Renting a car at Chiang Mai Intl Airport is the ideal way to begin your vacation.