- Cauayan Airport, also known as Cauayan Domestic Airport, is a small airport located in the municipality of Cauayan in the province of Isabela, Philippines. It is classified as a community airport by the Civil Aviation Authority of the Philippines and primarily serves the Cagayan Valley region. The airport has a single runway and operates domestic flights to and from Manila, operated by Philippine Airlines. It is approximately a 1.5 to 2-hour drive from the city of Santiago and about a 4-hour drive from Tuguegarao City.