Cat Bi International Airport — Haiphong (Hai An), Vietnam

Cat Bi International Airport, known by the code HPH, serves Haiphong, Vietnam's major northern port city and an increasingly important industrial and manufacturing center near Hanoi. A significantly expanded terminal opened in the mid-2010s to accommodate rising passenger numbers, reflecting both Haiphong's economic growth and its usefulness as an alternative gateway to the Ha Long Bay tourist region, which lies within a manageable drive of the airport. Budget carriers have expanded route networks from HPH in recent years, adding domestic connections to Ho Chi Minh City and other Vietnamese cities alongside a growing set of regional international flights. The airport's coastal location places it near shipbuilding and port facilities that have historically defined Haiphong's economy, while newer manufacturing investment has diversified the city's industrial base and increased business travel demand.