Udon Thani International Airport — Udon Thani, Thailand

Udon Thani International Airport, known by the code UTH, serves the city of Udon Thani in Thailand's northeastern Isan region, an area historically tied to Lao culture and language near the Mekong basin. Built originally as a joint military-civilian facility used by the United States Air Force during the Vietnam War era, the airport retains a long runway that speaks to that history while now functioning mainly as a civilian gateway for domestic and limited international traffic. UTH connects Udon Thani with Bangkok on frequent daily flights and provides a convenient entry point for travelers heading onward to Vientiane, the capital of Laos, a short drive across the border. The surrounding province is known for rice farming and archaeological sites, and the airport has become an important link for regional commerce and cross-border travel between Thailand and Laos.