Dong Hoi Airport is an airport in Dong Hoi City in Quang Binh Province , in central Vietnam . It lies 500 km south of Hanoi . Dong Hoi Airport is an airport located in Loc Ninh commune , 6 km north of Dong Hoi city , capital of Quang Binh province , in North Central Coast of Vietnam , 500 km South-east of Hanoi by road .