Patilar is located in West Champaran District of Bihar. It is 42 km north-west of Bettiah. Patilar is perched at an altitude of 223 ft above sea level and lies on the eastern bank of Gantak River. The town is prone to flood during the monsoons.
Patna Airport and Varanasi Airport are the closest airports. Patilar is served by Bagaha Railway Station and is 15 km south of Bagaha.