The Gorakhpur to Sonauli border is approximately 100km, which is the entry point of Nepal. It takes only 2 to 3 hour to reach Nepal, which is why most of the tourists opt for taxi booking service in Gorakhpur, as it is the most convenient for this journey. https://book-cab.stck.me/post/565382/Seamless-Taxi-Rides-from-Gorakhpur-to-Nepal