Patna is about 1000 kilometers from Gautam Buddha Nagar. The fastest way is by flight from Delhi Airport, taking about 1.5 hours. You can also take a train from Delhi, which takes about 15-20 hours. Patna is the capital of Bihar.
Total Distance: 1000 km by road, 850 km straight-line.
Book tickets well in advance.
Book in advance for cheaper fares.
October to February for pleasant weather.