By plane
Bhairahawa's airport IATA: BWA, ICAO: VNBW is one of Nepal's busiest. The official name is Gautam Buddha Airport. Flights from Kathmandu take 45 minutes and cost about $200 for foreigners or $115 for nationals. 160 NRs airport tax applies to all domestic flights. Carriers include Buddha Air and Yeti Air.
By train
From Delhi to Gorakhpur. A broad gauge track goes to Nautanwa from Gorakhpur but trains are infrequent so travelers may prefer to hire a taxi directly to Sunauli, taking about two hours. Or from Nautanwa take a taxi, bus or rickshaw to Sunauli about 5 kilometers. Cross the border to Belahiya, Nepal and immigration formalities. Then take a bus, taxi or rickshaw on to Bhairahawa 3 km.. Total time approximately 12 - 18 hours.
From Kolkata Calcutta via Patna and Gorakhpur, and from Gorakhpur as from Dehli, above. Total time approximately 10 - 12 hours.
By bus
From Dehli via Gorakhpur and Sunauli Be sure to review warnings about scams at Sunauli border crossing. 24 - 30 hours.
From Kathmandu via Bharatpur -- also called Narayangarh or Narayanghat -- and Butwal. 7 - 10 hours.
From Pokhara via Tansen and Butwal potholed, windy road, but beautiful views 5 - 6 hours. Also via Bharatpur and Butwal better road conditions. 5 -6 hours.
From Sauraha Chitwan Jungle Take local bus or jeep to Tadi Bazaar then intercity micro-bus/bus via Bharatpur and Butwal. Road is very good. 4-5 hours.