Air India Limited and Druk Air fly from Howrah to Kathmandu 6 times a week. Alternatively, RedBus operates a bus from Howrah to Kathmandu 4 times a day. Tickets cost $9 - $13 and the journey takes 12 h. Nepal Tourist Bus also services this route twice daily.
From Howrah taxi to Kolkata airport, fly to Bagdogra airport, then drive to Dharān Bāzār. 3 h 13 min $80. From Howrah taxi to Kolkata airport, fly to Kathmandu airport, then drive to Kathmandu. 1 h 46 min $167. From Howrah Junction (HWH) train to Raxual Junction (RXL) then drive to Kathmandu. 19 h 4 min $38. From Kolkata bus to Siliguri, drive to Kakadvitta, Hamro Deluxe to Kathmandu, Gaushala, then drive to Kathmandu. 25 h 30 min $29. From Howrah drive to Kathmandu. 12 h 55 min $107.