There's a direct bus from Kashmere Gate to Sangla. It leaves at 8 PM. You can book it through the HRTC app. But what is suggested is you break your journey since Delhi to Sangla is close to 18 hrs. Delhi to Rampur - HRTC Volvo Rampur to Sangla - Regular HRTC (Only Option) If you do not get a direct bus from Rampur, catch any bus going towards Recongpeo. Get down at Karcham and take a shared cab or another bus (which are at considerable intervals).