The nearest airport from Keylong is the Kullu-Manali Airport Himachal Pradesh.
The minimum time a bus takes to reach Keylong from New Delhi is 16h 30m. The cheapest way to reach Keylong from New Delhi takes you 16h 44m, which is to take train with train number 04070 from New Delhi to Ambala Cantt then take State Transport Bus from Ambala Cantt to Keylong.
The closest Railway station is Chandigarh. From Chandigarh, you can reach Lahaul via Manali and Spiti via Shimla by road. The journey by road would be an approximate of 5 and 9 hours respectively. Alternatively, one can also reach Shimla by train and then take a cab for the onward journey.