There are a number of languages spoken in Darjeeling including Nepali and Bengali. English is also one of the most common languages spoken in the town. If you choose any Darjeeling packages by Thrillophilia, you will have the added advantage of a companion with you who can converse for you with the locals there.
However, if you are on your own you can speak to the localities in English and they will be able to reply. You can also speak in Hindi at some places in the city. Although the Hindi language is not common here, many vendors in the main city can converse in it.
Also Checkout: Darjeeling Tour Packages From Surat