From Batanagar Nangi ferry ghat take Hirapur ferry and reach there within 10 min. From Hirapur to Nalpur station just 7 min via Toto. Nalpur to Ulubaria station by local train took only 10 min. Take the express train for Digha from Ulubaria station.
Cost Rs. 25 per person you can reach Ulubaria from South Kolkata Batanagar.
Time taken 27 min only