Aviation IndiGo to take on Vistara on Delhi-Singapore route from September 12 Updated : August 23, 2019 01:48 PM IST The route of Delhi-Singapore will now be served by four airlines, namely Singapore Airlines, Air India, Vistara and IndiGo. The move from the low-cost carrier comes two weeks after Vistara launched flights to Singapore from Delhi and Mumbai. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.