IndiGo is the first choice of millions of air passengers in India, and for good reason. In fact, it boasts of a market share of over thirty percent as of 2013, making it the largest airline in India. Also, it is one of the fastest-growing low-cost carriers in the world, offering more than four hundred flights every day to thirty five destinations, and counting. More importantly, it gives out discounts to all customers who book online with an IndiGo Airlines promo code.
Gives 200INR discount on Indigo mobile app, multiple times. However mobile app doesn't work with non-Indian credit cards so choose "pay later" and pay on their normal website (discount still holds but credit card fee 150INR is added)