IndiGo does not have any frequent flyer program. However, it has a 6E Rewards Program. This program is linked to a co-branded card which is used for purchasing goods and services on Indigo and other merchant stores. The members can earn and redeem the points accuring to the 6E rewards program using this card. The validity of the 6E rewards program is for 12 months from the date of accrual.
The credit cards are of Ka-Ching cobranded with HDFC Bank and Kotak Bank.
There is a joining fee associated with the membership of these cards.