AirHelp is an online service that helps airline passengers seek compensation for flight cancellations, delays, or overbookings.
In their recent ranking of the Worlds Best Airline
Indigo was ranked as one of the worst airline in the world
At No.103 out of 109.
AirIndia had a slight better score than indigo which was ranked at No.61.
To check the Entire List you can visit
https://www.airhelp.com/en-int/airhelp-score/?score-type=airlines