It appears that Chennai airport has suspended operations due to flooding thanks to almost one month of incessant and unseasonal rains.
India’s largest domestic airline, IndiGo, released a statement
This is to notify IndiGo passengers and the local partners in Chennai – that due to severe weather conditions, Chennai airport is shut for operations. Keeping in mind the safety of our passengers, crew and ground staff – all flights operating out of Chennai stands cancelled for tonight and tomorrow morning. IndiGo passengers are requested to check status against their respective booking via IndiGo’s social media channels including Twitter @IndiGo6E and Facebook https://m.facebook.com/goindigo.in/
IndiGo assures all passengers will receive 100 per cent refund against the flight cancellations made on grounds of weather conditions, and cancellation and change fee will be waived off for affected passengers till further notice.
All employees have been accommodated at safe locations.