Mumbai is 11.5 hours ahead of Austin during US summer (CDT), and 10.5 hours ahead during winter (CST). When it's 9:00 AM in Austin, it's 8:30 PM or 9:30 PM in Mumbai.
India uses IST (UTC+5:30) year-round and doesn't observe DST.
Optimal window: 7:00 AM - 9:00 AM Austin time (6:30 PM - 8:30 PM Mumbai). Early morning calls from Austin catch evening hours in Mumbai.
Air India and connecting flights link Austin to Mumbai Chhatrapati Shivaji International Airport.