Vistara launches 24-hour flash sale with up to 75 per cent discount on fares Industry-Economic Times — September 18, 2018 comments off “Bookings under the sale are open for 24 hours only, starting 0001 hours on Wednesday, September 19, 2018, and ending at 2359 hours for travel between September 27, 2018 and April 10, 2019,” the airline said in a statement.