Ans. Here are the things you need to know about booking tickets online: You can book up to 6 hours before the scheduled departure of the flight, in case of international destinations.  In case you are travelling within metropolitan France and Europe, you can book up to an hour before the flight's scheduled departure.  The deadline is different for certain destinations like the deadline is Twenty-four hours to and from North Africa, three days to and from South America, other African locations, and Brazil.