The ideal timing to book your flight depends on the airline you select, as each airline has a specific schedule. For instance, if you plan to make bookings for Lufthansa booking, it is best to make your reservations before about four to 6 weeks. However, they offer last-minute flight options, along with an incredibly low increase in the cost of airfare. However, the ideal timing to book can be different if you plan to travel with a different airline.