When flights in the future are not filled as well as the airlines had initially forecasted, they often lower the prices thus making spur-of-the-moment travel cheaper. You could take advantage of these opportunities by using digital platforms to make faster flight reservations/booking. The Last minute trip deals to anywhere seem to be the offers made during the midweek or off-peak. Other carriers too provide restricted upgrade chances on the seats or provide the option to reserve remaining seats to small groups when re-calibrating their route programs. https://askforairlines.com/blog/last-minute-trip-deals-to-anywhere/