It is usually not possible to get last minute cheap flights but still you can try websites like Google Flights, Skyscanner, or Momondo, which often have alerts for sudden price drops. Be flexible with your dates and airports, as flying on weekdays or from nearby airports can be cheaper. Consider booking a one-way ticket or using budget airlines for shorter routes. Also, check for last-minute deals on airline websites or through apps like Hopper, which track fare trends. Finally, try booking at odd hours, such as early mornings or late evenings, when prices can be lower.