The most reliable way to secure a window seat is to select it during the initial booking process using the airline's digital seat map. In 2026, most carriers (including low-cost ones like Ryanair or IndiGo) offer "preferred seating" for a fee, typically ranging from $10 to $40. If you don't want to pay, your next best chance is to check in precisely 24 hours before departure as soon as the window opens; this is when the airline releases the remaining unassigned seats for free. For those looking for a specific view, websites like SeatGuru or AeroLOPA provide detailed layouts of specific aircraft models, highlighting which rows have "misaligned" windows (where you might end up staring at a plastic wall) or which side of the plane offers the best view for a specific route (e.g., the right side for the Manhattan skyline when landing at LGA). If the flight is not full, you can also politely ask the gate agent about a window seat, though success here is less certain than early digital selection.