As summer travel starts to wind down, you may be planning your next trip during the fall or around the holidays. You might also be looking for ways to save money on flights around the holidays if you're also budgeting to buy gifts. If so, we'll tell you the best day to book your flight to help save your bank account. 

The Google Flights team looked over five years' worth of airfare data to find patterns on the cheapest days to fly, the best time for booking your flights during each season and more. Here's what they are.

When is the cheapest day to fly out?

If you're planning to book a flight, you may be trying to find the cheapest option. According to Google, it's cheaper to fly in the middle of the week, rather than on the weekend. Flights that take off between Monday and Wednesday can be between 12% and 20% cheaper than weekend flights. Sundays are an expensive day to depart, Google says.