The cheapest day to buy tickets on Expedia generally varies based on the destination, season, and demand. However, studies suggest that Tuesday and Wednesday tend to be the best days for booking flights at lower prices. Airlines often release fare discounts on Monday evenings, making tickets cheaper on Tuesday. Additionally, booking flights in the middle of the week typically offers lower demand, resulting in more affordable options. For the best deal, it’s also recommended to book at least 3 weeks in advance, avoid peak travel times, and compare prices across different days to find the best rate.
Source: https://www.devex.com/people/what-is-the-cheapest-day-to-buy-tickets-on-expedia-2097198
