The best day to book the cheapest flight tickets on Expedia often depends on a variety of factors, including your destination, travel season, and booking habits. However, industry trends suggest that Tuesday and Wednesday are generally the best days to find the lowest airfares. Many airlines release deals early in the week, and competition often leads to discounted prices on these days.
https://www.devex.com/people/expedia-best-day-to-book-cheapest-flights-tickets-at-lowest-prices-2205326
