There is a common belief that flight prices go down on Tuesdays, but this is not always the case. While it's true that airlines often release new sales and deals on Tuesdays, flight prices can fluctuate based on a variety of factors such as demand, competition, and the airline's inventory. So, Tuesdays can be a good day to check for deals, but it's not a guarantee that prices will be lower.
It's worth noting that the best time to book a flight can vary depending on the destination and the airline, and that it's important to be flexible with your travel dates and to check prices frequently to get the best deal. It's also important to use various tools such as fare comparison websites and fare alerts to monitor the prices and be ready to book as soon as you find a good deal.