To Determine daily normal costs, KAYAK takes all rates for each day prior to departure over the last year for flights from London Heathrow Airport to Austin, removes the top 0.1% to account for outliers, and afterwards takes the normal of each of the values for each and every month. https://businessclassflightstobangkok.blogspot.com/2024/07/what-are-top-things-to-do-in-sri-lanka.html