To calculate every month normal price ranges, KAYAK can take all charges for each month over the past year for round-trip flights from London to Atlanta, removes the top 0.one% to account for outliers, after which you can usually takes the median of all values for on a monthly basis. https://flightstolakecityfromlondon.blogspot.com/2024/12/why-should-you-book-business-class.html