To determine every month average prices, KAYAK can take all charges for monthly over the past year for round-excursion flights from London to Atlanta, gets rid of the highest 0.1% to account for outliers, after which usually takes the median of all values for monthly. There are also accommodation choices https://singaporebusinessclassflights.blogspot.com/2024/07/top-packing-tips-before-boarding-first.html