To calculate month-to-month average rates, KAYAK takes all rates for monthly over the past 12 months for flights from London Heathrow Airport to Austin, removes the highest 0.one% to account for outliers, and after that can take the median of all values for on a monthly basis. Access to this https://travialist.com/story8686433/an-unbiased-view-of-cheap-flights-to-baltimore-from-london