when is the cheapest day of the week to fly
The cheapest days to fly are usually Tuesday, Wednesday and Saturday. While your information may be only anecdotal evidence, it probably confirms what FareCompare.com's careful study of airline supply and demand confirmed in a 2011 study of U.S. carriers.
The cheapest days to fly are Tuesdays, Wednesdays and Saturdays: This is a somewhat rigid rule, but while there is a little give, there are firm structural reasons why it works.