Departure times: Choosing an early morning or late at night "red eye" can decrease the cost of your ticket.
Departure Days: Tuesdays, Wednesdays and Saturdays are usually the cheapest days to fly and many comparison sites will let you factor in a few day window into the search. Just be sure to remember a better deal on the flight isn't saving you money if you have to pay for an extra night hotel room and an extra day of car rental.
Booking windows: Airlines use 21 days, 14 days and 7 days in advance booking windows with prices increasing the closure to the departure date.
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