I don't think flights price would change if we flew Friday night to Tuesday from Thursday night to Monday nite. We would stay value. But which would be less busy in the MK all day Friday or all day Monday which would be the holiday? My sister will be in Florida, My SIL is a teacher and could miss one day either before OR after the weekend. The 15th would be son's 6th Birthday. So if we threw in a weekend trip which would be better? Thanks. The holiday is Feb 19th.