The 27th and 28th are probably the two highest cost dates to leave. The week prior to Xmas you can fly round trip for under 500. Leaving on 27 or 28 at least 1000. Everything will be sold out so they are not going to discount. If you can push your departure back to Friday prices drop rapidly. Last year the 27th fell on Sunday Christmas weekend. I suspect demand was much lower accounting for the price change.
G

Last edited by GeorgeC1; 09/10/2016 10:48 AM.