Best days to fly: Depart Nov. 19th, 20th, 23rd, 24th, or 26th; return Nov. 26th or 27th, or wait until Dec. 1st.
For example, flying from New York to Tampa roundtrip from Nov. 19th-27th will cost you $290-$333; for Nov. 24th-Dec. 1st, it'll be $333-$373; and if you fly on peak days (Nov. 25th and 29th), fares can reach $628-$670.
Christmas (Friday, Dec. 25th)
Worst days to fly: Again, flights will be more expensive -- and packed -- if you fly the weekend prior to Christmas (Dec. 19th and 20th); they'll also be expensive if you fly Dec. 23rd, or the weekend after Christmas (Dec. 26th and 27th).
Best days to fly: Depart Dec. 21st, 22nd, or 24th; return Christmas Day or anytime between Dec. 28th and 31st.