Not sure about which days are busiest.
We were sailing on the Sunday so we flew out on the Friday to have few days in the sun to gear up to our cruise and then we returned from our cruise on a Thursday but waited until the Friday to fly out.
The Friday flying down was full on the 7:15 a.m. flight but flying home on the 4:30 p.m. flight there was plenty of open seats on the plan.
I think it is hit or miss if it is not around a holiday.
Just one word of warning - once you fly, you will never want to drive again
I could not imagine driving to Florida ever again, it is just so nice to take off at 7:30 and be basking in the sun by 10:30 - 11:00 poolside.
We were sailing on the Sunday so we flew out on the Friday to have few days in the sun to gear up to our cruise and then we returned from our cruise on a Thursday but waited until the Friday to fly out.
The Friday flying down was full on the 7:15 a.m. flight but flying home on the 4:30 p.m. flight there was plenty of open seats on the plan.
I think it is hit or miss if it is not around a holiday.
Just one word of warning - once you fly, you will never want to drive again

I could not imagine driving to Florida ever again, it is just so nice to take off at 7:30 and be basking in the sun by 10:30 - 11:00 poolside.