To get anywhere with real sun as opposed to pleasantly warm you will have to go a fair old way not just a couple of hour flight. we tend to go to florida dec/jan because it is around 26 degrees which we find ideal. however, flights get booked up really quick as it is so busy then plus we have just booked to go away on the 29th dec and the price is almost double what it is in Dec. if you could fly on the 1st or 2nd jan you would find it a lot cheaper. suggest you have a look at climate websites to work out what temp you want first then start hitting the keyboard to find prices. would say that overall this time of year is the same prices as school summer hols but you might be lucky and get a bargain.