This http://www.quora.com/Why-do-airfare-...luctuate-daily is a fairly good explanation on airfares. Just know there are a limited number of seats available at set prices. If someone bought the 2 cheapest seats just prior to you, you would be shown the next least expensive airfare.
Just know that if there is no one flying to Aruba you will see those $385 fares.
If everyone wants to go to Aruba then the fares will be much higher.
We're looking at a bunch of different options - an overnight in Miami, leaving Aruba a day early, flying out of LGA or JKF, spending a day in Boston and getting to Aruba a day late. I need time to actually sit and play around with options
Arashi Beach, Hyatt, Radisson, Shopping, Flea Market, Downtown, Palm Beach, Everything
Jacki, check the seating for the dates you want. About a month or two after we booked, we noticed the plane was full and has been since like two months ago. Now that's a bit early for every seat to be taken and then we realized, I bet its a wedding in Aruba. So of course the few seats available now are like $800 or more. We were constantly watching even though we had booked and then boom, in a week all these seats were taken. Maybe you can adjust your day one or two days either way. It could make a world of difference in the price.