I am searching for the best/reasonable flights from the Philadelphia area to Belize in early September. Any suggestions -- I've checked Newark -- Baltimore - Washington etc. I am hoping that the wizards on this site will have some experience in this endeavor and will be kind enough to help out. Best cost I found was around $650 -- maybe that's it!!!!

$650 isn't bad at all. AA sometimes has sales out of JFK through Miami.

The flight from Newark has [most] always been Non-Stop.

The non stop Newark flights are great. However they are seasonal.

And they are only on Saturdays in both directions....although I have seen a Sunday schedule once too.
$650 isn't bad these days!