That would depend on the weight of the letter. Postage is 42 cents per ounce, with each additional ounce requiring more postage. Your local post office can weigh it for you. Or if you have postal scales you can weigh it, then call your post office, tell them how much the letter weighs, and get them to tell you how much postage it will need.
The required postage for a first class letter from California to Florida is one stamp. As of 2014, a stamp costs approximately $0.49.
If I calculated correctly, it should be $1.20.
What is the amount of regular postage that you will have to place on the letter?
Write your letter. Put it into an envelope. Put the address on it. Get the required amount of postage from wherever you are in the world and put it on the envelope. Then mail it.
$1.15 in any valid postage is fine. Just mark the envelope "airmail"
Regular size letter up to 1 oz needs a 42 cents stamp.
$0.72 for a first class letter. If it's Priority or Express it will be more. This might help: http://www.usps.com/international/
A letter balance is a small scale to weigh an item to determine amount of postage required. See AREGO database of the National Postal Museum. Lois
$1.05
44 cents
That depends on where you post it from and what postage you send it by!
i believe you can as long as you put the right amount of postage on.