As of July 2010 a $0.44 stamp covers 1 oz of mail, but it is not linear. The more ounces per letter, the less per ounce.
It would be 61 cents.
The USPS has a site that lists it
2
How many stamps are needed to send a letter from Texas to Alaska?
700 Stamps
20
one
It takes 98 cents to send a letter to Brazil from the US
If it is in the US, one stamp.
It costs $0.94 USD to send a letter to Taiwan from the United States.
-2 and 1/2
one 44c stamp
probably around 20
How much to send a first class letter to Philippines?
How much to send a first class letter to Philippines?