Currently an international first class letter of one ounce is 98 cents.
The postage rate for a standard item of mail within Australia was $0.45 AUD in 1997.
The postage rate for a standard item of mail within Australia was $0.45 AUD in 1995.
The postage rate for a standard item of mail within Australia was $0.45 AUD in 2000.
The postage rate for a standard item of mail within Australia was $0.45 AUD in 2001.
The postage rate for a standard item of mail within Australia changed from $0.50 to $0.55 AUD in 2008.
The postage rate for a standard item of mail within Australia changed from $0.41 to $0.43 AUD in 1990.
The postage rate for a standard item of mail within Australia increased from $0.55 to $0.60 AUD in June 2010.
The cost of mailing a standard letter within Australia in 1957 was 4d (four pence).
postage for a postcard sent from Australia to the U.S. costs AU$1.40.
The cost of mailing a standard letter within Australia in 1958 was 4d (four pence). it was very shortly to sky rocket way up to 5d (five pence) the following year.
Postage is about size and weight, not distance.
It depends where you are sending it from... England, the USA, Australia, Iceland?