Postage for greeting or postcard from Australia to UK is A$1.60 as of December 2011.
Unless your card is larger than normal, it shouldn't cost any more than a first-class postage stamp to mail a Christmas card from the US to the UK.
$1.20 is the rate in December, 2015.
As of December 2013, mailing a standard Christmas card weighing 2 - 3oz from the US to the UK would cost $3.00 if sent via International First Class Mail (cards & letters are normally sent First Class). You may pay less if it is a lighter card. You may pay more if you include any extra weight or choose to send via Priority or Express mail.
+98
The rate is $1.82.
w much postage for average birthday card airmail to Australia
Postage to Europe from the US is 98 cents for a one-ounce letter.
Just mailed one today - $0.98
1843 is when it was produced in the UK
Using an average birthday card size and weight, about $2.30.
It costs $1.15 cents as of the end of July 2017, but this is for a standard-size card- if it is bigger than that, check the United States Postal Service website for more details to be on the safe side.