How do I send an envelope internationally?

[NyM02]

I need to send something to London and Hong Kong from the US. Do I just need to add more stamps?

thanks

[arrowsup]

It is best if you take it to the post office so they can weigh it and quote the correct postage....and get an airmail sticker attached.

[NyM02]

I know how many stamps to use when shipping within the US - Do i just need the airmail sticker?

[arrowsup]

I'm not sure I understand your question?...did you mean you know how much it costs to send from The US? If that is the case then just write "airmail" on the envelope.

[dfreely]

Sending mail internationally costs more than sending domestically. You need to know the size and weight of what you're sending before you can figure out the price. You don't need an airmail sticker.