International rates are based on speed of service rather than content.
How to Prepare Your International Mail
All mail being sent internationally should be accompanied by a completed “charge slip” and must be kept separate from all other mail. International mail that is not kept separate from mail traveling to U.S. destinations could be processed in the wrong classification, which would delay the arrival of your mail item.
All international parcels should be accompanied by a completed and signed online customs form (PS Form 2976 or PS Form 2976A), including packages/parcels being sent to military APOs/FPOs.
When addressing your mail piece, the last line of the address should contain only the name of the destination country spelled in English, in all capital letters and with no abbreviation.
We do not process global mail. This must be processed at one of the local post offices.
Currently, USPS collects all outgoing mail once daily at 3:15 p.m. All outgoing USPS mail brought to Mail Services by 2:30 p.m. will be processed the same day. However, unusual peak periods, equipment down time, and situations beyond our control could cause your mail processing to be delayed, though this is not a common occurrence.