Priority Mail International - Rates & Features | USPS
www.usps.com › international › priority-mailPriority Mail International ® service is a reliable and economical way to ship to more than 180 countries, including Canada, Mexico, and Australia. Flat Rate option: Ship using free Flat Rate Boxes and Envelopes (envelopes and small boxes up to 4 lbs, medium and large boxes up to 20 lbs), starting at $29.60. Or ship by weight: For packages up to 70 lbs, prices vary by destination country price group and start at $40.45.