Priority Mail Express International Flat Rate


With Priority Mail Express™ Flat Rate free Envelopes and Boxes, you get affordable and fast international delivery to more than 180 countries. From free shipping supplies and Flat Rate options to no weighing or calculating, up to 4 lbs for envelopes or 20 lbs for boxes, Priority Mail Express International™ Flat Rate service is A Simpler Way® to ship.

Image of Priority Mail Express Flat Rate™ supplies.


  • No weighing or calculating needed -- up to 4 lbs for Flat Rate Envelopes and 20 lbs for Flat Rate Boxes
  • Delivery in 3 to 5 business days1
  • May qualify for Free Package Pickup2 service at your door
  • Includes tracking information with USPS Tracking™

Downloadable Pricing File
Priority Mail Express International - Retail

Compare other USPS® mailing and shipping services ›


You even receive date-certain service with a money-back guarantee to select locations…

France (does not include Corsica and Monaco)
Great Britain and Northern Ireland
Hong Kong
Republic of Korea (South Korea)
Spain (does not include Canary Islands)

Includes Package Pickup2 for some items, tracking information with USPS Tracking, and insurance against loss, damage, or missing contents (up to $100 for documents or $200 for merchandise)3 with additional merchandise insurance available up to $5,000 to certain countries.

For refunds on date-certain service, call 1-800-222-1811.

Some countries have prohibitions and restrictions.
Go to Postal Explorer® ›

1 For many major markets. Average number of days may vary based upon origin and destination. 
2 For details on Free Package Pickup, go to
3 Visit the International Mail Manual, available at for details.

Service/OptionsSize Weight

Letter Envelopes

12 1/2″ x 9 1/2″

up to 4 lbs

Legal Envelopes

15″ x 9 1/2″

up to 4 lbs

Padded Envelopes

12 1/2″ x 9 1/2″

up to 4 lbs


11 1/4" x 8 3/4" x 6"

11" x 8 1/2" x 5 1/2"

up to 20 lbs


14" x 12" x 3 1/2"

13 5/8" x 11 7/8" x 3 3/8"

up to 20 lbs


Customs Forms. Find out what customs forms you need for your international mail. Go. Image of customs forms.Addressing International Mail. Make sure it gets there by addressing your international mail properly. Go. Image of an international envelope with Global Forever® stamp.Ship Online. Print a label with postage and customs forms. Image of a printer with shipping label and customs forms.