Skip Side Navigation
End Side Navigation

Priority Mail Express International Flat Rate


For your business

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 20 lbs for boxes or 4 lbs for envelopes, 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 the maximum limit by each country1
  • Delivery in 3 to 5 business days2
  • May qualify for Free Package Pickup3
  • Includes tracking information with USPS Tracking™4

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)

Downloadable Pricing Files
Priority Mail Express International - Commercial Base®
Priority Mail Express International - Commercial Plus®
Priority Mail Express International - Retail

Compare other USPS® mailing and shipping services ›

Includes Package Pickup3, tracking information with USPS Tracking4, and insurance against loss, damage, or missing contents (up to $100 for documents and $200 for merchandise)5, with additional insurance available up to $5,000 to certain countries. You must pay postage and mail your letter or package at a Post Office location in order to receive the guarantee for date-certain delivery to select locations.

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

Order Free Supplies ›

1 Up to 20 lbs in the Priority Mail Express International Flat Rate Boxes and up to 4 lbs in the Priority Mail Express International Flat Rate Envelopes.
For many major markets. Average number of days may vary based upon origin and destination.
For details on Free Package Pickup, go to Some restrictions may apply.
Limitations may apply for certain destinations.
Visit the International Mail Manual, available at for details.

Service/OptionSize Weight


12 1/2" x 9 1/2"

up to 4 lbs

Legal Envelope

15" x 9 1/2"

up to 4 lbs

Padded Envelope

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

If It Fits, It Ships®. Order free Priority Mail Express International™ Flat Rate Supplies. Mailable items up to 20 lbs. Image of Priority Mail Express™ boxes. USPS Corporate Account™. Charge your Priority Mail Express™ shipments to one account. Go. Image of Priority Mail Express™ supplies. Ship Online.  Print a label with postage and customs forms photo of computer printer with shipping label and customs forms