First-Class Mail International

Image of an Air Mail envelope with a First-Class Global Forever® stamp.

Affordable International Service

First-Class Mail International® is the most affordable mail class for sending postcards, letters, and flats to Canada and over 190 other countries.

Global Forever® Stamps

Use Global Forever stamps to send letters or postcards weighing up to 1 oz anywhere in the world. Forever stamps are sold at the current 1 oz rate, but they don't expire even if the stamp price goes up. Global Forever stamps are available online at The Postal Store® and Post Offices.

Stamp Prices

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  • Our most affordable international service
  • Can be used for postcards, letters, and large envelopes
  • Eligible for flats up to 15.994 oz
  • Global Forever stamp available
  • Delivery varies by destination
Insurance and Extra Services Details


The price for First-Class Mail International varies based on weight and destination. If a mailpiece exceeds the maximum length, height, or thickness of one rate, it will be charged at the next higher rate. Large envelopes that exceed maximum dimensions will be charged package rates. Calculate expected shipping costs for international shipments using the International Price Calculator.

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Additional Pricing Information

See Pricing Files
Price List (Retail)
Price List (Online/Commercial Base)


All postcards, envelopes, and flats must be rectangular. Letters and flats may contain only documents, no goods. Additional size restrictions apply depending on the type of mailpiece you’re sending.

Weight and Size Restrictions

Can send mailpieces up to 15.994 oz. Size restrictions apply.

View Country-Specific Restrictions

There are restrictions for mailing restricted, prohibited, and hazardous materials, including cigarettes and smokeless tobacco.

See All Restrictions

Customs Forms

If you just need a customs form, use our online tool to fill out the correct form.

Create a Customs Form