USPS Priority Mail International Flat Rate

International shipping doesn’t have to come with unpredictable costs. USPS Priority Mail International® Flat Rate simplifies global shipping with fixed pricing—if it fits in the box, it ships for the same rate regardless of weight (up to 70 lbs, depending on the packaging and destination). With delivery to more than 190 countries and typical transit times of 6–10 business days, this service offers a reliable balance of cost and speed. Through Shippo, merchants can access discounted Flat Rate pricing starting as low as $27.10, making it easier to expand internationally without navigating complex rate tables.

Is USPS Priority Mail International Flat Rate?

Rather than paying according to your package’s weight and destination country, USPS Priority Mail International Flat Rate allows you to pay one flat price for shipments up to 70 pounds. USPS delivers to over 190 countries, and packages typically arrive in 6-10 business days, with discounted pricing in Shippo starting at $27.10.

To ship USPS Priority Mail International Flat Rate, you must use Flat Rate packaging from USPS. You can send packages up to 4 pounds with a Flat Rate envelope or a small Flat Rate Box, or send packages up to 20 pounds with a medium or large Flat Rate Box.

Here are some specific packaging options offered by USPS, along with their dimensions and discounted pricing through Shippo:

• Small Flat Rate Envelope (10” x 6”) starts at $27.10
• Flat Rate Envelope (12 1/2″ x 9 1/2″) starts at $27.10
• Small Flat Rate Box (Outside: 8 11/16″ x 5 7/16″ x 1 3/4″) starts at $28.10
• Medium Flat Rate Box (Outside: 11 1/4″ x 8 3/4″ x 6″) starts at $51.90
• Large Flat Rate Box (Outside: 12 1/4″ x 12 1/4″ x 6″) starts at $67.50

While they will pick up your package and initiative its journey, it is important to note that USPS doesn’t actually deliver packages to customers through this service level. Instead, deliveries are passed off at the border, and the final destination country’s postal service makes the final delivery. As a result, actual delivery times depend on the speed, efficiency, and infrastructure of your end destination country.

What are the Benefits of USPS Priority Mail International Flat Rate?

There are two main reasons why e-commerce merchants choose this shipping option. First of all, it’s affordable. Although USPS has faster services (Priority Mail Express International gets packages to their destination in 3-5 days, for example) USPS Priority Mail International Flat Rate is significantly cheaper. Priority Mail Express International starts at $45.95, while USPS Priority Mail International Flat Rate starts at just $27.10. Effectively, this means you’re spending less than half what you would pay to ship through other USPS international services.

And second, USPS Priority Mail International Flat Rate service offers several great features, including:

• Insurance on packages ($100 for documents and $200 for merchandise)
• USPS tracking (Limitations may apply for certain destinations, and tracking is not available for Priority Mail International Flat Rate Envelopes or Small Flat Rate Boxes)
• A return receipt

You may also qualify for free package pickup from USPS at your home or business.

Who is USPS Priority Mail International Flat Rate Best Suited For?

This service is ideal if you’re looking for a mix of affordable shipping and timely delivery for international shipments. As mentioned above, USPS does have faster options, but those do cost more than Priority Mail International Flat Rate. While USPS does offer the cheaper option of First-Class Package International Service, that service level has a weight limit of 4 pounds, and it can take up to 4 weeks for packages to reach their destination.

By balancing cost with speed, USPS Priority Mail International Flat Rate is essentially a “the sweet spot” for international shippers, and it’s an excellent choice if your delivery can wait 6-10 days. It’s also a nice option if you don’t want to deal with variable pricing based on package weight and destination country, and would instead prefer a flat rate.

Predictable Budgeting for Heavier Global Shipments

Shipping heavier items internationally can quickly become expensive with weight-based pricing. Priority Mail International Flat Rate helps control those costs by offering fixed pricing across four packaging types: envelopes, small boxes, medium boxes, and large boxes. This means dense items that would normally cost significantly more to ship can often be sent for a predictable price when packed into Flat Rate packaging.

This pricing consistency makes it easier for businesses to plan shipping costs and incorporate them into product pricing or checkout fees.

Flat Rate shipments also include useful built-in features such as $200 of merchandise insurance, tracking, and free carrier pickup. When you create labels through Shippo, customs forms are automatically generated using your order information, helping simplify international documentation. While final delivery is handled by the destination country’s postal service, USPS tracking keeps both you and your customers informed throughout the shipment’s journey.

Save Big on International Shipping With Shippo

If you’re planning on shipping via USPS Priority Mail International Flat Rate, Shippo can make it even more cost-effective with discounts as big as 90% off of Retail pricing. We partner with over 60 carriers from around the world, including USPS, and can help you get the absolute lowest rates on all your international shipments.

In addition to giving you access to great rates, you can also use Shippo to:

• Create and print discounted shipping labels
• Easily generate return labels
• Validate addresses to prevent failed deliveries
• Conveniently schedule pickups
• Build customized tracking pages
• Send branded notifications to customers
• Get an up-to-date Estimated Time of Arrival (ETA)
• Generate in-depth reports to optimize your shipping spend and increase your overall efficiency

Need help navigating the complexities of global shipping? In addition to offering discounted rates, Shippo can help with any customs forms processes you’re subject to. Simply sign up to start taking advantage of Shippo’s extensive carrier network and exclusive discounts.