How To Choose The Right Shipping Method For You Among FedEx And USPS Flat Rates

By Gavin | November 07, 2022

As an e-commerce seller, it's important to understand how flat-rate shipping works, especially when it comes to the choice between two exchange line channels: the USPS Priority Mail flat rate, and the FedEx flat rate.

Both shipping solutions have their unique advantages and disadvantages, but which one is better for your business? In this article, we'll break down both shipping services.


What is FedEx Flat Rate?

FedEx One Rate is a shipping service offered by FedEx that provides users with flat-rate shipping rates, especially for large shipments. The courier company introduced an express rate in 2013 for those customers who use FedEx Express Packages, which is a great alternative to other shipping solutions from the courier company. Especially if your company regularly ships packages of the same weight and wants to avoid any unexpected extra charges.

FedEx Express flat rate shipping is based on shipments less than 10 and 50 pounds, which means that you only need to pay a specific flat rate as long as the package weighs less than 10 or 50 pounds. This allows you to increase the number of packages without any additional cost, as long as it stays within the specified weight limit. In this way, the one price you pay actually covers the full price of shipping all your shipments.

FedEx flat rate offers users 12 different types of packaging, including tubes, boxes and envelopes. The weight limit for envelopes is 10 pounds, and as long as your shipment does not exceed this limit, you only pay the flat rate based on the destination and specified delivery speed.

For a 9 /2" x 12 /2" envelope, shipping usually starts at $7.65 and increases appropriately for the specific delivery area, as the longer the shipping distance the greater the cost. shipping prices start at $8.65 for small shipments of 8 /4" x 2 /8" x 11 /4", while medium-sized shipments measuring 8 /4" x 4 /8" x 11 /4" Shipments start at $11.20 for medium-sized shipments measuring 8/4" x 4/8" x 11/4" and increase depending on the destination. Large shipments start at $17.30, while oversized shipments start at $28.05, the same rate as the tube option, also starting at $28.05, with shipping charges increasing based on distance to destination.

FedEx flat rate pricing applies to the following FedEx services.

●First Overnight (delivery by 8 a.m., 8:30 a.m. or 9 a.m. the next day)

●Standard Overnight (delivery by 10:30 a.m. the next day)

●Priority Overnight (delivery by 3pm the next day)

●2Day AM (delivery by 10:30am on the second business day)

●2Day (Delivery by 4:30 PM on the second business day)

●Express Saver (delivery by 4:30 PM on the second business day)

What is the USPS Priority Flat Rate?

USPS Priority Mail Flat Rate, which does not require weighing as long as the package weighs less than 70 pounds. The rates are static and apply to any state in the United States. However, for international shipments, the rate is subject to change based on distance (Zone 1 to Zone 3), with the farther the destination, the higher the cost. Envelope size 9 /2" (x 12 /2") starts at $6.95 and retails at the post office for $7.35.

Shipping starts at $7.50 for a small 8/8" x 5/8" x 11/8" x 11/8" shipment, and $12.80 for a medium-sized 11" x 8/2" x 5/2" shipment. For large shipments of 12" x 12" x 5/2", rates start at $17. Once a package weighs more than 70 pounds, the price changes.

Advantages and Disadvantages of FedEx Flat Rate


-Free packaging for certain services

-Multiple packages of varying sizes available

-Better shipment tracking

-Online access 24/7

-Free declarations worth up to $100

-End-to-end visibility

-Money back guarantee

-45,000 drop-off pickup points


-Weight limits up to 10 pounds (envelopes) and 50 pounds (shipments)

-Fees are based on three regions, the further the region, the higher the charge

-Number of parcels is limited

-Parcel contents must meet predetermined dimensions

-No return label option

USPS Advantages and Disadvantages


-Free shipping boxes

-Flexible rates

-Priority shipping

-No additional charges

-Legal protection


-Weight limit of 70 pounds (shipment)

-Limited shipment tracking capability

-Longer shipping lead time for packages

FedEx and USPS Flat Rate: Which is better for you?

Both FedEx and USPS flat rates are good choices when it comes to shipping solutions that offer flat rate shipping, but it depends on your business needs, specifically factors such as budget, desired delivery speed and distance to destination.

If your business requires flexibility in package size and prioritizes tracking and delivery speed, the FedEx flat rate is recommended. However, if typically shipping larger, heavier shipments and looking to save money by using free shipping boxes, USPS Priority Mail flat rates may be better.