How much does Flat Rate shipping cost? Shipping costs are a significant factor for both businesses and individuals looking to send packages efficiently. One of the most popular shipping options available today is flat rate shipping. This method offers predictability and simplicity, making it an attractive choice for many. But how much does flat rate shipping cost, and is it the right option for you? Let’s break it down.
What is Flat Rate Shipping?
Flat rate shipping is a shipping method where the cost is determined by the size of the package rather than its weight or destination. This means you pay a fixed rate for a specific box or envelope, making it easy to estimate costs in advance.
How much does Flat Rate shipping cost? Several major carriers, including the United States Postal Service (USPS), FedEx, and UPS, offer flat rate shipping services. Each carrier has its own pricing structure, box sizes, and delivery times.
How Much Does Flat Rate Shipping Cost? Step-by-Step Guide
USPS Flat Rate Shipping Costs
USPS is one of the most commonly used carriers for flat rate shipping due to its affordability and extensive reach. Their Priority Mail Flat Rate service allows customers to use specific USPS flat rate boxes for domestic and international shipping.
USPS Domestic Flat Rate Pricing (as of 2025)
| Package Type | Price |
|---|---|
| Small Flat Rate Box | $10.40 |
| Medium Flat Rate Box | $17.05 |
| Large Flat Rate Box | $22.45 |
| Padded Flat Rate Envelope | $10.60 |
| Legal Flat Rate Envelope | $10.30 |
- Delivery Time: Typically 1-3 business days
- Weight Limit: Up to 70 lbs
- Tracking: Included
- Insurance: Up to $100 coverage included
For businesses or frequent shippers, USPS offers discounts through its online shipping service, Click-N-Ship, and for commercial rates.
USPS International Flat Rate Pricing
USPS also provides Priority Mail International Flat Rate options. Pricing varies based on the destination country.
| Package Type | Price (Starting From) |
| Small Flat Rate Box | $30.35 |
| Medium Flat Rate Box | $61.75 |
| Large Flat Rate Box | $80.35 |
| Padded Flat Rate Envelope | $31.60 |
- Delivery Time: 6-10 business days
- Weight Limit: Up to 20 lbs
- Tracking & Insurance: Included (varies by destination)
FedEx Flat Rate Shipping Costs
FedEx offers a service called FedEx One Rate, which provides predictable pricing without weighing or measuring your package. Unlike USPS, FedEx rates depend on both the box size and the shipping distance.
FedEx One Rate Pricing (as of 2025)
| Package Type | Price (Starting From) |
| Small Box | $11.10 – $19.05 |
| Medium Box | $15.30 – $28.55 |
| Large Box | $23.75 – $45.80 |
| Extra Large Box | $33.00 – $71.05 |
| Padded Pak | $10.95 – $21.95 |
- Delivery Time: 1-3 business days (Express Saver available for cheaper rates)
- Weight Limit: Up to 50 lbs
- Tracking: Included
- Insurance: $100 coverage included
FedEx also offers overnight and two-day shipping options under its One Rate pricing structure, making it a faster alternative to USPS for urgent deliveries.
UPS Flat Rate Shipping Costs
UPS offers UPS Simple Rate, a flat-rate shipping service for domestic packages. Unlike FedEx, UPS pricing is based solely on package size, without factoring in distance.
UPS Simple Rate Pricing (as of 2024)
| Package Type | Price (Starting From) |
| Extra Small | $10.00 |
| Small | $13.00 |
| Medium | $17.00 |
| Large | $21.00 |
| Extra Large | $26.00 |
- Delivery Time: 1-5 business days (Ground shipping)
- Weight Limit: Up to 50 lbs
- Tracking: Included
- Insurance: $100 coverage included
For businesses needing guaranteed express delivery, UPS also provides Next Day Air and 2nd Day Air options with Simple Rate pricing.
Comparing Flat Rate Shipping Options
Cost Comparison
- Best for Small Packages: USPS and UPS offer the lowest pricing for small boxes and envelopes.
- Best for Heavy Items: USPS allows packages up to 70 lbs, making it the best choice for dense shipments.
- Best for Speed: FedEx One Rate and UPS Simple Rate both offer faster delivery options.
Delivery Speed Comparison
- Fastest Overall: FedEx One Rate (overnight and 2-day options available)
- Fastest Economy Option: USPS Priority Mail (1-3 days)
- Best for Heavy Items: USPS (higher weight limits at flat rates)
When is Flat Rate Shipping the Best Choice?
Flat rate shipping is ideal when:
- You are shipping heavy items within the weight limit.
- You want predictable costs without weighing each package.
- You need a reliable tracking and delivery timeframe.
- You’re sending packages domestically or internationally with a fixed budget.
However, flat rate shipping may not be the most cost-effective for:
- Lightweight items that can be shipped cheaper by weight-based pricing.
- Local shipments where standard ground shipping is cheaper.
- Large, bulky items that exceed the flat rate box sizes.
Tips to Save on Flat Rate Shipping
- Use Online Discounts – USPS, FedEx, and UPS offer discounted rates for online purchases.
- Choose the Right Box Size – Picking the right box size ensures you’re not overpaying for unused space.
- Consider Regional Rates – Some carriers offer better rates for short-distance shipments.
- Use Free Boxes – USPS, FedEx, and UPS provide free flat rate boxes, reducing packaging costs.
Final Thoughts
How much does Flat Rate shipping cost? Flat rate shipping provides an easy and predictable way to send packages without worrying about weight or distance. While USPS is often the cheapest for smaller packages, FedEx and UPS offer faster delivery options with similar pricing structures. Choosing the best flat rate service depends on your package size, delivery speed needs, and budget.
By understanding the costs and benefits of each carrier’s flat rate service, you can make informed shipping decisions that save time and money. Whether you’re an eCommerce seller or just sending gifts to family, flat rate shipping is a convenient and efficient solution.
Hello, I am an E-commerce Expert with extensive experience providing services to numerous e-commerce brands and individuals since 2017. My primary areas of expertise include the Amazon, Walmart, and Shopify marketplaces. Linkedin
