The top shipping companies in the USA are USPS, UPS and FedEx, followed by DHL Express for international shipments, Amazon Shipping, and regional carriers such as OnTrac. For the cheapest overnight mail service, USPS Priority Mail Express in a Flat Rate Envelope usually costs least for letters and light items, while UPS next-day services tend to win for heavier boxes and early-morning deadlines.
Each carrier is built for different shipments, so “best” depends on weight, destination and speed. This guide compares the major U.S. carriers on coverage, limits and strengths, then explains which one is usually cheapest for overnight mail. It doesn’t list prices; to see live rates for your package, compare USPS and UPS side by side in the ParcelPath rate calculator.
How do the top shipping companies in the USA compare?
The national carriers differ most on maximum weight, residential coverage and where they’re strongest. The table summarizes the main U.S. parcel carriers.
| Carrier | Network | Max parcel weight | Strongest for |
|---|---|---|---|
| USPS | Every U.S. address, including PO Boxes and APO/FPO | 70 lb | Light parcels, residential delivery, overnight letters |
| UPS | All 50 states plus 200+ countries and territories | 150 lb | Heavier boxes, business deliveries, time-definite air |
| FedEx | Nationwide plus international | 150 lb | Express and time-definite deliveries |
| DHL Express | International express only (no U.S. domestic express) | Varies by service | Imports and exports |
| Amazon Shipping | Amazon’s delivery network | Varies by service | Ecommerce parcels for business shippers |
| Regional carriers (OnTrac and others) | Parts of the country | Varies by carrier | Fast ground delivery within their region |
Why is USPS one of the top shipping companies in the USA?
USPS has the widest reach of any U.S. carrier. In 2025 it delivered to 157.8 million residential addresses and 12.6 million business addresses, and processed an average of 22.7 million packages a day, according to USPS Postal Facts. It’s the only carrier that delivers to PO Boxes and military APO/FPO addresses.
USPS services cover every speed tier: Ground Advantage (2–5 days), Priority Mail (2–3 days), Priority Mail Express (1–3 days with a money-back guarantee) and Media Mail for books and media. All three main services include tracking and up to $100 of insurance on most shipments. Our USPS shipping hub covers each service in depth.
What makes UPS a leading carrier?
UPS is the go-to carrier for heavier and larger parcels, accepting packages up to 150 lb and 165 inches in combined length and girth. Its ground network delivers in 1–5 business days across the contiguous U.S., and its air services include Next Day Air Early, Next Day Air, Next Day Air Saver, 2nd Day Air and 3 Day Select.
UPS also suits business-to-business shipping, where its delivery commitments are most precise. Printer-free shipping is available at The UPS Store with UPS Mobile Barcode.
Where do FedEx and DHL fit?
FedEx runs a large express network with overnight, two-day and ground services and a 150 lb limit for most parcels. It’s a major choice for time-definite express shipments and international deliveries.
DHL Express focuses on international shipping. It doesn’t sell domestic express delivery within the U.S., so Americans mostly use it to send packages abroad or receive imports. For a U.S. domestic shipment, the realistic choices are USPS, UPS, FedEx or a regional carrier.
Are regional and newer carriers worth considering?
Regional carriers such as OnTrac deliver within parts of the country, often with fast ground transit inside their footprint. They’re used mainly by high-volume ecommerce shippers, and coverage stops at their regional boundaries, so they can’t replace a national carrier.
Amazon Shipping uses Amazon’s delivery network to carry parcels for business shippers. For individuals and small businesses, the national carriers remain the practical options because of their nationwide coverage and drop-off networks.
What is the cheapest overnight mail service?
For letters, documents and light items, USPS Priority Mail Express is usually the cheapest overnight mail service, especially in a Flat Rate Envelope, which costs one price to any U.S. address. USPS describes it as 1–3 day delivery by 6 p.m. with a money-back guarantee, so check that your route gets a next-day commitment when you buy the label.
| Overnight option | Delivery commitment | Usually cheapest for |
|---|---|---|
| USPS Priority Mail Express Flat Rate Envelope | 1–3 days by 6 p.m., guaranteed; next day on many routes | Letters and documents going any distance |
| USPS Priority Mail Express (weight and zone) | 1–3 days by 6 p.m., guaranteed | Light packages |
| UPS Next Day Air Saver | Next business day, by 3 p.m. or 4:30 p.m. to most commercial addresses | Business deliveries without a morning deadline |
| UPS Next Day Air | Next business day by 10:30 a.m., noon or end of day, depending on destination | Heavier boxes and firm next-day deadlines |
Heavier boxes change the answer, because Priority Mail Express prices climb with weight and distance, while discounted UPS next-day rates scale better. Our guide to overnight shipping across USPS, UPS and FedEx compares next-day services in more detail.
How do you choose the right shipping company?
Start with the package, not the brand. These rules of thumb cover most shipments:
- Under a few pounds, going to a home: USPS Ground Advantage is usually cheapest.
- Roughly 20 lb and up, or over 70 lb: UPS Ground is usually the better fit.
- Hard next-day deadline: USPS Priority Mail Express for letters and light items; UPS Next Day Air for heavier boxes or morning delivery.
- Perishables: choose speed over base price; our guide to shipping perishables and food explains which services work.
- Pallets or bulk freight: LTL freight is usually cheaper than many separate parcels.
Our guide on how to ship a package walks through packing and labeling, and the guide to shipping services and solutions compares service levels by speed. High-volume shippers looking for the best shipping rates for bulk shipments can find volume strategies there.
How can you get discounted rates from these carriers?
Retail counter prices are the highest prices carriers charge. Discounted commercial rates for USPS and UPS are sold through approved shipping platforms, so you don’t need a high-volume contract to pay less than retail.
ParcelPath offers up to 89% off USPS and up to 85% off UPS, and it’s 100% free: no subscription, no per-label fee, no minimums and no contracts. More than 44,000 customers use it to compare both carriers, schedule free USPS pickups and print labels, or skip the printer with USPS Label Broker and UPS Mobile Barcode. For palletized freight, ParcelPath’s PalletPath service quotes LTL shipments in the PalletPath freight quote tool. For more everyday savings, see our money-saving tips for shipping for less.
Frequently Asked Questions
What are the top shipping companies in the USA?
The top shipping companies in the USA are USPS, UPS and FedEx, which together cover nearly all domestic parcel delivery. DHL Express is a major international carrier but doesn’t offer U.S. domestic express service. Amazon Shipping and regional carriers such as OnTrac also carry parcels for business shippers.
What is the cheapest overnight mail service?
For letters and light items, USPS Priority Mail Express is usually the cheapest overnight mail service, and its Flat Rate Envelope costs one price to any U.S. address. Delivery is guaranteed within 1–3 days by 6 p.m., with next-day commitments on many routes. For heavier boxes, compare discounted UPS next-day rates.
Which shipping company is cheapest for small packages?
USPS is usually cheapest for small, light packages, especially with Ground Advantage, which prices parcels under 1 lb in ounce tiers and delivers in 2–5 days. UPS tends to become more competitive as packages get heavier, so compare both carriers for anything above a few pounds.
Which carrier handles the heaviest packages?
UPS and FedEx accept parcels up to 150 lb, while USPS caps packages at 70 lb. Anything heavier or palletized moves as LTL freight, which is priced by freight class, weight and lane rather than per parcel.
Sources
- USPS Postal Facts: Delivery and Operations
- USPS: Compare Mail and Shipping Services
- USPS: Priority Mail Express
- UPS: Service guide and package size and weight limits (ups.com)
- FedEx: Service and package limits (fedex.com)
- DHL Express: U.S. service overview (dhl.com)
Part of our Frugal Living and Money-Saving Tips: How to Ship for Less guide. Related: Cheapest Way to Ship a Hat.
