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USPS vs UPS vs FedEx

No single carrier is cheapest for every shipment. USPS tends to win on lightweight packages and flat-rate options; UPS and FedEx are often better for heavier packages and longer distances.

By Marcus Vance, Contributing Writer, Rates & Calculators
Updated July 2, 2026

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Short answer

For packages under 1 pound, USPS First Class is usually the cheapest option by a clear margin; for 1 to 5 pounds going to a distant zone, USPS Priority Mail is often competitive; and above 5 to 10 pounds, especially at zone 6 or higher, UPS and FedEx Ground rates frequently come in below USPS Priority Mail. The honest answer to "which carrier is cheapest" is "it depends on this specific package" - weight, size, and distance all move the winner.

USPS strengths

Flat rate boxes: ship anything that fits, regardless of weight, at a fixed price. Good for dense, heavy items going far.
First Class: cheapest option for packages under 1 pound.
Delivers to every U.S. address, including PO Boxes and APO/FPO military addresses.
No residential surcharge, unlike UPS and FedEx.

UPS strengths

Ground rates competitive for packages 5+ lbs at most zones.
Strong tracking and guaranteed delivery windows.
Better for commercial-to-commercial shipments where residential surcharges do not apply.
Pickup options and a large network of drop-off locations.

FedEx strengths

FedEx Ground competes closely with UPS on mid-weight packages.
One Rate flat-rate program for certain package types, similar to USPS flat rate.
FedEx Home Delivery covers residential addresses with Saturday service as standard.
Strong overnight and time-definite express options.

Things to know

Any time the package is between 2 and 15 lbs and going more than 3 zones, a quick comparison is worth the 60 seconds it takes. Rate structures shift with weekly fuel surcharges, and the cheapest carrier for a given weight and zone can flip from week to week. Run the estimator before buying a label, or see modeled tiers on the 2026 cost comparison reference.

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Good to know

FAQs

Is USPS or UPS cheaper for shipping?

USPS is generally cheaper for packages under 5 lbs, especially to residential addresses, because USPS has no residential surcharge. UPS is often cheaper for packages 10 lbs and above going to distant zones. The crossover point varies by package dimensions and destination zone.

Is FedEx or USPS cheaper?

For lightweight packages under 2 lbs, USPS is almost always cheaper. For packages 5 to 20 lbs going more than 3 zones, FedEx Ground and USPS Priority Mail are often close, with FedEx sometimes winning on heavier packages. Comparing specific rates for your dimensions and destination is the only reliable way to know.

How much does shipping cost with USPS?

USPS First Class (under 1 lb) typically costs $4 to $7. Priority Mail (1 to 70 lbs) ranges from around $9 for zone 1 to $30 or more for zone 8 at 5 lbs. Flat rate boxes range from about $10 to $22.

Does UPS or FedEx deliver on weekends?

FedEx Home Delivery includes Saturday delivery as standard. UPS delivers on Saturday for an additional fee through UPS Saturday Delivery. USPS delivers Priority Mail on Saturdays at no extra charge and is the only carrier delivering on Sundays.