The cheapest way to ship a package is to buy a discounted label online for the slowest service that still meets your deadline, in the smallest box that fits. For most light parcels that means USPS Ground Advantage, for small heavy items a cubic or Flat Rate option, and for heavier or bulky boxes UPS Ground, so the dependable move is to compare USPS and UPS for your exact package before you pay.
This guide walks through that decision in the order you make it: weigh and measure, pack, pick a speed, compare services, buy the label and hand it off. It doesn’t quote prices, because every rate depends on weight, size and the distance between two ZIP codes. When you’re ready for the number, enter your package in the ParcelPath rate calculator to compare live USPS and UPS rates side by side.
Which service is usually cheapest for your package?
Start with the package in front of you. The table below is a shortlist of the service that tends to cost least for common package types, along with the official delivery expectation and limits for each.
| What you’re shipping | Usually cheapest service | Expected delivery | Key limit |
|---|---|---|---|
| Light parcel, a few pounds or less | USPS Ground Advantage | 2–5 days | 70 lb, 130 in length plus girth |
| Small, dense box | USPS Ground Advantage Cubic or Priority Mail Cubic | 2–5 or 2–3 days | 20 lb and size tiers (commercial only) |
| Books, DVDs, records, educational media | USPS Media Mail | 2–8 days | Eligible content only, 70 lb |
| Heavy item that fits a Flat Rate box, going far | USPS Priority Mail Flat Rate | 2–3 days | Fits the box, 70 lb |
| Heavier or larger box | UPS Ground | 1–5 business days | 150 lb, 165 in length plus girth |
| Pallet or very heavy shipment | LTL freight | Varies by lane | Priced by freight class and weight |
Treat the table as a starting point, not a verdict. Our guide to the cheapest shipping rates by package type explains why each service wins its row, and the guide to the cheapest way to ship a 2lb package applies the same logic to one common weight.
Step 1: Why should you weigh and measure before anything else?
Every carrier prices by billable weight, which is the actual weight or the dimensional weight, whichever is greater. USPS applies dimensional weight to Ground Advantage, Priority Mail and Priority Mail Express packages larger than 1 cubic foot (1,728 cubic inches): multiply length by width by height, rounding each side up to the next whole inch, and divide by 139. UPS calculates dimensional weight on every package.
Guessing costs money twice. USPS Ground Advantage rounds weights over 15.999 oz up to the next pound, so a parcel that is a few ounces over a pound line pays for the next pound, and carriers can charge an adjustment later if the dimensions on the label are wrong. A cheap kitchen or postal scale and a tape measure pay for themselves quickly.
Step 2: How does packaging change the price?
The box you choose can matter more than the carrier. A light item in an oversized box gets billed by size, while the same item in a snug box or a poly mailer is billed by its real weight. Soft goods such as clothing ship well in poly mailers, which add almost no weight; our guide to the cheapest way to ship clothes covers that case in detail.
Size also triggers fees. USPS adds nonstandard fees for packages longer than 22 inches, a higher tier above 30 inches, and packages over 2 cubic feet, and UPS charges more for large packages. Keeping the box under those lines is often the single biggest saving on long or bulky items, which is why moving shipments, covered in our guide to the cheapest way to ship boxes across the country, depend so heavily on box choice.
- Poly mailers: lightest option for soft, unbreakable items.
- Padded envelopes: good for small, slightly fragile items that fit flat.
- Corrugated boxes: needed for fragile or rigid items; choose the smallest size that leaves room for padding.
- Free USPS Priority Mail boxes: only usable with Priority Mail services, so they don’t help if Ground Advantage is cheaper.
Step 3: How fast does the package really need to arrive?
Speed is the most expensive choice you make. Ground services move by truck and cost the least; air and guaranteed services cost more at every weight. USPS lists Ground Advantage at 2–5 days, Priority Mail at 2–3 days and Priority Mail Express at 1–3 days with a money-back guarantee, so a non-urgent package rarely justifies anything faster than ground.
Timing also matters around holidays, when Post Offices close and transit stretches. Check the USPS holiday schedule before a deadline instead of paying for a faster service to make up lost days.
| Speed tier | USPS option | UPS option | When it’s worth it |
|---|---|---|---|
| Economy ground | Ground Advantage (2–5 days) | UPS Ground (1–5 business days) | Almost every non-urgent package |
| Faster, not guaranteed | Priority Mail (2–3 days) | UPS 3 Day Select | Gifts and orders with a soft deadline |
| Guaranteed or overnight | Priority Mail Express (1–3 days, guaranteed) | UPS Next Day Air, 2nd Day Air | Hard deadlines only |
Step 4: Why compare USPS and UPS for every package?
USPS and UPS price differently, so the cheaper carrier flips as weight, size and distance change. USPS tends to win light residential parcels and anything that fits a cubic or Flat Rate option, while UPS tends to win heavier boxes and is the only one of the two that accepts packages over 70 lb. Our breakdown of the key differences between UPS and USPS explains the networks behind those prices.
Specialty services can undercut both: Media Mail is often the lowest-cost way to send eligible books and media, and our USPS Media Mail guide lists what qualifies. For the Postal Service side of a comparison, the USPS shipping calculator guide explains each input that moves a USPS price, and the shipping calculator guide shows how to compare carriers for one box. If you’re worried that the cheaper choice is less dependable, our look at whether USPS is reliable covers on-time performance.
Heavier shipments change the math. Once a box passes roughly 20 lb, see the guide to the cheapest way to ship a 20 lb package, the breakdown of what drives the cost to ship a 25 lb package, and our overview of the best shipping for heavy items.
Step 5: Where should you buy the label?
Buy postage online, not at a counter. Retail counter prices are the highest prices carriers publish, while commercial rates are lower and are sold through online channels; USPS, for example, offers Commercial Rates through Click-N-Ship and approved postage providers. Cubic pricing is commercial only, so you can’t get it at the retail counter at all.
ParcelPath gives individuals and businesses discounted USPS and UPS labels, 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 in one place. If you’re weighing discount platforms against each other, our comparison of ParcelPath against another free label platform lays out the differences, and online sellers can find platform-specific advice in the eCommerce shipping hub.
Step 6: How do you hand the package off without extra cost?
Getting the package to the carrier can be free. USPS offers free Package Pickup from your home or office for eligible services, so you don’t need a trip to the Post Office. If you don’t have a printer, ParcelPath supports printer-free labels: UPS Mobile Barcode at The UPS Store locations and USPS Label Broker at the Post Office, where the clerk prints the label from a code on your phone.
For a full walkthrough of addressing, labeling and drop-off, see our guide on how to ship a package.
Which mistakes make cheap shipping expensive?
Most overpaying comes from a handful of habits that are easy to fix once you know them.
- Paying retail at the counter when the same service costs less as an online commercial label.
- Using a Flat Rate box by default for light items or short distances, where weight-based Ground Advantage often costs less.
- Shipping air when ground arrives in time, especially for nearby destinations that ground reaches in a day or two.
- Oversized boxes that cross the 1 cubic foot dimensional weight line or the 22-inch length line.
- Assuming last month’s winner is still cheapest; carrier price changes and new package sizes shift the answer.
For more everyday tactics beyond carrier choice, our collection of money-saving tips for shipping for less covers bundling orders, reusing boxes and timing shipments.
What’s the cheapest way to ship something too big for parcel services?
Once a shipment is palletized or beyond parcel limits (70 lb for USPS, 150 lb for UPS), LTL freight is usually cheaper than splitting it into many boxes. Freight is priced by class, weight, dimensions and lane rather than per parcel. ParcelPath’s freight service, PalletPath, quotes LTL shipments, and you can get a number in the PalletPath freight quote tool.
Frequently Asked Questions
What is the cheapest way to ship a package?
For most light, non-urgent parcels, the cheapest way to ship a package is a discounted USPS Ground Advantage label bought online, in the smallest box or mailer that fits. Small dense items often cost less with cubic pricing, heavy items in small boxes with Priority Mail Flat Rate, and boxes over about 20 lb with UPS Ground, so compare both carriers first.
Is it cheaper to ship at the Post Office or online?
Online is cheaper. Post Office counters charge retail prices, the highest the Postal Service publishes, while online labels can use lower Commercial Rates. Some options, such as cubic pricing for small heavy boxes, are commercial only and can’t be bought at the counter. Discount platforms like ParcelPath extend those lower rates to occasional shippers at no cost.
Is USPS or UPS cheaper for shipping a package?
It depends on the package. USPS usually costs less for light parcels going to homes and for items that fit cubic or Flat Rate options. UPS usually costs less for heavier or bulkier boxes and accepts packages up to 150 lb, while USPS stops at 70 lb. Because the crossover point moves with distance and size, compare both for each new package.
Do Flat Rate boxes always save money?
No. Priority Mail Flat Rate charges one price per box regardless of weight up to 70 lb or distance, so it saves money on heavy items going far. A light item, or a heavy box going to a nearby zone, often costs less with weight-based Ground Advantage or Priority Mail. Check both before choosing the box.
How do I avoid dimensional weight charges?
Use the smallest box that protects the item. USPS applies dimensional weight only to packages larger than 1 cubic foot (1,728 cubic inches), dividing length times width times height by 139, so trimming a box below that size removes the charge entirely. UPS applies dimensional weight to every package, so a snug box lowers the billable weight there too.
Sources
- USPS: Compare Mail and Shipping Services
- USPS: Ground Advantage
- USPS: Priority Mail Express
- USPS Domestic Mail Manual 283: USPS Ground Advantage (Commercial), cubic pricing
- UPS: Package Dimensions and Weight
Part of our Best Shipping for Heavy Items guide. Related: How Much Does It Cost to Ship a 25 lb Package, Cheapest Way to Ship a 20 lb Package.
