For most people, there isn’t one single delivery service that is always the cheapest; the lowest price depends on where you live, the parcel size/weight, and how fast you need it delivered.

Key takeaway

  • In the US, USPS Ground Advantage is usually the cheapest for small, non-urgent packages, while USPS Priority Mail (and sometimes flat-rate boxes) tends to be the lowest-cost option for 2–3 day shipping.
  • For heavier boxes (around 20 lb and up), discounted UPS or FedEx Ground labels can undercut USPS, especially when bought through online shipping platforms.
  • For international shipments, USPS Priority Mail International is often the cheapest among the big carriers for small parcels, with UPS/FedEx/DHL typically costing significantly more at list rates.

Why “cheapest” always depends

  • Price changes with:
    • Origin and destination (same country vs overseas).
* Weight and dimensions (letters vs bulky boxes).

* Speed (economy vs next-day).
  • In many countries (like the UK or EU), local postal operators plus comparison sites (Parcel2Go, ParcelHero, ParcelCompare) are often cheaper than booking directly with a big-name courier because they aggregate discounted rates.

Rough patterns by situation

  • Small, light, not urgent (domestic):
    • US: USPS Ground Advantage is typically the cheapest baseline service.
* UK: Economy options via Royal Mail or comparison brokers (Parcel2Go, ParcelHero, ParcelCompare) often come out cheapest.
  • Fast 2–3 day delivery (domestic):
    • US: USPS Priority Mail is generally the cheapest common 2–3 day service for small and mid-size packages.
  • Next-day delivery (domestic):
    • US: USPS Priority Mail Express usually has the lowest starting price among major next-day options, with UPS and FedEx overnight services costing more at published rates.
  • Heavy packages (20 lb+):
    • UPS or FedEx Ground often become cheaper than USPS for heavier domestic boxes when using negotiated or online-discounted rates.
  • International small parcels:
    • US to abroad: USPS Priority Mail International or similar postal services tend to be cheapest; express couriers (UPS, FedEx, DHL) are faster but far more expensive at standard rates.

How to find the cheapest for your case

  1. Weigh and measure the parcel (accurately).
  2. Decide the slowest delivery time you’re comfortable with (cheaper is usually slower).
  1. Plug the numbers into:
    • Your national post office site (USPS, Royal Mail, etc.).
 * One or two comparison sites (e.g., Parcel2Go, ParcelHero, ParcelCompare, Shiply) to see brokered discounts.
  1. Compare total price including extras like tracking, insurance, and pick-up fees.

In practice, “which delivery service is cheapest” is almost always answered by:
“Use your national postal service for small/light or slow shipments, and comparison sites or discounted UPS/FedEx-style services for heavier or business parcels.”

TL;DR: There’s no single universally cheapest delivery company, but national postal services (like USPS or Royal Mail) plus rate-comparison sites are usually where the cheapest options show up for most everyday packages.

Information gathered from public forums or data available on the internet and portrayed here.