Delivery speed depends entirely on the USPS service level purchased. All estimates are business days and assume proper packaging, correct addressing, and no weather/disruption delays.
| Service | Typical Transit | Best For | Tracking | Insurance Included |
|---|---|---|---|---|
| First-Class Mail (letters/flats ≤13 oz; parcels ≤15.99 oz) | 2–5 days | Lightweight, non-urgent items | Letters: no; Parcels: yes | Up to $100 (parcels only) |
| Priority Mail | 1–3 days | Most packages; e-commerce standard | Yes | Up to $100 |
| Priority Mail Express | 1–2 days (guaranteed1) | Time-critical documents/goods | Yes | Up to $100 |
1 Money-back guarantee if delivery commitment missed (exclusions apply).
For guaranteed overnight, consider UPS Next Day Air® or FedEx First Overnight®—typically 1 business day NY→UT but at 3–5× USPS cost.