Approximate business-day delivery for a standard letter/envelope:
| Carrier / Service | Transit Time | Notes |
|---|---|---|
| USPS First-Class Mail | 2–5 days | Most economical; no guaranteed date. |
| USPS Priority Mail | 1–3 days | Tracking, $100 insurance included. |
| USPS Priority Mail Express | 1–2 days | Money-back guarantee; 365-day delivery. |
| UPS Ground | 3–5 days | Zone-based; reliable tracking. |
| UPS 3 Day Select | 3 days | Guaranteed. |
| UPS 2nd Day Air | 2 days | Guaranteed. |
| UPS Next Day Air | 1 day | Guaranteed by 10:30/12:00. |
| FedEx Ground | 3–5 days | Similar to UPS Ground. |
| FedEx Express Saver | 3 days | Guaranteed. |
| FedEx 2Day | 2 days | Guaranteed. |
| FedEx Overnight | 1 day | Guaranteed (First/Priority/Standard). |
For critical documents, use a guaranteed service with tracking. For routine mail, First-Class is fine.