
Class 01 · the fast lane
First-Class Mail
- Cost
- letters from $0.621 · flats from $1.025 · postcards from $0.453
- Speed
- 1–5 business days
- Best for
- time-sensitive letters & documents
- Presort minimum
- 500 pieces
The quickest of the main classes, and the most expensive. It carries the pieces that carry obligations: statements, invoices, renewal notices, anything a recipient is waiting on. Undeliverable pieces come back to you free of charge — no other class in this guide includes that.


