US Postal Office Mailing Services and Estimated Delivery Time

Express Mail - Letter large envelope, package, and mailing tube 70 lbs or less.  1 - 2 days.

Priority Mail - Large envelope, package, and mailing tube 70 lbs or less.  1-3 days

First-Class Mail - Postcard, letter, large envelope, and small package 13 oz or less. 1-3 days     

Parcel Post and Parcel Mail - Packages and a mailing tube 70 lbs or less.  2-9 days*     

Media Mail - Packages 70 lbs or less.  2-9 days*

Bound Printed Matter Mail - 15 lbs or less.  2-9 days*     

Express Mail

Letters, large or thick envelopes, tubes, and packages containing mailable items can be sent using Express Mail. This money-back guaranteed service includes tracking and insurance up to $100. Additional insurance up to $5,000 may be purchased for merchandise. Delivery to most destinations is available 365 days a year, with no extra charge for Saturday, Sunday, and holiday delivery. Express Mail envelopes and boxes are available at the Post Office.

Priority Mail

Large or thick envelopes, tubes, and packages containing mailable items can be sent using Priority Mail. This service is typically used to send documents, gifts, and merchandise. Priority Mail envelopes and boxes are available at the Post Office.

First-Class Mail

Postcards, letters, large envelopes, and small packages can be sent using First-Class Mail. This service is typically used for personal and business correspondence and bills.

Parcel Post

Small and large packages, thick envelopes, and tubes containing gifts and merchandise can be sent using Parcel Post.

Media Mail

Small and large packages and thick envelopes can be sent using Media Mail. Contents are limited to books, manuscripts, sound recordings, recorded videotapes, and computer-readable media (not blank). Informally called "Book Rate," Media Mail cannot contain advertising, except eligible books may contain incidental announcements of books. Media Mail is usually less expensive than Parcel Post.

Bound Printed Matter

Small and large packages and thick envelopes can be sent using this service. Contents are limited to permanently bound sheets of directory, advertising, or editorial matter, such as catalogs or phone books. Bound Printed Matter is less expensive than Parcel Post.

Flat Rate Envelopes let you send your document for one low rate, regardless of how much the item weighs. Flat rate envelopes are available for Express Mail and Priority Mail.

Priority Mail Flat Rate Boxes are $8.10 to any U.S. destination regardless of the actual weight of the piece. They are available in two sizes.

*Estimated Delivery Time depends on distance. Mail takes longer to travel across the country than to travel across town.

I wrote this guide because I didn't find another guide providing an estimated delivery time for shipping.  When I went to the USPS website it took me almost 30 minutes of searching to find the information.  I hope this guide helps you when a member inquires about the delivery time of their purchase.