How Does USPS Ground Advantage Deliver to Alaska and Hawaii?

USPS Ground Advantage is advertised as an affordable domestic ground delivery service that delivers to all 50 states, including Alaska and Hawaii, as well as U.S. territories, possessions, freely associated states, and APO/FPO/DPO ZIP codes (military and diplomatic mail). But how is ground delivery to noncontiguous states and overseas territories possible? Let’s find out!

Introduced in 2023, USPS Ground Advantage replaced three previously existing ground domestic services: USPS First-Class Package Service, USPS Retail Ground, and USPS Parcel Select Ground. The USPS markets it as a reliable and affordable domestic shipping option for packages under 70 pounds, not only to the contiguous states but also to Alaska, Hawaii, and other offshore destinations considered domestic by the USPS, promising delivery in 2–5 business days.

But how can packages be delivered to offshore destinations by ground? They can’t be physically delivered by truck all the way, but the term “ground service” does not mean that packages travel by truck the entire way to their destination. Other means of transportation may be used when ground delivery is not possible, but as much of the route as possible is covered by truck.

Although the USPS does not have an official document explaining how USPS Ground Advantage packages are delivered to offshore destinations, enough information is available from open sources to piece together the process. Generally, light packages under 1 lb travel part of the way by air, while heavier packages between 1 lb and 70 lbs travel by ship. Although delivery by a vessel is not “ground” delivery in the strict sense, it is still a type of surface delivery.

Basically, USPS Ground Advantage packages bound for offshore destinations travel through the regular mail system for most of their journey. They are transported by air or water for the leg from the mainland to the general destination, and then delivered by truck to the final address.

This hybrid delivery may or may not affect the delivery terms. Lightweight packages that are partially delivered by air typically arrive within the promised window of 2–5 business days. However, heavier packages that are partially delivered by ship may take longer to arrive. Since USPS Ground Advantage does not offer guaranteed date-certain delivery, slight delays are considered normal.

This is usually reflected in the USPS holiday shipping deadlines. Customers are advised to mail packages to Alaska, Hawaii, Puerto Rico, and U.S. territories a day or so earlier than to the 48 contiguous states to ensure delivery before December 25.

You should also know that USPS assigns the mode of transportation (air or surface) based on package weight, destination, and sometimes contents. For example, hazardous materials can only travel by surface, even if the package is lightweight. You cannot choose how your package will travel, and its tracking status won’t show the mode of transportation, only the USPS facilities it passes through.