There are several ways to ship a package to Hawaii, but the cheapest options depend on various factors such as the weight and size of the package, the urgency of delivery, and the shipping carrier's pricing and services. Here are some of the cheapest ways to ship a package to Hawaii:

USPS First Class Mail:

If your package weighs less than 16 ounces, USPS First Class Mail is the cheapest option. It takes about 3-5 business days to deliver the package to Hawaii.

USPS Priority Mail:

USPS Priority Mail is a faster option that takes about 2-3 business days to deliver the package to Hawaii. It is cheaper than FedEx or UPS and is recommended for packages weighing over 1 lb.

UPS Ground:

UPS Ground is an affordable option for shipping heavy packages to Hawaii. It takes about 5-7 business days to deliver the package, but the delivery time may vary based on the distance and location.

FedEx SmartPost:

FedEx SmartPost is a hybrid service that uses both FedEx and USPS to deliver packages to Hawaii. It is an affordable option for shipping lightweight packages that weigh less than 70 lbs. The delivery time takes about 5-10 business days.

It is recommended to compare prices and services from different shipping carriers before deciding on the cheapest option to ship your package to Hawaii. Also, consider using flat-rate boxes or envelopes to save on shipping costs.