UPS only delivers on Saturday if the shipper puts "Saturday Delivery" which is $10 extra dollars.
UPS only ships via air to Hawaii... Next Day, Two Day, or 3 Day select. If the package was delayed for reasons other than weather, then the shipper would be able to get reimbursed by UPS for the shipping charges, since they do guarantee their air packages. So if you ordered something online, you may want to ask about shipping reimbursement.
If you have the tracking number, it should say a reason for delay, and an expected delivery date.