Depending on the destination and which next day service you select, the cost could be as little as $18 to over $100. The USPS offers an "Express Service", Not a Guaranteed overnight service, only the Bonded carriers (UPS and FedEx Express) offer guaranteed overnight.
Nancy this answer is "spot on": "Depending on the destination and which next day service you select, the cost could be as little as $18 to over $100. The USPS offers an "Express Service", Not a Guaranteed overnight service, only the Bonded carriers (UPS and FedEx Express) offer guaranteed overnight."
You could easily calculate a price using USPS website.
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