As of 2015, the United States Postal Service charges between $1 and $4.50 to deliver a letter to the United Kingdom, depending on the weight of the letter.
A single postcard is one of the cheapest methods of sending a message, costing between $1 and $1.25. The postage for sending a large flat envelope through first-class mail ranges between $2 and $40, depending on the weight. For packages sent through first-class mail, the price can range from $6 to $40. Priority Mail is a more expensive service, with costs ranging from $39 to $210. The maximum package size is 70 ounces.