As of 2015, it costs between $1.00 to $3.75 to mail a first-class letter to France. The exact cost is depends on the weight of the letter in ounces. Mailing a postcard to France is also a similar price.
Mailing a large envelope to France is more expensive, with costs ranging from $2 to $40. A package varies from $6 to $40. Sending a large envelope or package through Priority Mail increases the costs greatly. The weight limit for sending a package through Priority Mail is 66 pounds. Global Express Guaranteed is the most costly option and could end up costing several hundred dollars depending on the weight of the parcel.