(this is a proposal from Google based on our experience using schema.org Product markup)

Motivation: When users search for and browse different products across the web, they often want to understand what kinds of shipping options might be available to them. It would be useful for Schema.org to have expressivity that allowed various merchants to describe their shipping policies, including cost and estimated delivery times according to delivery location. As always there are various levels of detail that might be made explicit.

Our suggestion is to start with something like the following:

Main concepts:

• Shipping policy URL
• For each product offer:
• Shipping cost
• Estimated delivery time [num days handling, num days shipping]
• Delivery location [Country, state, zip code, etc]
• Link to shipping policy URL

Plus these as "useful to have":

• Modeled on your Shipping Policy page:
• Do you offer Free Shipping above a basket threshold? [ie “Free shipping for orders above $35”]
• Offers that qualify for your Free Shipping threshold could reference this through the shipping policy URL link

This initial version may not support dynamic pricing based on other dimensions, such as the item price or weight or dynamic carrier rates. These are consequently difficult here because of the vast number of potential edge cases, but more potentially could be supported in the future.