How many stamps does it take for a postcard from Spain to US?

To send a postcard from Spain to the US, it typically requires one international stamp, which currently costs around €1.50 to €2.00. However, postage rates can vary, so it's best to check with the Spanish postal service (Correos) for the most accurate and up-to-date information regarding international postage. Always ensure that the stamp used covers the full postage required for the destination.