U.S. citizens need a valid passport to enter Spain, preferably valid for at least six months beyond your entry date. For stays of up to 90 days within a 180-day period, no visa is required under the Schengen Agreement.
As of now, ETIAS is not yet required. It is scheduled to begin operations in the last quarter of 2026 and will include a transitional phase and a grace period (each potentially six months), allowing travelers time to adapt before it becomes fully mandatory.
Upon arrival in Valencia—or any Spanish entry point—you may be asked to show proof of onward travel and sufficient funds. Any stay longer than 90 days requires a national visa.
Please always check official government or embassy websites for the latest entry rules before traveling.