The Cercanías (Suburban), Rodalies (Commuter) and Metric Gauge services do not allow changes.
On AVE (high-speed), AVE International between Spain and France, Alvia, Euromed and Intercity trains, the terms and conditions for changes will depend on the option (Básico, Elige or Prémium) you have purchased:
You can upgrade your journey by purchasing, for an extra cost, unlimited free changes (allowing you to change the date and time of travel as often as you like without being charged for it, only paying the price difference with the new ticket, if any; only for departures and arrivals within Spain), Puente AVE (you can bring your departure forward or delay it on the same day as the journey, without change fees and without paying a price difference) and Superflex Pack (includes unlimited free changes, Puente AVE and full refund, only for departures and arrivals within Spain). These extras are not available on the Basic ticket.
The origin and destination cannot be changed.
On Avant and Media Distancia trains, a ticket may be changed a maximum of three times under the following conditions:
When the ticket is changed to a higher price, the customer will pay the difference between the two and the established change fees will also be applied.
When the ticket is changed to a lower value ticket, the change fees are eliminated.