Renfe has not released tickets from Seville to either Madrid or Valencia for any days after February 26. We need tickets on the 27th. Anyone have any insight into why they are not yet available. It is only about 45 days out and I have been checking daily. :-(
RENFE does things on their own timeframe and certainly takes their sweet time loading schedules. I ran into this same issue last year and as I recall they opened up tickets about 40ish days out. Just keep checking!
I've also seen Renfe release tickets for some trains then wait days or even weeks to release others on the same day of travel. It may be several weeks yet for yours. Don't worry.