Although
Alsa/Enatcar has many routes around Spain, it doesn't go to Seville.
Check out
Secorbus which is the company covering the route.
I agree with Nativo. Alsa is the only bus company who has taken the internet seriously. It's currently the only one selling tickets online.
Regards,
Antonio
BTW, I'm pretty sure there was a link to Secorbus site on a previous post. Please, ALWAYS DO A SEARCH before asking the same questions over and over again.
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The best tips from your favourite hostal in Madrid.
Hostal Chelo at
http://www.chelo.com