The site you want is
www.alsa.es
The current timetable on the site shows departures as follows:
Daily:
Dept:: Lisbon Gare Oriente: 11:30
Arrive: Seville 19:45
Dept:: Lisbon Gare Oriente: 20:45
Arrive: Seville 5:45
Monday to Fridays - 29th June 2007 till 30th September 2007
This appears to be a second service running parallel to the one above
Dept:: Lisbon Gare Oriente: 20:45
Arrive: Seville 5:45
