Travelgirl88, last weekend (16th,17th and 18th) Iberia had a special offer. Domestic flights for only 8€ one way!!. Unfortunately, that offer is over and now the cheapest price you can get is 29€ which is still a good value.
By the way, remember that those prices are without airport taxes.
Try to book in advance and compare prices at Iberia, Spanair and Air Europa.
_________________________
The best tips from your favourite hostal in Madrid.
Hostal Chelo at
http://www.chelo.com