Hi,
Eddie is right. Most buses depart from Estación Sur de Autobuses. Only a few companies have their own bus station, such as Auto - Res (
http://www.auto-res.es ) or La Sepulvedana (
http://www.lasepulvenada.es ).
Alsa buses depart from Estación Sur as well (at Méndez Alvaro subway station). You could take the subway from the airport to there or the Aerocity service (
http://www.aerocity.com ). Some Alsa buses also used to have a quick stop at Plaza de Castilla (but I don't think this is the case of buses to Valladolid).
BTW, Alsa also has a special service called "Clase Supra". This is a kind of business class featuring bigger buses with fewer and comfortable leather seats. Note that they are much more expensive than normal services, but some people say it is worth it.
Eddie,
All buses belonging to Continental - Auto company depart now from the new station at Avenida de América. This includes buses to Bilbao and San Sebastian (the old station was at calle Alenza, 20).
[Eventually, some day Madridman will update his transportation page with the update].
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The best tips from your favourite hostal in Madrid.
Hostal Chelo at
http://www.chelo.com [This message has been edited by Antonio (edited 08-12-2000).]