​Spain's national airline is Iberia, but the country can also be flown into on many international passenger airlines such as Air Europa, Vueling, Air Berlin, Clickair and charter airlines, both of which fly to many tourist spots in the region. The main train operator is RENFE; the AVE (Spanish high speed train) or Talgo are the intercity services for tourists. Many freeways link the touristic cities.

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World aviation has never been so competitive and the Internet is often the easiest way of locating and booking reasonably priced seats.
Full-time students and those under 26 have access to discounted fares. You have to show a document proving your date of birth or a valid International Student Identity Card (ISIC) when buying your ticket. Other cheap deals include the discounted tickets released to travel agents and specialist discount agencies. ‘No-frills’ carriers, however, sell direct to travellers. Many airlines also offer excellent fares to Internet surfers, and there is no shortage of online agents:
www.cheaptickets.com
www.ebookers.com
www.expedia.com
www.openjet.com
www.opodo.com
www.planesimple.co.uk
www.skyscanner.net
www.travelocity.co.uk
www.tripadvisor.com

Read more: http://www.lonelyplanet.com/spain/transport/getting-there-away#ixzz2ALZviqCx