Travel agencies, Madrid
You can come here for good prices on charter flights and flights to Asia. They speak english.
The office is at 22nd floor of the tallest building in Plaza de España. From here you can have wonderful views of the city (and even take some pictures!). Use the correct elevators (group 1), don't get mistaken.
A good place to look for CHEAP FLIGHT TICKETS.
Centrally located, between Gran Via and the Royal Palace.