The general strike took place little more than two weeks ahead of national elections in Spain
Transport and other public services across Spain have faced serious disruption in the first general strike for 14 years called by the main unions over housing and the high cost of living.
Demonstrations were also planned later on Wednesday, with the biggest protests expected in Madrid and Barcelona. Spaniards are due to vote in parliamentary elections on 29 November.
The head of the big UGT labour union, Pepe Ãlvarez, said the strike was a success with "massive" participation, while Unai Sordo of the CC OO union said turnout was "very significant."
However, the Spanish Confederation of Business Organisations said participation was "low and uneven", depending on the areas and sectors involved.