Spanish world champions, who triumphed over Argentina (1-0 after extra time) in the World Cup football final, are parading through central Madrid streets on Monday afternoon before crowds expected to reach one million, according to authorities.

Earlier, their plane, operated by Spanish airline Iberia, is scheduled to land at Madrid-Barajas Airport at 12:50 local time (10:50 GMT), according to Spanish airport operator Aena.

Afterwards, a celebratory parade will begin on an open-top double-decker bus from near the Moncloa Palace, the residence of Socialist Prime Minister Pedro Sánchez, to Cibeles Square in the heart of the capital, as announced by Madrid governor Francisco Martín before the final match in anticipation of 'La Roja's' victory.

At Cibeles Square, the traditional venue for celebrating Spanish national team and Real Madrid titles, a ceremony will be held on a platform specially prepared for the occasion to honor the players.

Martín said that 'around one million people' are expected to attend.

Authorities announced they will implement additional security measures and special transport arrangements to handle the expected crowds along the parade route.

Martín explained that 2,050 police officers and 400 Civil Guard members will be deployed for the event.

In 2010, when 'La Roja' won their first world title, hundreds of thousands of fans gathered to welcome the players upon their return from South Africa.