Structural collapses and traffic accidents have led to half a dozen deaths as South Korea reports its third-heaviest snowfall in just over a century.

Seoul on Thursday saw its heaviest November snowfall in more than 100 years, as traffic snarled and flights ground to a halt.

South Korea grappled with heavy snowfall for a second day on Thursday, with dozens of flights cancelled, ferry operations suspended and at least four people reported dead in a bitter winter, though conditions showed signs of easing.