None of Moscow's three airports have been closed, but all three were hit with severe delays, including more than a hundred flights being delayed from Domodedovo south of the city.
The snowstorm began early this morning and the Russian Meteorological Office said it expects up to 4 inches of snow to fall in Moscow in a single day.
The Yandex traffic monitoring service said the congestion in Moscow reached the record-high 10 points in the early afternoon, which normally happens only occasionally every year during rush hour.
Unlike in some Western European capitals, snowstorms in Moscow hardly ever disrupt public transport or shut down air traffic.