Count door to door, not airport to resort. The brochure time starts when the bus moves, not when you clear customs at New Chitose with two board bags in a snowstorm. Add an hour to everything in January and February, because the storms that bring the powder also slow the roads. The rail picks, Tomamu and Myoko, dodge this almost entirely.
Flying into the right airport beats picking the closest famous resort. Asahikawa instead of New Chitose puts Kamui and Furano under an hour away and usually costs little more from Tokyo. Yamagata does the same for Zao. The extra domestic leg often saves more time than it spends, and the inland snow it unlocks is drier than the coastal falls.
Short transfer does not mean small skiing in Japan, which is what makes the country special. An hour from a runway here buys snowfall that Colorado markets as a miracle. Pair this list with our Japan powder ranking to weigh snow against convenience, and see the Japan guide for passes, rail logistics and costs. Resorts like Niseko and Happo One remain superb; just book them knowing the ride.