Is the flight to Japan turbulent?
Cruise over the open Pacific is usually smooth, but flights cross the world's strongest jet stream off the coast of Japan, where clear-air turbulence is common — especially in winter. Eastbound flights (Japan→US) ride the jet; westbound flights (US→Japan) fight it and take longer, but both can hit CAT near Japan.
When is the smoothest time to fly to Japan?
The jet stream is weakest in summer, but the August–October typhoon season can add convective turbulence near Japan. Winter has the strongest jet and the most clear-air turbulence. Spring and early summer are often the calmest overall.
Why is there so much turbulence near Japan?
The subtropical and polar jet streams merge off the coast of Japan into the fastest winds on Earth — often over 200 mph at cruise altitude. The sharp wind shear at the edges of this jet creates frequent clear-air turbulence, which is invisible on radar.
Where should I sit on a flight to Japan?
Over the wing, near the aircraft's center of gravity, gives the steadiest ride. Keep your seatbelt fastened even when the sign is off — clear-air turbulence over the Atlantic can appear suddenly. Overnight eastbound flights often cross the jet stream while you are sleeping, so belt over the blanket.