Honolulu to St. Louis Turbulence Forecast

HNL → STL · 4,123 miles · ~8h 45m

What to Expect

The Honolulu to St. Louis flight is a long one, almost nine hours heading northeast and crossing a wide variety of terrain and weather systems. Expect some bumps. Early in the flight, over the Open Pacific, you might encounter Oceanic Clear-Air Turbulence or some Oceanic Convection. As you approach the Pacific Coast and later cross the Sierra Nevada, the Central Rockies, and the Front Range, be prepared for Mountain Wave Turbulence. Over the Great Plains, you could experience Clear-Air Turbulence. The most significant turbulence will be over Tornado Alley, where you might experience Severe Convective Turbulence; and the Mississippi Valley, where you might encounter Convective Turbulence. Pilots are very familiar with these patterns, watching weather reports and radar closely to navigate the smoothest possible path. It's all part of a normal day at work for them.

Flights between Honolulu and St. Louis cross the Sierra Nevada, a steep mountain barrier in eastern California. The Sierra generates some of the most intense rotor and wave turbulence in the world — the famous "Sierra Wave" can reach the stratosphere. East-side downdrafts are especially sharp, and flights into or out of Reno or the Central Valley often feel the effects.

Turbulence Factors on This Route

• Oceanic Clear-Air Turbulence: Transoceanic jet stream crossings produce extended stretches of clear-air turbulence over the open Pacific.
• Oceanic Convection: Isolated thunderstorms over warm Pacific waters can develop away from radar coverage, catching flights off guard.
• Mountain Wave Turbulence: The Sierra Nevada produces the well-known Sierra Wave, one of the strongest mountain wave systems in North America.

When Is This Route Bumpiest?

For the smoothest possible flight, aim for summer, early fall, or fall. The air tends to be more stable during these months. Winter, late summer, early spring, spring, and early summer tend to be bumpier. This is because the temperature differences between air masses are greater, leading to more Clear-Air Turbulence and Convective Turbulence; and stronger winds over the Mountain West, which increase the chances of Mountain Wave Turbulence. Tornado Alley is most active in the spring, which brings Convective Turbulence.

Tips for This Flight

If you are able, book a morning flight; the air tends to be calmer then. Any turbulence you encounter will likely feel like driving on a bumpy road or the sensation of riding in a boat on choppy water. To help stay calm, choose a seat over the wing, where there is less motion, and remember to stay well-hydrated. Taking slow, deep breaths can also help regulate your nervous system. Know that the crew is trained to handle turbulence and will keep you informed and safe.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.