Nighttime or morning flights are statistically better for turbulence, compared to those in the day. Although turbulence can't be completely avoided at night, winds are often weaker and thermal convection turbulence is less, making the chances of encountering turbulence reduced.

Generally, no—in fact, night flights are often smoother than daytime flights. Turbulence is frequently caused by "convective currents," which happen when the sun heats the Earth's surface, causing hot air to rise and create "bumps" in the atmosphere. Once the sun goes down, this surface heating stops, leading to more stable air. However, there is a psychological catch: turbulence can feel more intense at night because you cannot see the clouds or the horizon, which helps your brain process the motion. Furthermore, "clear air turbulence" caused by jet streams or mountain waves can happen at any time, regardless of light. Pilots often prefer flying at night because it is easier to spot other aircraft's lights and lightning from distant storms, allowing them to navigate around rough patches more effectively. Another factor is that nighttime air is often cooler and denser, which can improve aircraft performance. If you are a nervous flyer, a late-night or early-morning "red-eye" flight is statistically your best chance for a glassy, still ride, though no flight is ever guaranteed to be 100% bump-free.