If we consider the distance between the closest points of California and Alaska, it is approximately 1,500 miles (2,414 km) from Crescent City, California, to Ketchikan, Alaska. This distance can be traveled by air in about 3 hours.
On the other hand, if we consider the distance between the furthest points of California and Alaska, it is approximately 2,500 miles (4,023 km) from San Diego, California, to Barrow, Alaska. This distance would take approximately 4.5 hours to travel by air.
It's important to note that these distances are straight-line measurements and do not account for the curvature of the Earth. In reality, the actual distance traveled would be longer due to the curvature of the Earth. Additionally, the distance between California and Alaska can also be affected by factors such as weather conditions and the route taken.