The state of Hawaii is about 2400 mi.(4000 km) from California and about 4000 mi. (6500 km) from Japan.
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Planning a trip to the Hawaiian Islands from California? The Big Island is the closest Hawaiian Island, only 2,486 miles away! Direct flights between San Diego, San Francisco, and Los Angeles, and the two international airports on the Big Island: Kona (KOA) and Hilo (ITO), average about 5 hours in length.
A reason for the close ties is the large population of Japanese-Americans in the Islands. While Japanese were in Hawai'i as early as 1806 as survivors of ship wrecks, efforts to bring in Japanese immigrants were not undertaken until King David Kalakaua visited Japan in 1881 to initiate treaty discussions.
A week won't be too long at all. That gives you just enough time to get the aloha in your blood. On our last trip we stayed 10 days and had plenty to do. Theres lots of things to keep you busy...so you can pick a few days to be really active, and a few days to relax.
The closest major city is San Francisco, California, at 2,397 miles (3,858 km). Some islands off the Mexican coast and part of the Aleutian Islands of Alaska are slightly closer to Honolulu than the mainland.
If you're short on time, here's a quick answer to your question: While Hawaii itself is not visible from California due to the curvature of the Earth, its tallest volcanoes can sometimes be seen from California on very clear days.
The air travel (bird fly) shortest distance between California and Hawaii is 3,976 km= 2,471 miles. With an average speed of 560 miles per hour in an airplane, it will take 4.41 hours to make the journey.
The closest country to Hawaii is technically the United States itself, as Hawaii is an integral part of the United States and is located in the Pacific Ocean, about 2,400 miles (3,900 kilometers) southwest of California. However, if you're looking for the closest foreign country to Hawaii, that would be Japan.