The state of Hawaii is about 2400 mi.(4000 km) from California and about 4000 mi.(6500 km) from Japan.
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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.
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.
The shortest distance (air line) between Hawaii and Los-Angeles is 2,485.48 mi (3,999.99 km). The shortest route between Hawaii and Los-Angeles is according to the route planner.
The mainland city closest to Hawaii is **San Francisco, California**, which is approximately **2,340 miles** away from the Hawaiian Islands ¹. The estimated travel time by airplane from San Francisco to Hawaii is around 5 hours ¹.
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.
Honolulu is 1197 miles from San Fransisco. Honolulu is 3857 miles from Tokyo. So your answer is Honolulu is closer to the US mainland than Australia or Asia.