Anacapa Island is five miles long, roughly one square mile in sum, and the closest island to the Southern California mainland (roughly an hour boat ride from Ventura Harbor).
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Similar distance (± 0.5%)Hawaii is just as far away from Los-Angeles as Los-Angeles from New York City (3,936 km), Brooklyn (3,941 km), Queens (3,950 km), Montréal (3,965 km), Philadelphia (3,844 km), Manhattan (3,939 km), The Bronx (3,947 km), Managua (4,050 km), Tegucigalpa (3,828 km), Ottawa (3,800 km).
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.