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Join Date: Mar 2003
Location: Ka ʻĀpala Nui, Nuioka
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Looks like there is an East Ontario station on the Riverside Line that is on Haven - that would be the closest, I think.
Using Union Station as a transit hub to and from Metrolink is probably your best bet. From Union Station to West LA would be Metro Rail (Green Line) to the LAX area and public transit north (Santa Monica Bus or MTA).
I would imagine ONT - LA Westside via public transit taking close to four hours.