How far is it from the west coast to Asia?

There is no direct land route from the west coast of the United States to Asia, so the distance between the two depends on the specific sea route taken.

* The shortest sea route is via the Bering Strait, which is about 85 km (53 miles) wide at its narrowest point and separates the Seward Peninsula in Alaska from the Chukchi Peninsula in Russia.

There are multiple air routes between US West Coast cities (such as Los Angeles, Seattle, San Francisco etc) and major Asian cities (Tokyo, Seoul, Shanghai, etc). Flying time usually takes around 10 to 14 hours, depending on the specific route and airline.