Final answer:
Flights from California to Asia predominantly cross the Pacific Ocean, the world's largest ocean situated between North America and Asia.
Step-by-step explanation:
If you fly from California to Asia, you will cross the Pacific Ocean. The Pacific Ocean is the largest ocean on Earth and lies between North America and Asia, with South America to the east. It is a vast body of water that covers more than 63 million square miles, separating Asia from the west coast of the United States, specifically California. When traveling from California to countries in Asia, such as Japan, China, or South Korea, the most direct flight path typically crosses this ocean. Other oceans, such as the Indian Ocean or the Atlantic Ocean, are not on the direct flight path from California to most of Asia.