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When did Homo erectus spread from Africa into Asia?

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Map showing the extent of the Laurentide, Cordilleran, and Greenland ice sheets during the Wisconsin glaciation, roughly 100,000 to 11,000 years ago. The Laurentide Ice Sheet covers most of present-day Canada and parts of the northern United States in light blue, the Cordilleran Ice Sheet covers the Pacific Northwest in teal, and the Greenland Ice Sheet is marked in purple. Modern international and state or provincial boundaries are outlined for reference. — Pleistocene Epoch Ice sheets during the Wisconsin glacial episode penetrated deep into North America.

Homo erectus is believed to have originated in Africa and began dispersing quickly throughout Eurasia, including South and Southeast Asia, starting approximately 1.9 million years ago during the Pleistocene Epoch.1

While the exact timing of this migration is recorded imprecisely, fossil evidence indicates that the species flourished over a long interval of time. By roughly 1.7 million years ago, H. erectus populations were already established in various regions, with specimens from sites in Java, such as Sangiran and Mojokerto, approaching the age of African fossils found at Koobi Fora.2