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There should be a big grey portal on the upper tier of Oribos, if you got to the point in the intro where you open it.
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Venari’s refuge; go down the ramp to her, sidestep left a bit. You can now see the teleporter that takes you to the Tremaculum and Beast Warrens. Ignore that, run down the path to the right of it; there’s a smaller teleporter there, and that’s the flight route to Korthia. (Yes, I wish it was the same teleporter! Venari’s refuge is becoming a smaller airport off the back of Oribos International Airport.)
Or go to Beast Warrens like I did this morning while still sleep-drunk. It’s not a pleasant run, but it can be done!