Where do I go back to stormwind in the draenor area?

[davidm]

Where do I go back to stormwind in the draenor area?

[Cartman]

If you unlock Ashran you have portals to all cities there. You many need to search a bit.
With a level 3 garrison you even get a protal to Ashran.
Other solutions: set your hearthstone to SW as you still have the garrison hearthstone. And if you are in a guild you can buy a cloak at the guild vendor in a major city (in SW directly to your left when you enter from Elwynn). Depending on your guild's progress there are variants with 8, 4 and 2 hour cooldown.