How do you get to dalaran in wow?

To get to Dalaran, there are quest givers in the zone Dragonblight ( for the Alliance in Star's Rest, and for the horde, in Agmar's Hammer) that will teleport you to Dalaran. To use this way, I believe you must level 74 or higher.

You can reach Dalaran by mage portal, or by warlock summons at any level.