How To Get To Dalaran

The modern magical city-state of Dalaran, constructed from the ruins of the old demolished city by Lord Garithos and a companion of powerful wizards called the Kirin Tor. Their beloved city was quickly rebuilt and encased it in a bubble that distorts time and space to make it impenetrable to any further attack.

With the threat of the insane Malygos and the Blue Dragonflight looming, the Kirin Tor under the leadership of Rhonin have hastily used tremendous magical power to transport Dalaran to levitate just north of the Dragonblight, in Crystalsong Forest. Deciding to put aside their differences with the Horde with persuasion from Jaina, the works of Antonidas on the orcs and relations with the reformed Blood (High) Elves, Dalaran will serve as a major stronghold for assaults on the Nexus and even Icecrown itself.

As many people are asking how to get to this magical city, we’ll summarize the steps listed in WOW wiki:
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There are several ways to get to Dalaran:

Mages need to talk to the human archmage Modera or bloodelf Aerteas in Dragonblight and pick up the quest [73] Attunement to Dalaran in order to learn the Dalaran teleportation spell available at level 71.

Mages can learn a portal to Dalaran at 74 from the portal trainer. This allows anyone to get to Dalaran.

Anyone who is at least level 74 can complete [74] The Magical Kingdom of Dalaran from either Magister Dath’omere at Valiance Keep, Borean Tundra, Image of Archmage Aethas Sunreaverω τ α at Agmar’s Hammer, Dragonblight or Image of Archmage Modera at Stars’ Rest, Dragonblight. Compleation of this quest will grant a one time portal to Dalaran.

Once in Dalaran (via the quest at 74 or via a Mage portal or a Warlock summon), [74] Learning to Leave and Return: the Magical Way can be obtained (provided you’re at least level 70?) which “attunes” you to Dalaran, and you can return any time via the Teleport to Dalaran Crystal from Crystalsong Forest.

Someone already in Dalaran can group-invite you for PvP at the city’s Battlemasters. After you leave the battleground you will spawn in the floating city. However, the inviting player has to be of the same level range for the specific battleground pool as you, or you won’t get the group-invite.
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Ok. You got in, but how do you get out?

You can use the flight path located on Krasus’ Landing

You can launch your own flying mount from Krasus’ Landing (you cannot fly elsewhere in the city, if you try and fly over the city, you are warned, and then are dismounted, you float to safety with a parachute)

You can use one of the portals to major cities, or the portal to the Caverns of Time (located in The Violet Citadel)

You can exit through a sewer pipe - there’s a long drop - so launch out using your flying mount (although someone did say a parachute would open before you hit the ground - I tested this and think I chickened out and pressed my druid flight form just as the parachute was appearing - it left it a bit late