Several types of mounts exist, all which correspond to one of the four different riding skills: (Apprentice, Journeyman, Expert, and Artisan).
Apprentice: Level 30 Apprentice riding skill (75) costs 35g for training and an additional 10g for the mount, both reduced by the appropriate reputation discount. Rare ground mounts increase movement speed by 60%. It was reduced from level 40 and 90g for training in Patch 2.4.3. At level 30 (since Patch 2.4.3) warlocks can learn the spell Summon Felsteed at the cost of 1g , which grants them a Felsteed mount and Apprentice Riding skill. Additionally, at level 30, Paladins can learn the spell Summon Warhorse from the Paladin Class trainer at the cost of 1g , which grants them a Warhorse mount and the Apprentice Riding skill.
Also, note under the old PvP system (pre-Patch 2.0), that it was possible at riding skill 75 and level 55 to buy and ride the PvP versions of some Epic ground mounts at Rank 11 (A Commander or H Lieutenant General). These mounts are no longer available for purchase for players.[1]
Journeyman: Level 60 Journeyman riding skill (150) costs 600g for training and an additional 100g for the mount, both reduced by the appropriate reputation discount. Epic ground mounts increase movement speed by 100%.
As early as level 55, Death Knights receive their epic ground mount, the Acherus Deathcharger, after the completion of the quests Grand Theft Palomino and Into The Realm of Shadows.
Expert: Level 70 Expert riding skill (225) costs 800g for training and an additional 100g for the mount. There are no reputation discounts available; this skill is learned from Ilsa Blusterbrew in Wildhammer Stronghold, Shadowmoon Valley to Alliance players and from Olrokk, located in Shadowmoon Village in the same zone, to Horde players. Flying mounts are also only usable while within Outland though within the expansion, most areas of Northrend will allow the use of flying mounts, but only at level 77 and above with cold weather flying traning. Rare Flying mounts increase movement speed by 60% on the ground and in the air.
Artisan: Level 70 Artisan riding skill (300) costs 5000g for training and an additional 200g for the mount. The skill is learned from the same trainers who teach the Expert skill, and thus has no discount whatsoever. Epic Flying mounts increase movement speed by 100% on the ground and 280% in the air.
Cold Weather Flying: Level 77 The skill Cold Weather Flying costs 1000g . This non-discountable training grants players the ability to also use their flying mounts in Northrend. Requires at least level 77. Learned from: Hira Snowdawn at Dalaran, Pilot Vic in Sholazar or Roxi Ramrocket in the Storm Peaks.