There isn’t a single fixed “highest dungeon” for an average-geared Affliction warlock, because it depends a lot on patch balance, affixes, your exact item level, and how carefully you play. In general, Affliction is one of the stronger solo specs in WoW because it has sustained damage, self-healing, and tools for controlling packs, while community discussion also describes it as relatively less gear-dependent than many specs.

Practical answer

For average gear , a solo Affliction warlock can usually handle:

  • Lower-to-mid difficulty dungeon content reliably.
  • Higher dungeons only when the pulls are controlled, bosses are manageable, and the dungeon does not punish long fights too hard.
  • Content above that range becomes very skill- and gear-sensitive rather than spec-only.

What usually limits soloing

The biggest blockers are not raw DPS alone, but:

  • Burst damage from bosses or trash.
  • Multiple mobs that overwhelm sustain or interrupts.
  • Mechanics that require two players or fast objective handling.
  • Time pressure , since Affliction is often better at steady damage than explosive clears.

Rule of thumb

A good shorthand is:

  • If the dungeon is mostly about attrition, Affliction tends to do well.
  • If it has heavy burst checks or strict mechanics, soloing becomes much harder.
  • “Average geared” usually means you can solo content below your group’s intended level, but not consistently push the hardest current-endgame dungeon tiers.

Bottom line

If you want the most honest answer: an average-geared Affliction warlock can often solo lower and some mid-tier dungeons , but the exact “highest” one varies too much by expansion and tuning to name a universal ceiling from static info alone. The safest expectation is that Affliction is solid for solo farming and older content, while current high-end dungeon soloing is situational rather than guaranteed.