Short answer: "goodbye" in Spanish is Adiós, or Hasta luego depending on the situation.
Adiós, the core translation
The default way to say "goodbye" in Spanish is Adiós. Pronounced roughly ah-dee-OHS.
When Spanish speakers actually use it
"Hasta luego" (see you later) is used far more often than "adiós".
Alternative: Hasta luego
Hasta luego is the other option Spanish speakers reach for in this situation. It's not a synonym so much as a register shift, use the one that matches who you're talking to.
Practice this in a real Spanish conversation
Reading a phrase and saying it out loud are two different skills. Skala's AI conversations let you drop "Adiós" into a real Spanish exchange in your first 3-minute lesson, so it sticks the first time.
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FAQ
What's the most polite way to say "goodbye" in Spanish?
Both Adiós and Hasta luego are polite. Pick based on who you're talking to: register, not translation, is what natives are tuning into.
How do I pronounce Adiós?
Roughly ah-dee-OHS. Recording yourself once and comparing to a native audio inside Skala closes the gap faster than reading pronunciation guides.