Formal:
* Panghuling Salita (literally: "Final Words")
* Mga Panghuling Salita (literally: "The Final Words")
* Pagtatapos na Salita (literally: "Closing Word")
* Mga Pagtatapos na Salita (literally: "Closing Words")
Informal:
* Pangwakas na Salita (literally: "Final Word")
* Mga Pangwakas na Salita (literally: "Final Words")
* Paalam na Salita (literally: "Farewell Word")
* Mga Paalam na Salita (literally: "Farewell Words")
You can also use more specific phrases depending on the occasion:
* Pagbati (Greetings) - If you're giving a closing speech at a celebration.
* Pasasalamat (Thank You) - If you're expressing gratitude at the end of an event.
* Paalala (Reminder) - If you want to leave the audience with a key message.
Ultimately, the best translation of "closing remarks" will depend on the specific situation.