When was the last new SpongeBob SquarePants episode?

As of my knowledge limited to data up to July 2022, the latest episode of SpongeBob SquarePants that has been aired is "Fiasco!/SpongeBob's Road to Christmas". This episode was the 13th episode of season 13 and was aired on June 27, 2022, in the US.

There may have been new SpongeBob episodes released after this date, but since my knowledge is limited to data before July 2022, I cannot provide information about any episodes aired after this date.

For the most up-to-date information on SpongeBob episodes, I recommend that you visit the official Nickelodeon website or other reputable sources of information about the show.