I still get a kid-level giddy whenever I hunt down a weird SpongeBob episode — pirates included — so here’s what I usually do. The most reliable place to start is '
Paramount+' (formerly CBS All Access). They host a ton of Nickelodeon shows, and in my experience you can usually find full episodes of 'SpongeBob SquarePants' there, including the ones featuring the Flying Dutchman and other pirate-y storylines. The Nickelodeon app and website also stream episodes, though you might need a cable login or a subscription to watch full-length episodes rather than clips.
If you don’t want a subscription, buying single episodes or full seasons works great: iTunes/Apple TV, Google Play Movies, Amazon Prime Video (purchase/rental), and Vudu often have individual episodes for sale. I’ve bought a handful of favorites this way so I can rewatch them without hunting through menus. YouTube also sells episodes officially through its Movies & Shows section; just make sure it’s an official upload from a verified provider.
Free-ish options exist but vary by region and rotation. Services like
Pluto TV or the free Nickelodeon channel on some platforms occasionally play older episodes, and some public library digital services (for example, Hoopla) sometimes carry seasons — depends on licensing in your area. Netflix and Hulu have carried 'SpongeBob SquarePants' in certain countries at different times, but availability changes, so I always double-check with a quick search or use a site like JustWatch to see who's streaming what in my country. If you tell me your country or which pirate episode you mean (for instance, the one with the Flying Dutchman — 'Shanghaied'), I can help narrow it down.