Board Thread:Questions and Answers/@comment-27785317-20160615194725/@comment-24498717-20160620051248

Ninja Jurius wrote: For me is. But 'm not from USA. I'm from the US and I can safely say that it's free but also covered in advertisements.

I may be wrong, but I do believe there are some Ninjago episodes on Dailymotion, which has less ads. Maybe you could try that.