The definite article isn't necessary, and at least in North America, is seldom used in this case (it sounds more natural without it).

Both are correct, but "over spring break" (without "the") is more natural in American English, especially in casual speech. "The spring break" is less common unless referring to a specific break (e.g., the spring break at my university).

In American English, it’s much more common to hear it without an article. I can’t wait for spring break. Did you have a good spring break? What did you do over spring break?

Both are correct options, but it is more common to use with an article. The article would be necessary if you are talking about a specific spring break.

I’d prefer the article here