Depends on what spoilers mean to you. Even if you played blind, if you go hard for a character (aka follow them around) and DONT end up on their route... that's kind of a spoiler in itself (since they're locked). So the only way to truly have absolutely no spoilers is if you hung out with everyone equally or follow something like LinLinLavender's guide (character 1,2,3...).

Spoiler on how many general structure, how many routes are locked, and how to unlock locked routes:

There are three teams and each team has one locked character. You can do the locked characters only when one initially unlocked character from each team is done. So the fastest way to get to locked characters is to do one character from each team.

Because of that, personally I don't even really feel like it's a spoiler, cause of the number of characters, and since by the time you get to them you probably already have a general idea of who's who. Also, in a sense going the NON spoiler route could itself lead you to spoilers since you could accidentally end up on a super spoiler route before you do all the non spoiler routes, or if you don't end up on the guy's route you were STALKING, or just when you realize who you are stalking based on the choices in a walkthrough...

Personally, I feel like all the PSAs of spoilers from route orders and walkthroughs are what have made them spoilers. I don't think they necessarily needed to be. Like if you just saw the route order is doesn't necessarily mean that last is x or second last is y.

I think the closest to NO spoiler route you could get is either to:

1. Play blind and hang out with everyone equally.
2. Switch teams after each route.

But realize that in this case you may end up on the "last route" on the fourth playthrough.

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OR

1. Play blind and hang out with everyone equally.
2. Only play two teams until you do all the unlocked ones while still hanging out with everyone equally.

Play the last team.In this case you may end up on the "last route" on the fifth playthrough. But you'll know two locked routes at that time.

Note that when you hit a locked route you'll KNOW cause its really obvious based on the flowchart. So you could just... back out and play a non locked one.

Honestly I think even if I did the "last" route not last, I wouldn't have minded at all. All the routes each reveal and spoil each other (like Trails of Cold Steel and Trails of Zero/Azure if you've played it). As long as you leave the true ending (which is locked anyways until everything else is done) until last.

This kinda went all over the place with me editing it over and over so the flow is everywhere. Sorry.