Can you? Is there a way to politely see if a school you’ve been accepted into will pay for you to come see it?
Maybe, if the school really really want you.
You can email the admissions office after you are accepted and ask whether they ever cover all or part of the cost for accepted student flights, and whether you can please be considered if they do. I think 2 of my D2’s colleges sent vouchers with the acceptances. She used one, not the other (and attend the school she went to). But honestly she would have visited again anyway without the voucher…