In elementary school, the PTA gave $10 per kid towards the field trips, so however far that went, and then parents would pay the balance. They always used school buses, so there was never any transportation fee. Most trips were no cost to the parents or a nominal fee, like $3
In middle school, the PTA gives $1500 per grade-which is like $5 a kid, but I think it goes to transportation because they always use the coach type buses. Don't ask me why, other than the 8th grade, which has a field trip an hour and a half away, the trips aren't that far..and in fact, the 2nd and 7th grade field trips are both to Liberty Science Center. Cost me $9 for my second grader and like $25 when she got to 7th. LOL @@
High school, I don't know. I can't remember if my freshman went on one this year.