A visit might be in order if your son is truly interested in NU and UChgo. They are very different schools (D liked one even though she thought it was too close to home and felt “constrained” by the other). But I, too, would do a cost-benefit analysis to make sure that a trip to Chicago makes sense from your family’s point of view. It depends on the reason for the trip—to demonstrate interest (which may or may not be worth the effort given your son’s stats) or to see how he feels about the schools. If he’s iffy about the schools in the first place, I’d go ahead and apply and if he gets in (and that may be a big “if” for both schools) then schedule a visit.