You must be talking about the tour to Mendenhall Glacier then. That's a whole other place, and it's not a tidewater glacier.
Hubbard Glacier is more than 200 miles northwest of Juneau in Yakutat Bay / Disenchantment Bay.
This excursion doesn't show up for the April 29 Alaska cruise on the Sapphire. Maybe it's too early in the season for that, as a local vessel is used for this tour.