Best to check website.
I think to k we ticket prices e is very high of $21 for the tour of carven.
Depending on the season & day of the week, that can vary .. best place to see is on the website (visitlonghorncavern.com) I know at this point of the season, M-F tours start at 10am & Sat & Sun they start at 9:30am . Hope this helps 😎
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