What is the collective noun of a group tickets?

There isn't a widely accepted collective noun specifically for a group of tickets.

However, you could use these options depending on the context:

General:

* Set of tickets

* Batch of tickets

* Collection of tickets

* Group of tickets

More specific:

* Book of tickets (if they are bound together)

* Pile of tickets (if they are stacked)

Ultimately, the best option will depend on the specific situation and what you want to emphasize.