The waitlist option for Spring 2019 is Nov. 29, 2018 - Jan 4, 2019. For instructions on how to waitlist (if available for a course) visit the Office of the Registrar's How to Waitlist page.
Keep in mind, you’ll need to watch your Purdue e-mail account. If you’re eligible for a course, you’ll only have 16 hours to register for this course. If you miss this window, you’ll have to start over and be put at the end of the queue. Questions? Contact your advisor.