You can transfer increments of 1,000 Citi ThankYou Points into 1,300 Avianca Lifemiles through 6/28/19 at 11:59pm MT. The 30% bonus is added by Lifemiles. The terms state that the bonus can take 45 days, but typically Lifemiles posts the bonus within a day.
Note that Avianca Lifemiles require earning activity every 12 months in order to stop your miles from expiring. Transferring points to Lifemiles will extend the points validity for 12 more months.
With this promotion you’ll be able to redeem United award flights for less than 6,000 points each way! You can read more about that and all about the Avianca Lifemiles program in this post.