Update: This bonus ends today!
You can transfer increments of 1,000 Citi ThankYou Points into 1,250 Avianca Lifemiles through 12/12/18.
You can currently earn an 50K points with the Citi ThankYou Premier card:
With this promotion you’ll be able to redeem United award flights from just 6,000 points each way! You can read more about that and all about the Avianca Lifemiles program in this post.
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.