This isn't the first time this year we've seen a 50% transfer bonus from Chase Ultimate Rewards to Marriott Bonvoy. This promotion started in August, and it's ending soon: September 30, 2023. Marriott Bonvoy is one of the less valuable Chase transfer partners, so this isn't a great deal in comparison to other uses of your Chase points. However, you might want to take advantage of it for the right situation. Here's when it could make sense.