1. When you want to book everything with points.
Ahh, I love points. Until I don’t. My lovely fiancé flies often for work, always on the same route with the same airline. He’s racked up a lot of points, so we’ve been very excited to be able to upgrade our honeymoon tickets to business class because of them.
But come to find out, when you didn’t purchase a full-price ticket with your points, and then later you want to upgrade to a different class, the airline is going to take a ton of points from you and they’re going to charge you a huge fee. For us, that fee was the same price as our round trip, international, economy tickets. The airline essentially wanted to double the price of our tickets, and take 120,000 points too.
So if you’re a points junkie and haven’t actually used them yet, do your research first. It’s generally better to just use your points to buy a full-price ticket. Or use them to upgrade your domestic flights instead of international ones.