If you're one of the millions of Americans who canceled a flight in 2020 and received a voucher for a future trip in its place, you probably already know that those vouchers have expiration dates, and that you'll want to schedule your "makeup travel" soon.

It turns out you may want to apply a similar mindset to your travel points. With millions of people sitting on points they couldn't spend last year — plus new ones earned from pandemic-era promotions with e-commerce sites and food delivery apps — airlines and credit-card companies are likely to devalue their points in the next few months, experts say.