Originally Posted by
Kacee
It doesn't "always" cost more. But there's no discounted Saver inventory bucket for premium economy, only "Everyday" awards (ON). So if you're looking at a Saver business class ticket (I/IN) vs an "Everyday" premium economy ticket (ON), the PE award will price higher. When comparing "Everyday" awards, business class (JN/ZN) will usually (but not always) price higher than ON.
Speculation, but UA likely doesn't offer "Saver" PE economy because PE is targeted at business travelers, not those redeeming points for leisure travel.
I have definitely seen some flights where Premium Economy was priced higher (in miles) than even Everyday Business. Made no sense to me.