Flight route
London to Copenhagen
608 miles - roughly 2.0 hours in the air. You'll fly into CPH.
So - is the upgrade worth it on this one?
On a hop this short, the seat itself barely matters - an hour or two is an hour or two. What premium cabins really buy you here is the lounge, the luggage, the queue-skipping and breakfast. Worth it for some travellers on some trips, but go in knowing you're paying for the ground game, not the seat.
Ask Aster with your dates and it compares live fares in economy, premium economy, business and first side by side - including what the seat itself is actually like - and gives you a straight answer instead of a hunch.
What the seat is actually like
Most flight sites sell you a cabin name. Aster keeps a seat-intelligence library of real aircraft layouts across 25 carriers - so on this route it can tell you whether "business" means a private suite with a door or an older recliner, before you spend the difference. That distinction matters more on Copenhagen than almost any other factor.