Originally Posted by
RedChili
The bus that FlyingMoose is talking about is a new thing (which Sydunipete and Aho apparently haven't heard about), is a brand new transfer possibility from T4 to T5. It means that you don't have to go through security again, so you'll save some time, and probably a kilometer of walking.
You're right - the bus is news to me. For part of the year I'm based in Stockholm so never have to transfer there - but I will look out for it next time.
I'm not sure it's a kilometer - but if you can avoid a second round of security that's a good thing.