The Practicalities of Owl Post

So I was reading a Harry Potter fic, and something occurred to me which never had before.  And it’s a question about mail.  Because the wizarding world is the opposite of the muggle world, in that they have instantaneous physical transportation (floo, apparition, portkey) but not instantaneous text-based communication (letters carried by owl).

What happens if an owl is bringing you a letter from London and you are, say, in Scotland, at Hogwarts, and the owl is almost there, and then you floo/apparate/portkey somewhere else.  Say, London.

Does the owl know and turn around mid-flight?  Would the owl then become very bad-tempered from the extra distance you made them fly?