Mykonos to Kos - how?
 

I will have roughly 4 to 5 days available this September to travel from Mykonos to Kos.

I want to do it by ferry without having to go through Pireaus but I can't seem to find a suitable route.

Any suggestions?

You'll first need to go from Mykonos to either Santorini or Syros depending on the day you want to go to Kos. Blue Star Ferries operates ferries to Kos that stop at either island.

http://www.gtp.gr