Yow have an interesting subject!
I guess the question is ---- why???
Did you want to visit both, or looking to save money? Or just
like being awkward? [

)]
Seriously there are lost of ways to get to Calis, and Rhodos for that matter, but the "why" can help identify routes etc.?
I actually nearly did that last year myself, fly to Rhodes, few days there, over the Fethiye and back the same way, in the end decided to go to istanbul for a week then to Calis -- brillinat but expensive!