Whilst you can certainly use a hybrid for that distance, it is no accident that the majority of riders prefer a road bike:
- It is lighter
- It is faster
- The drop bars give you multiple hand holds for comfort
- The lower ride position gives less wind resistance
- Climbing and acceleration are easier
- Girlies can't resist a rider of road bikes
(OK the last point I made up

)
If you really only want flat bars, then there are flat bar road bikes out there.
I suggest you test ride both types before committing yourself.