Fly to Dubrovnik - it is the easiest way.
Airport is just 25 km far away from Dubrovnik town and it can be easily reach.
By local taxi (cca 35 euros in one way), or by local bus operating from airport to bus station.

You can come to Dubrovnik by ferry also, or by bus, by car...
Car hire avaiable at www.e-sixt.com.

It matters not which way you choose to come to Dubrovnik, by sea, by road or by air, one thing is certain:
you will want to return here again, and again!