By plane

Unless you happen to be coming here from the islands of Kihnu or Ruhnu, it's doubtful that you'll be arriving in by air. That said, it's theoretically possible to charter a plane from Tallinn. Pärnu's airport, originally built as a military airbase, is now head-quartered in a compact and modern building, and has only minimal services.
Getting to town Bus N°23 synchronises with all incoming flights and can be found waiting at the front of the terminal. See Getting Around section for taxi information.