Most rentals are located in Pigadia. When ordering a car in advance, you can arrange an airport pick-up.
We can recommend a nice local rental company with a discount for climbers. They will deliver the car to the airport at the agreed time. Use “climbingkarpathos” Promo Code for 10% discount. Full insurance included.
They helped us many times when we came to visit new climbing routes. Moreover, one of the climbing sectors in Finiki (‘United’ sector) was named for them.