Valencia International Airport (Aeropuerto de Valencia), also known as Valencia-Manises Airport (Aeropuerto de Valencia-Manises), is located 8 km from the city Valencia.
How to get to the airport
By metro
The Estación de Aeropuerto metro station (part of fare zone C) is located on the lower level of the airport. The airport is connected to the center by two lines: the red line 3 (Aeroport-Rafelbunyol) and the green line 5 (Aeroport-Marítim Serrería). Tickets are sold in the terminal. With one or two transfers, you can reach almost any part of the city. Train intervals are 7-15 minutes. The trip takes about 20 minutes. If you are staying in Valencia itself, you will need a ticket for 3 zones (ABC) for €5.50.
By bus
The yellow bus No. 150 (MetroBus) runs every day except Sundays and holidays between Manises Airport and Valencia. It stops in the departure area T1. Buses run every 20-26 minutes. Travel time is about 30 minutes. You need a one-way bus ticket for €1.50. It can be purchased from the driver.
By taxi
You can use a taxi to take you directly from the airport to your hotel. This will cost from €20. The trip will take 20-30 minutes.
You can order a transfer here.
I wrote about public transportation in Valencia here.