There are a number of charter airplanes in Nazca. You can arrange a flight on the spot, by making arrangements and bargaining on the price with a pilot at the airfield. You can also take a tour from Lima which brings you by bus to the town, and then takes you up. This is about an eight-hour bus trip, so you'll leave very early, arrive in time for lunch and take an afternoon flight. If you don't want to go by bus, you can take an AeroCondor flight from Lima or Ica, 86 mi (141 km) to the north.
However you arrive in Nazca, be prepared for a short, bumpy ride, lasting up to forty-five minutes, over the lines. Turns can be tight, so if you are squeamish or subject to airsickness, you might want to think twice, or plan to stay overnight in Nazca for an early morning flight when the air is a bit calmer. The pilots will take you up, level off around 900 ft (300 m), circle around a figure allowing plenty of camera time, then move on to the next.