How much does it cost to get up to the top?

I believe it's between $30-35 per ticket, and more if you get the day/night ticket. Check out City Pass for deals on combined excursions, like the Space Needle, Harbor Cruise and the aquarium. The deals are better.

We used CityPass. $99 and it got you into 5 of the major attractions! Plus other discounts. The Space Needle also lets you come back at night. So a day n night visit!