How much it will cost for one person like entrance ticket and elevator ticket ? Thank you

$26 ATM

There's also a kiosk just outside the entrance.

You can buy combined tickets at the machine

You can buy the citypass for 80$ which includes 5 places like Seattle Aquarium, Space Needle, cruise, pop museum

pay online for a slight discount

If you can afford it, by the package. That way you get to see all three places. Worth the price. there's usually a long wait at the Space Needle so you can go to the museum of pop, and the Glass Museum then go back to the Space Needle

Combo tickets available as well.