It costs about USD 280 for one way. If you know the dates you are travelling and they are quiet far from the date of your reservation, you can have tickets for USD 40 one way from Zurich. Geneva to Zurich is an other story.
Ludwik Dembinski has written: 'International Geneva Yearbook, 1990:Vol. IV:Organization and Activities of International Institutions in Geneva (International Geneva Yearbook)' 'International Geneva Yearbook, 1989 (International Geneva Yearbook)'
No, Geneva is not a capitol (which is a type of building), or a national capital. Geneva is the capital of the canton (state) of Geneva. The capital of Switzerland is Bern. This answer is predicated on the assumption that the question refers to Switzerland.