If you are using vue-router, you should use router.go(path) to navigate to any particular route. The router can be accessed from within a component using this.$router.
Otherwise, window.location.href="https://stackoverflow.com/questions/35664550/some url"; works fine for non single-page apps.
EDIT: router.go() changed in VueJS 2.0. You can use $router.push({ name: "yourroutename"}) or just router.push("yourroutename") now to redirect.
Documentation
Note: In controllers use: this.$router.push({ name: 'routename' })