You can migrate straight to ColdFusion 2018, you don't have to migrate to ColdFusion 2016 first.
Are you asking specifically about whether a CF11 license can be upgraded directly to CF2018? If so, see this ColdFusion Portal blog post and comments: https://coldfusion.adobe.com/2018/05/upgrade-path-to-coldfusion-2018-release/
Priyank - were you talking about code migration or license upgrade?
I was asking about code migration, not licenses.
I was referring to code migration from ColdFusion 11 to ColdFusion 2018.