Related: How to add a redirect in Cloudflare (video needed).
- url: http://destination.com/* (the /* says all pages that start with http://destination.com)
- rules -> page rules and add a new rule
- Pick a Setting (required): Forwarding URL
- Status Code: 301 Permanent
- Destination: www.destination.com/$ ($the /$ matches the /* above so no matter what is entered after the slash, it will be matched on the destination)