Welcome to the community!
Whether you need data with a flip phone depends on how you intend on using the phone. If your intention is to use the phone strictly for voice calls and messages, then you probably won't need a plan with data. However, the Alcatel Go Flip, offered by Fido, is preloaded with web, email, and calendar apps so you can be productive when you're out and about (see here). Most of the currently available flip-phones would also have at least some basic internet and email functionality. Some phones might even allow some additional apps to be downloaded. If you wished to use those functions without Wifi, you would need to have a plan with data.
Hope this helps 😀