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This question already has an answer here:

Sometime faces have vertices that not aligned in one plane. For example if I have this (face should be flat here):

enter image description here

It rather should be like that:

enter image description here

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marked as duplicate by Duarte Farrajota Ramos, Mr Zak, Paul Gonet, David May 31 '17 at 19:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Couple of ways you could do this:

Method 1

  • Select your face
  • Change the 'Transform Orientation' to 'Normal' enter image description here
  • Hit 'S' to scale
  • Double-hit 'Z' to scale along the face's normal
  • Type 0
  • Hit enter

Method 2

  • Add a new plane (single face)

  • Rotate it as desired to define your belonged normal axis

  • Again change your Transformation Orientation to Normal

  • Create your custom orientation in the right-3dview-panel enter image description here

  • Rename it and use it in the same way as 'Method 1'

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  • $\begingroup$ The only problem with these methods is they don't produce the even/regular planes. $\endgroup$ – Paul Gonet May 31 '17 at 21:20
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If you want to make it flat horizontally set the 3D cursor as a pivot point, select the vertex which is lying on a grid floor and snap the cursor to it (Shift+S-->Cursor to Selected) .Then select the non aligned one and press S,Z,0.
enter image description here

If you want do it like in your second picture duplicate the non alligned edge in Edit Mode and snap it to the opposite part of a plane (click the magnet icon, snap element type- Vertex), then merge the vertices as pictured below (Alt+M-->At Last). Finally select the whole mesh and remove doubles (W-->Remove Doubles).
enter image description here

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