FLUTTER | Right Align not working

Use Spacer which will get remaining space and will divide the widget equally

     Row(
        children: <Widget>[
          Text("Text 1", style: TextStyle(fontSize: 20),),
          Spacer(),
          Text("Text 2", style: TextStyle(fontSize: 20),),
          Spacer(),
          Text("Text 3", style: TextStyle(fontSize: 20),),
        ],
      ),

Output:

Use the mainAxisAlignment property in Row widget.

new Row(
    mainAxisAlignment: MainAxisAlignment.spaceBetween, 
    ...
)

Screenshot:

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You can also try Wrap like this:

Wrap(
  spacing: 50, // spacing between each of the widgets below
  children: <Widget>[
    Text("One"),
    Text("Two"),
    Text("Three"),
  ],
)