Overwatch: Echo Superglide (How To). Hoshizora has a neat video showcasing Echo and how she can superglide vast distances utilising a little trick with her flight.

By default, pressing Shift propels you forwards. This gives you around 3 seconds of movement speed, and flight mobility. It can allow you to travel some distance, but not lots. 

Gliding huge distances makes use (or abuse) of the speed boost you gain when pressing Shift, but also cancelling it at the right time. Simply:

Jump (Hold) + Shift + Cancel Shift

Performing this in quick succession results in the below. Enjoy!