Average velocity and average speed is same for:
For average velocity and average speed to be same, distance and displacement of the body should be same for the same time interval.
A car making a round trip on a circular track, its displacement will be 0 whereas it will have some non-zero distance.
On a straight road, distance and displacement are same as long as the object never returns back and always moves in the same direction.
For a flight travelling between Delhi to Kolkata, its value of distance is more than the displacement because of the elevation it covers.
For the car going on a zig-zag road, the distance is more than the displacement.