Here is the URL i am using :

https://maps.googleapis.com/maps/api/directions/json?origin=28.6139,77.2090&destination=25.992003,-80.117802&key=API KEY

When i am hitting this URL in browser , i am getting following response :

{
   "geocoded_waypoints" : [ {}, {} ],
   "routes" : [],
   "status" : "ZERO_RESULTS"
}

Source location is delhi and destination location is 3555 N Ocean Dr, Hollywood, FL 33019, USA . If i change the destination location to any other then i am getting values for geocoded waypoints but why not for above values?

Help is deeply appreciated.

I think your error is caused by travel modes restriction in Direction API.

Travel Modes

When you calculate directions, you may specify the transportation mode to use. By default, directions are calculated as driving directions. The following travel modes are supported:

• driving (default) indicates standard driving directions using the road network.
• walking requests walking directions via pedestrian paths & sidewalks (where available).
• bicycling requests bicycling directions via bicycle paths & preferred streets (where available).
• transit requests directions via public transit routes (where available). If you set the mode to transit, you can optionally specify either a departure_time or an arrival_time. If neither time is specified, the departure_time defaults to now (that is, the departure time defaults to the current time). You can also optionally include a transit_mode and/or a transit_routing_preference.

Sample Route in Google Maps App(Browser)

https://www.google.com.ph/maps/dir/28.6139,77.209/'25.992003,-80.117802'/@22.2476068,-39.0397189,4z/data=!3m1!4b1!4m6!4m5!1m0!1m3!2m2!1d-80.117802!2d25.992003

If you will check that link in your browser, the travel mode is flight which is not available in the Direction API.

Here is a previous question : How to set travel mode to “Flight” in google map direction API

Hope this helps.