Looking on the internet deeply has found these results:

Where are you going is the most popular phrase on the web.

where are you heading 111,000 results on the web	Where are you going 127,200,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Where Are You Heading? WHERE ARE YOU HEADING? By Rodney W. Francis. Can you give an honest answer to this question? You know your life is headed�... the formation of your question 'Where are you heading?' sounds a bit unnatural to me and never heard of it before. Because when�... Oct 26, 2014 ... First of All Greetings Emotion: smile. I presume, they are grammatically correct but where are you heading. Where are you headed doesn't make sense because it means�... Mar 5, 2009 ... For example, Max sees Sam walking by and asks, "Where are you heading?" because Sam is on the move, moving towards a destination.	Where are you going with your serious charge? Where are you going in that monkey suit? Where are you going, Zaki Pasha? Where are you going, my friend? Where are you going, old sleazebag! screaming like a madman... Where are you going, corporal? Where are you going, you little rascal? Where are you going, you blasted dog?

where are you heading

111,000 results on the web

Where are you going

127,200,000 results on the web

More popular!

Where Are You Heading? WHERE ARE YOU HEADING? By Rodney W. Francis. Can you give an honest answer to this question? You know your life is headed�...
the formation of your question 'Where are you heading?' sounds a bit unnatural to me and never heard of it before. Because when�...
Oct 26, 2014 ... First of All
Greetings Emotion: smile. I presume, they are grammatically correct but where are you heading. Where are you headed doesn't make sense because it means�...
Mar 5, 2009 ... For example, Max sees Sam walking by and asks, "Where are you heading?" because Sam is on the move, moving towards a destination.