Looking on the internet deeply has found these results:

where are they going is the most popular phrase on the web.

where will they going 18 results on the web	where are they going 1474,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Man, I wonder where they going. That's what he said, man... they going up. They going to come to the hotel room. Where are they going with this? You know where they going... to the bathroom. What they going there for?	Where have they come from? Where are they going? They said, where are people going to find the morality, where are they going to find guidance, and where are they going to find sources of consolation? So where are they going with fishing poles? Where are they going with those scones? DiNozzo, David... where are they going? Where are they going to get all the wax? Where are they going into the far recesses of the ship? Where are they going at this hour?

where will they going

18 results on the web

where are they going

1474,000 results on the web

More popular!

Where have they come from? Where are they going?
They said, where are people going to find the morality, where are they going to find guidance, and where are they going to find sources of consolation?
So where are they going with fishing poles?
Where are they going with those scones?
DiNozzo, David... where are they going?
Where are they going to get all the wax?
Where are they going into the far recesses of the ship?
Where are they going at this hour?