Looking on the internet deeply has found these results:

on vacations is the most popular phrase on the web.

in vacations 11,040,000 results on the web	on vacations 17,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
In the 1999 performance in Vacations on the snow and Y Those who look for a better shopping environment, go to the shopping center and malls, which in vacations season open until 11:00 PM. Which is a quality I happen to really like in vacations. Musty smell of little lived In vacations, I worked in a steel mill and in an automobile factory. sea, beach and coconuts. Pépère is out in vacations for a week and arrive right now. But I think in vacations I'm a much hungry person! in vacation homes.	It's just happy people on vacations. Instead of splurging on vacations, he shows me documentaries about different lands. Saving on vacations is possible and doesn't mean having to do without quality service. Robots don't go on vacations. As you know, people go on vacations all the time. Easily carry your lunch to work or your camera on vacations in one of the convenient zipper compartments. People don't go on vacations with babies. Make it autumn colors and take it to classes or on vacations.

in vacations

11,040,000 results on the web

on vacations

17,000,000 results on the web

More popular!

In the 1999 performance in Vacations on the snow and Y
Those who look for a better shopping environment, go to the shopping center and malls, which in vacations season open until 11:00 PM.
Which is a quality I happen to really like in vacations.
Musty smell of little lived
In vacations, I worked in a steel mill and in an automobile factory.
sea, beach and coconuts. Pépère is out in vacations for a week and arrive right now.
But I think in vacations I'm a much hungry person!
in vacation homes.

It's just happy people on vacations.
Instead of splurging on vacations, he shows me documentaries about different lands.
Saving on vacations is possible and doesn't mean having to do without quality service.
Robots don't go on vacations.
As you know, people go on vacations all the time.
Easily carry your lunch to work or your camera on vacations in one of the convenient zipper compartments.
People don't go on vacations with babies.
Make it autumn colors and take it to classes or on vacations.