on holiday BrE
on vacation AmE *

They said they'd wait until he had started on his vacation.

The summer is a time when young people are away on vacation.

You guys are going on vacation in a couple weeks?

When you go on vacation, look for ways to learn about America.

You can go on vacation for weeks when children are off from school.

Away on vacation and looking for something good to read?

"Everybody would love to drive a big car on vacation, but they want to pay for a small one."

And they should include the kids, because even a 4- or 5-year-old can have a say about what they'd like to do on vacation.

Now I find out he's going to be on vacation.

I like to look good even when I'm on vacation.