Onto or On to

I'm Tonto and like pronto I'm onto a different subject.

Shin, "onto" probably better 'cause "He walked on to the bus" means he walked a certain distance to encounter the bus. We might say "He walked over to the bus," or "He got on the bus"

The sentence is a little awkward. It sounds more natural to say "he got on the bus." That said, I don't think either are strictly incorrect, but they do imply different things. "He walked onto the bus" suggests that "he walked onto (the steps/floor/surface of) the bus." It might be more accurate to say something like "he climbed (the steps) onto the bus." This is kind of picky but people don't typically walk onto things. They walk forward and backward, up down, and on things, but not really onto things. They jump, climb, and move onto things.

"Walked on" can be a phrasal verb that gives the impression of moving past something, material or abstract. In other words, "he walked on (from or past something) to the bus." I don't think that's what you were trying to say here though.

Agree. He walked 'on the bus' sounds like he were strolling on top of it.

On rethinking, this has to be confusing. "He got on the bus" is just fine. "He walked on the bus" indeed sounds like he were walking on the roof.

"On to" has the meaning of "proceed to."

"Onto" has the meaning of "on top of."

Infrablue gave the only accurate answer and he got a thumb down.

Alas Con you're probly right

I am certainly right.

Certainly Con you're probly right

In general people in English speaking countries don't "walk onto" buses. If the manner in which they get on the bus is important, they might step, jump or maybe even run onto a bus. If the manner is irrelevant, we get onto or get on a bus, or in the more formal language employed by British bus companies, we board a bus. For completeness I will add that at the end of the journey we get off the bus, descend from a bus or in bus company language we alight from a bus.

If you want a context in which the phrase 'on to' would be appropriate, how about this:

As I walked along the pavement (US: sidewalk) I saw some vehicles parked at the side of the road. I walked past three cars and a truck and on to a bus a short distance further on. Note that this does not convey any sense that I boarded the bus. merely that I arrived at its location.

Con you've made my entire month

We apply linguistics.
'Geezer got on a bus'
Thereon, he posed a semantic-conundrum.
What do you call a person who is outstanding in their specific field?

'Specialist'? A lady replied.
No.

'Expert'? Called out a lowly voice from the rear.
No.

'Master'? uttered the martial-artist.
No.

So - One word answer - What do we label a person who is outstanding in their particular field?

I will give you the answer on December 27th 2016.

It's only the 11th, a lot can happen in 20 days.

Con my lot is your lot

"On to" means to move to a location on the surface.
"Onto" means to show that the object is on the surface like on the top of the bus.

Another incorrect and misleading answer from Selectmytutor.

And nary a red ribbon in sight.

Ya but at least you didn't get voted down.