Looking on the internet deeply has found these results:

by accident is the most popular phrase on the web.

on accident 1191,000 results on the web	by accident 122,700,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
In the US, on accident is about 1–2% as common, on average, as by accident ( COCA). However, usage varies geographically; some regions use on accident ... As I understand it, the conclusion is based on the observation that in one usage inventory, “on accident” was most commonly observed in the ... Jun 22, 2007 ... What is the deal with the term on accident? I've always used by accident, but I've noticed a lot of pretty smart people . . . I've noticed them using ... Feb 19, 2013 ... Grammar Expert, Growing up my mother was adamant we use "by accident" and " on purpose" vice "on accident", which is quite common in my ...	Patients die every single day by accident. But I locked the door by accident. People usually have them by accident. A petition like this doesn't happen by accident. One of them will fly into a bullet by accident. And the pattern isn't there by accident. So neither of our victims were infected by accident. This one taken by accident, utterly useless...

on accident

1191,000 results on the web

by accident

122,700,000 results on the web

More popular!

In the US, on accident is about 1–2% as common, on average, as by accident ( COCA). However, usage varies geographically; some regions use on accident ...
As I understand it, the conclusion is based on the observation that in one usage inventory, “on accident” was most commonly observed in the ...
Jun 22, 2007 ... What is the deal with the term on accident? I've always used by accident, but I've noticed a lot of pretty smart people . . . I've noticed them using ...
Feb 19, 2013 ... Grammar Expert, Growing up my mother was adamant we use "by accident" and " on purpose" vice "on accident", which is quite common in my ...