Due, to San Diego stay home order due, that means airports going close as well?

No the airport is still open. I do believe however as it gets worse that they may consider it. So if you're out of town you better bring your butt home quick and they may even start to do some type of Cobra testing at the airport meaning they'll make sure that you're not sick when you land

You should be fine as far as I know no airports are shutting down but there are social distancing measures in place so bring a mask

Not that I know of. I haven't seen it on the news, and I think that would be big news. Check on their website, though.

I hope not have not arrived back to San Diego.

Nope