I hope I'm at the right place.

I have an important business trip to Seoul coming up, and am trying to decide on flights. The cheapest is United, through SFO, but there's only an hour layover, which makes me nervous. I have a day buffer, but still, I want to be safe about getting there on time.

Another $450 gets me AA through DFW, again with a one hour layover, or Delta through SEA (1h13m). Even more $$ gets Japan Air.

Is one hour enough? I'll probably be checking a bag. I'd probably trust AA over United these days, especially to not delay (SFO worse than DFW).

Any advice?

Any tips?