I think that makes the most sense...the new SQ A350 flight from SFO.

Especially if you want to stay on SQ metal to get their miles discount. If that doesn't matter you might consider routes via NRT/BKK on partners.

Depending on when you plan to go, be aware that CMB is closing to daytime flights for a few months for runway repairs early next year. So that may effect seat availability. But it seems that most longhauls operate late at night there anyway for some reason