Sorry, no inside knowledge on this route. I’d start with the old faithful resources — ITA, Kayak, Cfares, Flights, Mobissimo, Fly, Momondo, etc.

Also consider 2 tickets if you find a discount airline going from another airport that is cheap enough to make it worthwhile. From Hong Kong, Seoul, or Bangkok, for example (just guessing). Skyscanner shows low-cost service from Singapore, Malaysia, and Thailand; I didn’t click through to see which airports, but assuming SIN, KUL, and BKK. So if a consolidator has a good offer to one of those, consider a 1-2 day stopover, then onward with Air Asia X, Jetstar, etc. — could be a way to get 2 trips out of this, and still save on the airfare. But if that doesn’t interest you, then Flights or other consolidators might have a decent offer without any of these hassles.

Thanks for the info.