i2fantsiz4,
how much time do you have in BKK? I did an open jaws reward ticket on CO about this time last year, and purchased a one way ticket on PR for under $200 all in with a three day advance purchase. There are bucket shops all over BKK, so it should not be hard. In fact, IIRC RT was well under $400, and probably under $300, but of course that was a year ago. The PR flight had a special fare for citizens of PI, but of course that leaves most of us out.
Couple of point though: I've read that you may be asked to provide proof of return journey from LOS, though I never was in several trips. And while you may be nervous about going to a country with no way out unless you find a decently priced ticket there, I did it on my maiden voyage to Asia (can't say it wasn't in the back of my mind though

).
EmailKid