The cheapest way would be flying/buying coach to the West Coast on a seperate ticket, and then buying a one-way to BKK. They can be had for around $1500, and then the return from BKK will run you about $1000. A lot of discussion about these types of fares can be found
here.
Originally Posted by francophile
China Airlines full fare C class fare is $4,340/$5,200. You can use the AMEX platinum program on China Airlines.
Would someone be so kind to provide a bit more information about BOGO? Might be interesting if it worked from places like BKK. Thanks!