Hi, was looking at flights to Bangkok for November and I see various transits (layovers) from Tokyo, Narita, Doha, Seoul, and Singapore.

The cheapest routes for me are transiting through Tokyo or Narita. Are these options possible as of current? If not, any other recommendations?

Thank you kindly for your help!

A bit of context. I will be flying from California (San Jose, San Francisco, Los Angeles or Oakland).