Originally Posted by
SpannerSpinner
Assuming you mean to travel in the next couple of months, it's Northern hemisphere winter, so the sun is south of the equator. You are flying east, roughly 35 degrees north of the equator so the sun will be on your right the entire journey.
Some eastbound tpacs (e.g. PEK-ORD/NYC/BOS/WAS/YYZ) use polar routes, in which the sun can be on the left for a few hours as you head south over Canada.