Thanks for the tips, all, wow, so many responses!

I tried on orbitz, and found the $250 fare YYZ-YUL-YVR-SFO, but when I tried to add YOW, YYC, and DEN, the price shot up. I'll try again,

I'm looking in mid-november, there are lots of $250 (US) or so fares around that time.

Expedia seems to be limited to 5 segments, and travelocity to 4, is there any way to get them to give me more segments?

Last question, for the $250 fare above, orbitz said the fare basis was "LV something STP" - does this mean fare class "L", aka Tango Plus, aka eligible for 100% EQM (I'm a UA MP member)

Thanks.