I had a tix from LAX-YYZ-LHR-YYZ-LAX, US$660 all in, will yield me about 12k status miles. I like the stopovers in this tix.
But I think the fuel surcharge is C$122 if you buy this tix now. ($19 transborder, $42 trans-ocean), so the tix overall is not really that cheap indeed.