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Try DTW-PHX-SJD, Detroit-Phoenix-Los Cabos via Northwest or America West. The fares are around $600 RT and the layovers are only about an hour. You will need this much time coming back in to get through customs in Phoenix.
Well, we traded our condo for one at Fiesta Americana in Cabo, so the packages are out. I'm seeing the best flights now from DTW/HOU/SJD (detroit to houston to Cabo). It seems like the most direct route.