The traffic can be wonderful or horrible. I picked wifey up at LAX one afternoon, it took me close to 3 hours from Rancho Cucamonga but taking her back it took but 90 minutes. I usually plan for 2:15 for this 66 mile drive.
BTW, American Airlines has more doubled their fares out of ONT recently. You can fly RT to DFW from ONT for $560 vs. $260 into LAX. In February, I had a $240 RT from ONT. Me thinks days of cheap fares out of the LA satellite airports are done...at least for a while.
