Last time I had to do SoCal to this area, I was able to get a reasonable Southwest flight from Ontario to BWI. I'm not sure where in SoCal you are, but that might be an option. Although they say to fly into Reagan, BWI is just a four-dollar, 35 minute commuter train away from Union Station in DC, and it's really easy to take the subway from Union station to Reagan, so you can still get the hotel shuttle.
Also, I'm taking the 12:17 pm Amtrak from Baltimore, and should be at Union station around 1, if anyone is headed in that way and wants to get food together. There's a lot more restaurants near union station than there are near Reagan airport.