I'm trying to book some flights for a meeting in Kansas City, MO. The last United flight from MCI to ORD leaves at 5:50pm on that day -- anybody have a feel for possible security delays around that time?

Never been to KC before. Yahoo Maps says it will take 34 minutes to get to MCI from the Westwood area and I probably won't be able to bust out of the meeting until 4:30pm, so between rush-hour traffic and other inevitable delays, I'm wondering if I shouldn't just escape to the dAArkside for this one and book American's 7:09pm departure (it's only 407 miles, after all).

Anyway, thanks in advance to the MCI experts out there.