Unfortunately the 8:15pm ORD-PHL departure is the last of the day (using today's schedules). Since you are getting in at about 6pm, I'm assuming this is your flight.

That makes it all the more imperative that you get off the plane and through all the obstacles.

Where are you sitting on the plane? Way way back in coach of a full flight will add to the deplaning time (and your frustrations).

The only 'good' part of this situation is that your international flight will probably arrive on time (or early) as you will have lots of hours in the air to make up time. The PHL flight might be late after a long day of delays in Chicago ... that could be your saving grace!

Personally I like closer to two hours to deplane, immigration, luggage, recheck (with TSA hastles), travel to terminal, security and run to gate.

Will your bags make it? I would not plan on it.

Will YOU make the flight?? 50/50!