We always just take the el, but then again we don't have a car anymore. No car = No problems
Seriously though, unless you're running late I would definitely park offsite versus the airport long term lots.
Something else to consider, if you have more than two (I think) outstanding parking tickets, you will return home from vacay to find Chicago's finest have put a boot on your car! I know many folks that have returned home only to find they are stuck at O'Hare waiting for the Dept. of Revenue to come take the boot off. That's the Chicago way...![]()