Cheapest Transfer from O'Hare to Midway?

What would be the cheapest way to get from O'Hare to Midway Airport? Taxi, Train, Airport Shuttle? I have 4 hours in between my flights so I should have plenty of time. I arrive on a sat evening also so I know traffic will be an issue. Also please explain in detail any advice that you give. Ive never been... show more What would be the cheapest way to get from O'Hare to Midway Airport? Taxi, Train, Airport Shuttle? I have 4 hours in between my flights so I should have plenty of time. I arrive on a sat evening also so I know traffic will be an issue. Also please explain in detail any advice that you give. Ive never been outside of the ORD airport before. Thank you!
6 answers 6