There isn't a bus from Milwaukee that goes directly to SFGAm.
The best route I have been able to find so far lies mostly on Amtrak or MegaBus. Both leave from the Milwaukee train station and will arrive at Chicago Union Station. You can then take Metra's Milwaukee District North line to Libertyville. That station is about 6 miles from the park. You can catch a Pace bus to the park then. It will pick up at the train station (not sure if it's in the parking lot or just near it on Milwaukee Ave.) The Pace bus you're looking for is route 572. This will cost about $55 if you use Amtrak. It will be significantly cheaper if you use MegaBus since it can be booked for as little as $3.
I suppose if you take MegaBus, you can cause a disturbance on the bus and get thrown off right around SFGAm
Yikes..If I ever use a bus I'll head off to Rosemont where I can catch a bus directly to GA and back to Rosemont. It's only $3. $55 is ridiculous. You almost have a Gold flash pass with that.
Homer: Hey Lisa would you like a doughnut? Lisa: No thanks, do you have any fruit? Homer: This has purple in it. Purple is a fruit.
You cannot be serious. Who would do that route you just stated? That is insane.
I checked Greyhound and they will drive you from Milwaukee to Waukegan (which is the next town east of Gurnee) for $13 each way. You can catch a PACE bus from there which will take you to SFGAm.
"Somewhere in Texas, a village is missing their idiot. It can currently be found in Washington D.C."