Originally Posted by
mherdeg
A few options:
(1) Take Amtrak; CHI-SPI has a scheduled service 7 p.m.–10:24 p.m. This is a $54 train ticket on today's service. United probably won't buy a ticket for you. You gotta get to Chicago Union Station by 7 p.m. There is one earlier train but you probably won't make the earlier 5:15 p.m. departure.
Not a chance of the 5:15 at this point, but the 7:00 is still very doable if you hustle.
I wouldn't do a cab this time of day - take the Blue line from ORD and get off at Jackson, from there it will be a 10 minute walk west to Union Station. You could be there as early as 6:00 or 6:15 if you start now.