Your train # 28 junctions with #8 at Spokane #8 is the EB Origin Seattle and final destination Chicago.
You are smart to watch the timing on this thrice weekly trip.
Train #8 is notoriously late. Either the #28 or #8 leaves on time from the Pacific coast but by the time
is gets to the eastern end of Montana and starts across North Dakota it can be as much as 4 hours late
AND then sometimes BNSF snafu lets the EB ride thru fairly timely.
Use this link for checking on Amtrak trains:
http://dixielandsoftware.net/cgi-bin/getmap.pl?mapname=West
Something you need to know the scheduled arrival in Chicago is 3:35 pm - Which airport is your planned Flight ?
O'Hara is about 18 some miles from Union Station - use the Blue Line
Midway is about 10 some miles from U.S. - use the Orange Line
Map for reference:
https://www.google.com/maps/@41.8962509,-87.8015217,12z
With the covid 19 virus the flights are drastically restricted in numbers and passengers so getting thru security upon arrival at the airport
is not a significant problem (it is ordinarily at Midway all the airlines use the same common TSA check Point
unlike O'Hara where each airline and terminal has an individual check point - and it does help to have TSA
Pre-Check or Global Entry or First Class Frequent Flyer Airline affinity) !
Getting back to that arrival at Chicago Union Station the Orange and Blue line Metro take a bit of
walking to connect to - think about 15 minutes for the blue and perhaps 20 for the orange.
Blue a 3-4 block walk and the Orange 5-6 crossing the Chicago River.
Time being of essence take a cab I don't have a fare quote - but it is not going to be cheap.
Early evening flights are a real problem connection to with that 3:35pm (on time) arrival -
Dream the impossible dream and go fight some windmills Don Quixote been there and done that !!!!!
Flights after 8 or 9 pm are more in the ball park - but even then #$&% !
You probably have a need to transit to Chicago for business a visit or something else -
if not would offer an alternative solution to get off the EB in St. Paul and fly to where ever from there.
Have rode the Friends of the 261 cars back and forth many times between Minneapolis/St Paul to Chicago
and am well versed in the pit falls of a late train #8 (#28) - train #7 (#27) westbound is not a problem.
The 261 Friends add cars to the EB consist to position for contracted charters for clients at Chicago or other points.
Sadly that is on a hiatus status for the present.
Any questions - give a reply back - - - - -