The Train Between Chicago and Milwaukee
Amtrak runs the Hiawatha service on this route and it's the only real option if you want rail instead of driving. The trip takes about 1 hour 40 minutes door to door if you count getting to the station and waiting. One stop between the two cities at Milwaukee Intermodal Station, which is downtown near the lakefront. Frequency is roughly every two hours during the day, though late evening schedules thin out pretty fast. Booking is straightforward through Amtrak's website or app. Standard coach runs about $40 to $60 one way depending on when you buy it. The Hiawatha doesn't require a reservation in most cases, which is unusual for Amtrak and makes it feel more like a commuter train. You can walk up and buy a ticket, though you'll pay a premium and risk standing if the car fills up. Boarding happens at Chicago Union Station on the southwest side of downtown, level two. The platform is accessible from the street via stairs or elevator. I always arrive 25 minutes before departure because the ticket gate closes at the announced time, not ten minutes before like some people assume. There's a coffee shop inside the station, but the selection is limited and overpriced. Better to bring your own water.
The train itself is a Bombardier bi-level coach with business class and standard seating. Business class has more legroom and complimentary coffee. Standard seating is perfectly fine for a sub-two-hour ride. The lobbies have outlets and the Wi-Fi works well enough for checking email, though streaming anything video-related will buffer. Power outlets are at every other seat in standard, so you might have to scoot over if the person next to you is charging a laptop. Baggage allowance is one carry-on and one personal item for free. Checked bags aren't available on the Hiawatha route. If you're traveling with ski equipment or oversize gear, plan differently. There's a bike storage area at the front of the train that holds four bicycles per car on a first-come basis. I've seen people leave their bikes at home because they assumed the space was full, so calling ahead or arriving early for bike transport is worth the effort. Here's something most guide sites won't tell you: the southbound platform at Union Station is on the lower level and the stairs down are narrow and crowded during rush hour. If you're heading to Milwaukee in the morning, take the escalator if it's running rather than the stairs. It's faster and you won't end up stuck behind a slow group of tourists figuring out which way the handrail goes. I learned this the hard way on a Tuesday in March when I was already ten minutes early and still made it to the gate with about two minutes to spare.
At Milwaukee, the train pulls into the Intermodal Station, which is connected to the city bus system and the Milwaukee County Transit System. From there you can grab a bus downtown or a taxi to the lakefront area. The station is about a half-mile from major downtown hotels. Walking is doable in good weather, but January in Milwaukee is not the time for that adventure. There are actual downsides worth being honest about. The Hiawatha is reliable but not perfect. Delay reports average around 15 minutes per trip due to freight train interference, which is a known issue on this corridor. Canadian National Railroad owns the track and freight traffic sometimes makes Amtrak wait in sidings. If you have a connecting flight or a tight meeting at the other end, build in a buffer. The schedule shows 1:40, but the real-world arrival is closer to 1:55 on a bad day. Another practical issue is the frequency gap. Late afternoon departures around 5 to 7 PM are sparse, and the last southbound train leaves Chicago around 8:30 PM. If you miss it, you're driving or booking a rideshare. I spent a night in a Milwaukee hotel once because I misread the schedule and assumed the 9 PM trip existed. It doesn't. The schedule looked different five years ago, so double-check before you rely on it.
Get the Full Details

For anyone who wants the full breakdown, searching for The Ultimate Guide To Traveling From Chicago To Milwaukee By Train A Comprehensive Overview will surface the official Amtrak page with current schedules, fare breakdowns, and accessibility information. The schedule changes seasonally, so what was true in June might be slightly different in November. Always verify before you go. Overall, the train works if your expectations match reality. It's not luxury travel. It's not a scenic route either, since most of the track runs through industrial areas and suburbia anyway. But it's reliable enough for a weekday commute, cheaper than parking at the airport and flying, and you actually get to read a book or work instead of staring at brake lights on I-94. That alone makes it worth considering for most trips between these two cities.