It is kind of confusing. $2 for bus, $2.25 for rail. Then there's a +$0.25 transfer fee for the first transfer on an active fare. So bus-bus, rail-rail, and rail-bus transfers are $0.25, while bus-rail transfers are $0.50. Then of course there are places where you can transfer for free between rail lines (some marked on the L maps, some not marked) by avoiding turnstyles, and then a few more places where the turnstyles don't charge you a transfer fee if you have an active rail fare. Of course, buses give neither change nor paper transfers, so if your farecard doesn't have enough value on it and you're making a trip with transfers, you're pretty screwed. Aaaand, it now costs $5 to board at Ohare.Having tried to ride a city bus in Chicago I can say that it wasn't a very pleasant experience. First, I had no idea how much the fare was. Chicago has something confusing where bus fares are lower than subway fares but you have to pay to transfer and ??? I had a swipe card for the El but it only had $1.75 so I just dropped $3 into the machine and walked to the back of the bus with my friend because it was cold and I wanted to get back to my hotel.
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But at least CTA doesn't bother with rush-period or express fares.