How can I get to shedd aquarium from Chicago union station?

U can go in bus

You can take bus from clinton and quincy just 3 min from union station by walk. But it will take atleast 30 min to shredd aquarium. If you are in hurry and dont mind to spend few more dollars than i suggest to take taxi(uber/lyft ). In 10$ you easily reach there in 15-20 min, if you take pool than you will save 3-4$ more.