You May Even Find a Baby in Your Hotel Room

This August and September, the cheapest flights to Las Vegas from Chicago cost $259, and are direct flights on US Airways.

In September especially, the cheapest flights are on Mondays, Tuesdays, and Wednesdays, with an occasional cheap flight on Saturdays as well.

Weekend flights to Las Vegas from Chicago typically costs closer to 300 hundred dollars, but you should be able to find flights for just under that.