Both American and United Airlines have roundtrip airfares to and from Chicago (ORD) and Miami (MIA) for $98 including taxes/fees. You may or may not have to purchase two separate one-way fares for two different airlines to achieve the $134 price. It is possible to get this on the same airline. And on United, it is your basic economy fare. See below for basic economy info. This is a nonstop flight.
Departs ORD: Aug 23; Sept 5, 13, 23; Jan 16, 17, 20, 23, 27, 31; Feb 6
Departs MIA: Sept 20; Jan 24, 27; Feb 3
Dates fluctuating but if you can't find what you are looking for, try for a Tues, Wed or Sat departure. Use dates and book it on Expedia [expedia.com]
, Priceline [priceline.com]
, Orbitz [orbitz.com]
, American Airlines [aa.com]
or United Airlines [united.com]
United's Basic Economy fare limits carry-on bags to one small personal item, such as a purse or laptop bag. All other baggage must be checked for a fee.
Sample for American attached as it is still an "economy' fare vs. basic economy. I'd grab it on AA.
link to recent travel deals