Having just spent the better part of Tuesday sitting in the Montreal airport because my connecting flight to Chicago was delayed, I for one am happy to hear that United Airlines is starting daily nonstop service from Chicago to Quebec City as of June 5.
The timing is good because this is an excellent year to visit this historic city. That's because it turns 400 this year and a bunch of activities and special events are planned to help in the celebration.
As for details of the flight, the Quebec airport says this:
The daily service will be operated by United Express partner Shuttle America with a 70-seat Embraer 170, equipped with Explus and Economy Plus. Explus provides customers with first class comfort and service on United Express regional jet service, and Economy Plus affords extra leg room at the front of the economy cabin.
“We are pleased to give our customers what they want – new, convenient non-stop service to more places in the U.S. and Canada,” says Kevin Knight, United’s senior vice president – Planning. “We welcome customers in Québec to United’s global network.”
Lori Rackl writes a weekly Travel section that runs Wednesdays in the 
Enjoyed your article on Quebec, one of my very favorite places in the
SUMMER. My son's in-laws live in suburban Quebec City and are very
gracious hosts to us.
If you have the chance to get back to Quebec in the summer take a beautiful
2 1/2 hour drive north along the river and take a whale watching trip on
the St. Lawrence. Even if you don't see any whales the drive up is worth
it. Several great stops along the way, including the Chateau Richelua
(sp?). Similar to the Chateau Frontenac in a beautiful setting.
Glad you enjoyed QC.