what airlines fly into your airport

For most of the year it is just United coming out of Denver. In the winter time there are direct flights, daily flights from Dallas. And almost daily flights from Houston. For most of the summer we also have a daily flight from Houston. The Dallas flight is American and the Houston flight is United

Denver has direct flight on United express

I believe United. No direct flights unless you are coming from just 2 states and I don't recall which two offer nonstop flights