| name | Hub | image | date Ceased operations | date Commenced operations | IATA Code | ICAO Code | city Headquarters | administrative division Headquarters | country Headquarters | continent Headquarters | Country | continent | Parent | number of aircrafts | number of destinations | Website |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Boutique Air | Denver International Airport | 2007 | 4B | BTQ | San Francisco | California | United States | Americas | United States | Americas | Boutique Air | 19 | 25 | Website | ||
| Great Lakes Airlines | Denver International Airport |  | 1977 | ZK | GLA | Cheyenne, Wyoming | Wyoming | United States | Americas | United States | Americas | Great Lakes Airlines | 28 | 30 | Website | |
| Frontier Airlines | Denver International Airport |  | 05/07/1994 | F9 | FFT | Denver | Colorado | United States | Americas | United States | Americas | Republic Airways Holdings | 65 | 65 | Website | |
| Ted (airline) | Denver International Airport | 06/01/2009 | 12/02/2004 | UA | UAL | Denver | Colorado | United States | Americas | United States | Americas | UAL Corporation | 55 | 22 | Website | |
| Lynx Aviation | Denver International Airport | 2011 | 2006 | Denver | Colorado | United States | Americas | Republic Airways Holdings | 4 | 4 | Website |