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Frontier Airlines, Inc. is a major American ultra low-cost airline headquartered in Denver, Colorado. It operates flights to over 120 destinations in the United States, Caribbean, Mexico and Central America, and employs more than 5,000 staff. The carrier is a publicly traded company and maintains bases at Denver International Airport, Orlando International Airport, and eleven other cities across the contiguous United States and Puerto Rico.
| Revenue(US$m) | Net profit(US$m) | Number ofemployees(FTE) | Number ofpassengers(m) | Passengerload factor(%) | Number ofaircraft | Notes/references | |
| 2010 | 1,317 | 9.3 | 83.6 | ||||
| 2011 | 1,662 | 10.6 | 87.1 | ||||
| 2012 | 1,433 | 17 | 10.3 | 88.8 | 55 | ||
| 2013 | 1,349 | 11 | 3,614 | 10.2 | 90.6 | 52 | |
| 2014 | 1,575 | 140 | 3,653 | 11.7 | 90.4 | 54 | |
| 2015 | 1,604 | 146 | 2,981 | 12.6 | 88.0 | 61 | |
| 2016 | 1,714 | 200 | 3,163 | 14.8 | 87.2 | 66 | |
| 2017 | 1,915 | 162 | 3,584 | 16.8 | 86.4 | 78 | |
| 2018 | 2,156 | 80 | 3,978 | 19.4 | 84.9 | 84 | |
| 2019 | 2,508 | 251 | 4,935 | 22.7 | 86.1 | 98 | |
| 2020 | 1,250 | −225 | 4,974 | 11.2 | 67.5 | 104 | |
| 2021 | 2,060 | −102 | 5,481 | 20.7 | 75.9 | 110 | |
| 2022 | 3,326 | −37 | 6,450 | 25.5 | 80.9 | 120 | |
| 2023 | 3,589 | −11 | 7,214 | 30.2 | 81.4 | 136 | |
| 2024 | 3,775 | 85 | 7,938 | 33.3 | 76.8 | 159 |
| Rank | Origin airport | Passengers | Annual change |
| 1 | Denver, Colorado | 4,094,998 | 09.9% |
| 2 | Orlando, Florida | 2,896,984 | 017.9% |
| 3 | Las Vegas, Nevada | 1,966,306 | 012.4% |
| 4 | Atlanta, Georgia | 1,886,718 | 03.8% |
| 5 | Philadelphia, Pennsylvania | 1,817,243 | 04.7% |
| 6 | Dallas/Fort Worth, Texas | 1,588,959 | 041.1% |
| 7 | Phoenix, Arizona | 1,427,720 | 011.5% |
| 8 | San Juan, Puerto Rico | 1,117,957 | 026.5% |
| 9 | Tampa, Florida | 1,046,444 | 03.2% |
| 10 | Cleveland, Ohio | 1,043,741 | 025.7% |
| Aircraft | In service | Orders | Passengers | Notes |
| Airbus A320-200 | 6 | — | 180 | To be retired in 2025. |
| Airbus A320neo | 82 | 12 | 186 | Deliveries until 2026. |
| Airbus A321-200 | 21 | — | 230 | To be retired by 2029. |
| Airbus A321neo | 57 | 151 | 240 | Deliveries until 2029. |
| Total | 166 | 163 | ||
| Aircraft | Total | Introduced | Retired | Replacement | Notes |
| Airbus A318-100[citation needed] | 11 | 2003 | 2013 | Airbus A320 family | Launch customer. |
| Airbus A319-100 | 53 | 2001 | 2021 | Airbus A320neo | |
| Boeing 737-200[citation needed] | 12 | 1994 | 2006 | Airbus A320 family | |
| Boeing 737-300[citation needed] | 19 | 1995 | 2005 | ||
| Bombardier CRJ200[citation needed] | 6 | 2004 | 2006 | Bombardier CRJ700 | Operated by Mesa Airlines. |
| Bombardier CRJ700 | 6 | 2004 | 2006 | De Havilland Canada Dash 8-400 | Operated by Horizon Air. |
| De Havilland Canada Dash 8-400[citation needed] | 11 | 2007 | 2012 | None | Operated by Lynx Aviation. |
| Embraer E170[citation needed] | 10 | 2010 | 2013 | Airbus A320 family | Operated by Republic Airways. |
| Embraer E190[citation needed] | 13 | 2010 | 2013 | Operated by Republic Airways. |