Ontario International ⇄ Denver International ONT–DEN
Airlines flew 6,530 flights between Ontario International ONT in Ontario, CA and Denver International DEN in Denver, CO in the twelve months to July 2026, both directions together: 731,270 passengers in 922,508 seats, 79% of them filled, and 51,770,793 pounds of freight. 819 miles, about 107 minutes in the air, on 8 airlines: Southwest Airlines Co. (2,534), United Air Lines Inc. (1,644), Frontier Airlines Inc. (1,100), United Parcel Service (952) and 4 more. Planning to fly it yourself? The weather and winds along this route right now.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 493 |
| 2/25 | 474 |
| 3/25 | 525 |
| 4/25 | 595 |
| 5/25 | 605 |
| 6/25 | 603 |
| 7/25 | 642 |
| 8/25 | 614 |
| 9/25 | 577 |
| 10/25 | 599 |
| 11/25 | 571 |
| 12/25 | 570 |
| 1/26 | 481 |
| 2/26 | 442 |
| 3/26 | 488 |
| 4/26 | 497 |
| 5/26 | 554 |
| 6/26 | 570 |
| 7/26 | 567 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 52,724 |
| 2/25 | 45,586 |
| 3/25 | 55,468 |
| 4/25 | 62,397 |
| 5/25 | 67,858 |
| 6/25 | 72,836 |
| 7/25 | 77,389 |
| 8/25 | 69,249 |
| 9/25 | 62,769 |
| 10/25 | 67,622 |
| 11/25 | 61,081 |
| 12/25 | 53,937 |
| 1/26 | 49,573 |
| 2/26 | 46,143 |
| 3/26 | 54,754 |
| 4/26 | 57,963 |
| 5/26 | 66,077 |
| 6/26 | 72,374 |
| 7/26 | 69,728 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Southwest Airlines Co. WN | 2,534 | 337,657 | 79% | scheduled passenger service |
| United Air Lines Inc. UA | 1,644 | 219,141 | 81% | scheduled passenger service |
| Frontier Airlines Inc. F9 | 1,100 | 174,306 | 78% | scheduled passenger service |
| United Parcel Service 5X | 952 | 0 | scheduled cargo service | |
| Air Transport International 8C | 295 | 0 | charter cargo service | |
| Federal Express Corporation FX | 3 | 0 | scheduled cargo service | |
| American Airlines Inc. AA | 1 | 166 | 87% | scheduled passenger service |
| SkyWest Airlines Inc. OO | 1 | 0 | 0% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing 737-800 | 1,607 | 171 | 219,950 |
| Boeing B737 Max 800 | 1,326 | 174 | 185,275 |
| Boeing 767-300/300ER | 856 | 0 | 0 |
| Airbus Industrie A320-200n | 531 | 186 | 81,314 |
| Boeing 737-700/700LR/Max 7 | 495 | 139 | 56,113 |
| Airbus Industrie A321-200n | 391 | 225 | 65,138 |
| Airbus Industrie A320-100/200 | 321 | 157 | 37,837 |
| Boeing B737 Max 900 | 306 | 179 | 43,920 |
| Boeing 757-200 | 266 | 0 | 0 |
| Boeing 737-900ER | 128 | 179 | 16,889 |
| Airbus Industrie A321Neoxlr | 114 | 230 | 18,519 |
| Airbus Industrie A300-600/R/CF/RCF | 87 | 0 | 0 |
| Airbus Industrie A319 | 60 | 126 | 6,315 |
| McDonnell Douglas MD-11 | 41 | 0 | 0 |
| Embraer ERJ-175 | 1 | 76 | 0 |
ONT → DEN this direction alone · flown January 2025 to July 2026
3,239 flights of 3,026 scheduled, 357,932 passengers in 457,183 seats, 33,459,418 pounds of freight, 2,083,481 pounds of mail. Southwest Airlines Co. 1,261; United Air Lines Inc. 818; Frontier Airlines Inc. 550; United Parcel Service 384; Air Transport International 225; American Airlines Inc. 1.
DEN → ONT this direction alone · flown January 2025 to July 2026
3,291 flights of 3,213 scheduled, 373,338 passengers in 465,325 seats, 18,311,375 pounds of freight, 2,370,834 pounds of mail. Southwest Airlines Co. 1,273; United Air Lines Inc. 826; United Parcel Service 568; Frontier Airlines Inc. 550; Air Transport International 70; Federal Express Corporation 3; SkyWest Airlines Inc. 1.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: Ontario International ONT and Denver International DEN; all routes.