Route · ONT → DEN · 2020–2025 BTS data
Ontario to Denver
The ONT–DEN corridor (Ontario, CA → Denver, CO) runs ahead of the national average, served by 12 carriers across roughly 819 miles.
Data updated 2026-06-13
- 84%
- On-time
- +5 pts
- vs US avg
- 72 min
- Delay when late
- 14,321
- Flights
Cancelled
0.7%
Best Month
Sep 2024 90%
Worst Month
Jul 2025 66%
Distance
819 mi
Carriers
12
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 195 | 44 | 0 | 1 | WN,F9,UA |
| Nov 2025 | 220 | 36 | 0 | 0 | UA,F9,WN |
| Oct 2025 | 241 | 33 | 2 | 0 | UA,WN,F9 |
| Sep 2025 | 237 | 45 | 0 | 0 | UA,WN,F9 |
| Aug 2025 | 254 | 66 | 1 | 2 | WN,F9,UA |
| Jul 2025 | 272 | 93 | 3 | 2 | UA,WN,F9 |
| Jun 2025 | 260 | 86 | 3 | 3 | UA,WN,F9 |
| May 2025 | 261 | 80 | 4 | 3 | OO,UA,WN,F9 |
| Apr 2025 | 252 | 57 | 1 | 1 | F9,OO,UA,WN |
| Mar 2025 | 213 | 30 | 0 | 1 | UA,WN,F9 |
| Feb 2025 | 187 | 22 | 0 | 0 | UA,WN,F9 |
| Jan 2025 | 208 | 41 | 2 | 0 | UA,WN,F9 |
| Dec 2024 | 223 | 24 | 0 | 0 | F9,UA,WN |
| Nov 2024 | 224 | 28 | 2 | 0 | UA,WN,F9 |
| Oct 2024 | 259 | 25 | 0 | 0 | UA,WN,F9 |
| Sep 2024 | 249 | 24 | 0 | 0 | WN,UA,F9 |
| Aug 2024 | 263 | 44 | 3 | 2 | F9,WN,UA |
| Jul 2024 | 273 | 46 | 6 | 1 | F9,UA,WN |
| Jun 2024 | 262 | 49 | 1 | 1 | F9,UA,WN |
| May 2024 | 247 | 39 | 1 | 0 | F9,OO,UA,WN |
| Apr 2024 | 228 | 29 | 1 | 0 | F9,UA,WN |
| Mar 2024 | 226 | 31 | 3 | 0 | F9,UA,WN |
| Feb 2024 | 219 | 40 | 2 | 0 | F9,UA,WN |
| Jan 2024 | 229 | 26 | 4 | 0 | F9,WN,UA |
Cancellation Rate
0.7%
39 of 5,702 flights
Diversion Rate
0.3%
17 of 5,702 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
Origin airport →DEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
Destination airport →Compare the two airports
See ONT and DEN side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to ONT–DEN.
Routes with a similar on-time rate
What the Data Says About ONT to DEN
Bureau of Transportation Statistics records show Ontario to Denver (ONT to DEN) running a 84% on-time rate over 14,321 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 72.2 minutes. The 819-mile corridor is served by 12 carriers, and over the last 24 months 0.7% of 5,702 flights were cancelled, 0.3% diverted.
The monthly split is wide on this route: Sep 2024 posted the strongest performance at 90% on-time, while Jul 2025 came in at just 66% - a 25-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from ONT to DEN? ▼
What is the cancellation rate for ONT to DEN? ▼
How far is the flight from ONT to DEN? ▼
When is the best time to fly from ONT to DEN? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.