Route · DEN → ONT · 2020–2025 BTS data
Denver to Ontario
The DEN–ONT corridor (Denver, CO → Ontario, CA) runs behind the national average, served by 13 carriers across roughly 819 miles.
Data updated 2026-06-13
- 75.1%
- On-time
- -3.9 pts
- vs US avg
- 58 min
- Delay when late
- 14,378
- Flights
Cancelled
0.6%
Best Month
Oct 2024 89%
Worst Month
Jul 2025 59%
Distance
819 mi
Carriers
13
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 194 | 60 | 0 | 0 | WN,F9,UA |
| Nov 2025 | 220 | 36 | 1 | 0 | UA,F9,WN |
| Oct 2025 | 242 | 63 | 1 | 0 | UA,WN,F9 |
| Sep 2025 | 236 | 57 | 0 | 0 | UA,WN,F9 |
| Aug 2025 | 254 | 74 | 0 | 0 | WN,F9,UA |
| Jul 2025 | 272 | 112 | 2 | 0 | UA,WN,F9 |
| Jun 2025 | 261 | 104 | 4 | 0 | UA,WN,F9 |
| May 2025 | 260 | 66 | 4 | 0 | OO,UA,WN,F9 |
| Apr 2025 | 252 | 59 | 4 | 0 | F9,OO,UA,WN |
| Mar 2025 | 217 | 38 | 0 | 0 | UA,WN,F9 |
| Feb 2025 | 187 | 46 | 0 | 0 | UA,WN,F9 |
| Jan 2025 | 209 | 48 | 1 | 4 | UA,WN,F9 |
| Dec 2024 | 223 | 32 | 0 | 0 | F9,UA,WN |
| Nov 2024 | 224 | 56 | 1 | 1 | UA,WN,F9 |
| Oct 2024 | 259 | 28 | 0 | 0 | UA,WN,F9 |
| Sep 2024 | 249 | 47 | 0 | 0 | WN,UA,F9 |
| Aug 2024 | 263 | 75 | 1 | 0 | F9,WN,UA |
| Jul 2024 | 273 | 75 | 4 | 0 | F9,UA,WN |
| Jun 2024 | 264 | 87 | 1 | 0 | F9,UA,WN |
| May 2024 | 247 | 68 | 0 | 0 | F9,UA,WN |
| Apr 2024 | 232 | 42 | 0 | 0 | F9,UA,WN |
| Mar 2024 | 237 | 54 | 4 | 0 | F9,UA,WN |
| Feb 2024 | 219 | 61 | 1 | 0 | F9,UA,WN |
| Jan 2024 | 229 | 59 | 3 | 0 | F9,WN,UA |
Cancellation Rate
0.6%
32 of 5,723 flights
Diversion Rate
0.1%
5 of 5,723 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
DEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
Origin airport →ONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
Destination airport →Compare the two airports
See DEN and ONT side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to DEN–ONT.
Routes with a similar on-time rate
What the Data Says About DEN to ONT
The Denver to Ontario corridor (DEN to ONT) posts a 75.1% on-time rate on the lower edge of the average band, based on 14,378 tracked flights. Late flights run 58.2 minutes behind on average. 13 carriers cover the 819-mile route; over the last 24 months, 32 of 5,723 flights were cancelled (0.6%) and 0.1% diverted.
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 89% on-time, while Jul 2025 came in at just 59% - a 30-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.