Route
DEN → ONT
Denver International Airport Ontario International Airport
How punctual is this route?
- On-time arrivals
- 74.8%
- Less than 15 minutes late
- Cancelled
- 0.2%
- Of scheduled flights
- Average delay when late
- 62 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,623
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 55%
- Airline (crew, maintenance, cleaning) 35%
- Air traffic control & airport 9%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 75.8% | 236 |
| October 2025 | 73.9% | 242 |
| November 2025 | 83.6% | 220 |
| December 2025 | 69.1% | 194 |
| January 2026 | 82.7% | 185 |
| February 2026 | 82.5% | 171 |
| March 2026 | 83.0% | 200 |
| April 2026 | 81.5% | 205 |
| May 2026 | 74.4% | 242 |
| June 2026 | 55.8% | 250 |
| July 2026 | 72.8% | 243 |
| August 2026 | 69.0% | 235 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 1,269 | 69.5% | 0.2% | 56 min |
| United Airlines | 797 | 79.4% | 0.0% | 74 min |
| Frontier Airlines | 557 | 80.3% | 0.5% | 65 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA430
12% late · 364 flights
-
F91261
23% late · 270 flights
-
UA2028
31% late · 200 flights
-
F91499
25% late · 147 flights
-
F92907
8% late · 140 flights
-
WN2576
27% late · 94 flights
-
WN2571
30% late · 63 flights
-
WN1660
18% late · 61 flights
-
WN1663
65% late · 60 flights
-
WN1708
47% late · 58 flights
-
UA1574
38% late · 55 flights
-
WN4790
22% late · 55 flights
-
WN4942
11% late · 53 flights
-
WN2949
60% late · 43 flights
-
WN106
5% late · 42 flights
-
WN1968
10% late · 42 flights
-
WN533
20% late · 42 flights
-
UA1109
17% late · 36 flights
-
WN2578
44% late · 36 flights
-
WN4080
33% late · 36 flights
-
WN3787
9% late · 33 flights
-
WN981
33% late · 33 flights
-
UA450
6% late · 32 flights
-
WN1984
61% late · 31 flights
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