Route
ONT → DEN
Ontario International Airport Denver International Airport
How punctual is this route?
- On-time arrivals
- 81.8%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 74 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,624
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 39%
- Air traffic control & airport 34%
- Airline (crew, maintenance, cleaning) 25%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 81.0% | 237 |
| October 2025 | 86.2% | 241 |
| November 2025 | 83.6% | 220 |
| December 2025 | 77.3% | 195 |
| January 2026 | 88.0% | 185 |
| February 2026 | 86.4% | 171 |
| March 2026 | 73.0% | 200 |
| April 2026 | 86.3% | 205 |
| May 2026 | 83.9% | 242 |
| June 2026 | 77.4% | 250 |
| July 2026 | 78.2% | 243 |
| August 2026 | 81.7% | 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 | 76.4% | 0.2% | 61 min |
| United Airlines | 797 | 87.1% | 0.4% | 89 min |
| Frontier Airlines | 558 | 86.5% | 0.7% | 105 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
F91500
10% late · 320 flights
-
UA2446
6% late · 303 flights
-
UA1263
19% late · 237 flights
-
F92908
20% late · 173 flights
-
UA1417
13% late · 83 flights
-
F91262
15% late · 65 flights
-
WN314
17% late · 64 flights
-
WN3144
3% late · 61 flights
-
WN3145
5% late · 60 flights
-
WN2310
5% late · 59 flights
-
WN113
10% late · 58 flights
-
WN1666
9% late · 58 flights
-
WN2220
14% late · 58 flights
-
WN3303
32% late · 57 flights
-
WN2611
19% late · 47 flights
-
WN3146
62% late · 43 flights
-
WN3236
60% late · 40 flights
-
UA368
8% late · 39 flights
-
UA1350
5% late · 37 flights
-
WN3147
75% late · 36 flights
-
WN4129
12% late · 33 flights
-
WN787
50% late · 33 flights
-
WN3653
47% late · 32 flights
-
WN2686
10% late · 31 flights
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