Best Time to Fly DEN to ONT
Denver to Ontario — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
January
1% on time
Worst month
January
1% on time
DEN → ONT on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| January | 1% | 0% | 840 |
| February | 1% | 0% | 768 |
| March | 1% | 0% | 877 |
| April | 1% | 0% | 903 |
| May | 1% | 0% | 962 |
| June | 1% | 0% | 981 |
| July | 1% | 0% | 1,039 |
| August | 1% | 0% | 779 |
| September | 1% | 0% | 720 |
| October | 1% | 0% | 745 |
| November | 1% | 0% | 679 |
| December | 1% | 0% | 662 |
Frequently asked
What is the best month to fly from DEN to ONT?
January has the highest on-time rate at 1% for flights from Denver to Ontario.
What is the worst month to fly DEN to ONT?
January has the lowest on-time rate at 1%, often due to winter weather.
How often are DEN to ONT flights delayed?
On average, 1% of flights from DEN to ONT arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.