Best Time to Fly PDX to ONT
Portland 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
PDX → ONT on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| January | 1% | 0.1% | 210 |
| February | 1% | 0% | 150 |
| March | 1% | 0% | 177 |
| April | 1% | 0% | 192 |
| May | 1% | 0% | 152 |
| June | 1% | 0% | 173 |
| July | 1% | 0% | 159 |
| August | 1% | 0% | 149 |
| September | 1% | 0% | 146 |
| October | 1% | 0% | 148 |
| November | 1% | 0% | 159 |
| December | 1% | 0% | 130 |
Frequently asked
What is the best month to fly from PDX to ONT?
January has the highest on-time rate at 1% for flights from Portland to Ontario.
What is the worst month to fly PDX to ONT?
January has the lowest on-time rate at 1%, often due to winter weather.
How often are PDX to ONT flights delayed?
On average, 1% of flights from PDX to ONT arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.