Best Time to Fly ONT to ORD
Ontario to Chicago — month-by-month delay data from the Bureau of Transportation Statistics.
Best month
March
1% on time
Worst month
March
1% on time
ONT → ORD on-time performance by month
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
Monthly breakdown
| Month | On-time | Cancel rate | Flights |
|---|---|---|---|
| March | 1% | 0% | 27 |
| April | 1% | 0% | 30 |
| May | 1% | 0% | 41 |
| June | 1% | 0% | 60 |
| July | 1% | 0% | 62 |
| August | 1% | 0% | 31 |
| September | 1% | 0% | 30 |
| October | 1% | 0% | 31 |
| November | 1% | 0% | 30 |
| December | 1% | 0% | 15 |
Frequently asked
What is the best month to fly from ONT to ORD?
March has the highest on-time rate at 1% for flights from Ontario to Chicago.
What is the worst month to fly ONT to ORD?
March has the lowest on-time rate at 1%, often due to seasonal weather patterns.
How often are ONT to ORD flights delayed?
On average, 1% of flights from ONT to ORD arrive on time. That means about 99% experience some form of delay.
Source: Bureau of Transportation Statistics.