Chicago (MDW) to Ontario (ONT): On-Time Performance
Data through July 2026
Chicago (MDW) to Ontario (ONT) is a thinner route than most in this dataset — 360 departures over the past year, roughly 7 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 76% arrived on time.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 0.99
- last 12 months
- Duration
- 4h 17m
- scheduled
- Distance
- 1,706 mi
Monthly on-time trend
Best time to fly from MDW to ONT
Aim for departures around 9 a.m. (93% on-time); avoid 3 p.m. departures (48%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 13 min |
| Tuesday | 74% | 20 min |
| Wednesday | 78% | 13 min |
| Thursdaybest | 82% | 12 min |
| Friday | 77% | 13 min |
| Saturday | 77% | 10 min |
| Sunday | 68% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations39%
- National airspace system13%
- Weather5%
Frequently asked questions
- How often are flights from MDW to ONT delayed?
- 24% of MDW–ONT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- What is the best time of day to fly from MDW to ONT?
- Departures around 9 a.m. have the best record (93% on-time), while departures around 3 p.m. have the worst (48%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MDW to ONT?
- The scheduled MDW–ONT flight time averages 4h 17m over 1,706 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are MDW to ONT flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MDW to ONT?
- June 2026 was the roughest month in this dataset, with only 47% of arrivals on time. The best was November 2025 at 96%. If your dates are flexible, that 50-point gap is worth planning around.
Explore related pages
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Other ways to fly to Ontario (ONT)
Related guides
Based on 754 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.