Route · ONT → MDW · 2020–2025 BTS data
Ontario to Chicago
The ONT–MDW corridor (Ontario, CA → Chicago, IL) runs ahead of the national average, served by 4 carriers across roughly 1,706 miles.
Data updated 2026-06-13
- 87.5%
- On-time
- +8.5 pts
- vs US avg
- 57 min
- Delay when late
- 1,463
- Flights
Cancelled
0.4%
Best Month
N/A
Worst Month
N/A
Distance
1,706 mi
Carriers
4
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 31 | 4 | 0 | 0 | WN |
| Nov 2025 | 30 | 3 | 1 | 0 | WN |
| Oct 2025 | 31 | 0 | 0 | 0 | WN |
| Sep 2025 | 30 | 1 | 0 | 0 | WN |
| Aug 2025 | 31 | 2 | 0 | 1 | WN |
| Jul 2025 | 31 | 5 | 0 | 0 | WN |
| Jun 2025 | 30 | 5 | 0 | 0 | WN |
| May 2025 | 31 | 1 | 0 | 0 | WN |
| Apr 2025 | 30 | 0 | 0 | 0 | WN |
| Mar 2025 | 31 | 2 | 0 | 0 | WN |
| Oct 2024 | 31 | 4 | 0 | 1 | WN |
| Sep 2024 | 34 | 6 | 0 | 0 | WN |
| Aug 2024 | 34 | 4 | 0 | 0 | WN |
| Jul 2024 | 31 | 2 | 0 | 0 | WN |
| Jun 2024 | 30 | 2 | 0 | 0 | WN |
| May 2024 | 31 | 3 | 0 | 1 | WN |
| Apr 2024 | 30 | 2 | 0 | 0 | WN |
| Mar 2024 | 31 | 1 | 0 | 0 | WN |
| Jan 2024 | 31 | 4 | 2 | 0 | WN |
| Dec 2023 | 31 | 5 | 0 | 0 | WN |
| Sep 2023 | 30 | 3 | 0 | 0 | WN |
| Aug 2023 | 31 | 4 | 0 | 0 | WN |
| Jul 2023 | 31 | 9 | 0 | 1 | WN |
| Jun 2023 | 30 | 7 | 0 | 0 | WN |
Cancellation Rate
0.4%
3 of 742 flights
Diversion Rate
0.5%
4 of 742 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
Origin airport →MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See ONT and MDW side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to ONT–MDW.
Routes with a similar on-time rate
What the Data Says About ONT to MDW
Ontario to Chicago (ONT to MDW) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.5% on-time rate across 1,463 flights, with delays that do happen averaging 56.6 minutes. The corridor runs roughly 1,706 miles and is served by 4 carriers. Over the most recent 24 months, 3 of 742 flights were cancelled (0.4%) and 4 diverted (0.5%).
Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.
Frequently Asked Questions
How often are flights delayed from ONT to MDW? ▼
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.