Route · MDW → ONT · 2020–2025 BTS data
Chicago to Ontario
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MDW to ONT (Chicago to Ontario) ranks #4225 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 77.7%
- On-time
- -1.3 pts
- vs US avg
- 65 min
- Delay when late
- 1,393
- Flights
- #4225 of 4927
- Corpus placement
Cancelled
1.3%
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 | 11 | 0 | 0 | WN |
| Nov 2025 | 30 | 1 | 2 | 0 | WN |
| Oct 2025 | 31 | 8 | 0 | 0 | WN |
| Sep 2025 | 30 | 7 | 0 | 0 | WN |
| Aug 2025 | 31 | 9 | 1 | 0 | WN |
| Jul 2025 | 31 | 13 | 0 | 0 | WN |
| Jun 2025 | 30 | 11 | 0 | 0 | WN |
| May 2025 | 31 | 6 | 0 | 0 | WN |
| Apr 2025 | 30 | 5 | 0 | 0 | WN |
| Mar 2025 | 31 | 4 | 1 | 0 | WN |
| Oct 2024 | 31 | 3 | 0 | 0 | WN |
| Sep 2024 | 34 | 4 | 0 | 0 | WN |
| Aug 2024 | 34 | 5 | 0 | 0 | WN |
| Jul 2024 | 31 | 6 | 0 | 0 | WN |
| Jun 2024 | 30 | 10 | 0 | 2 | WN |
| May 2024 | 31 | 12 | 0 | 0 | WN |
| Apr 2024 | 30 | 4 | 0 | 0 | WN |
| Mar 2024 | 31 | 3 | 0 | 0 | WN |
| Jan 2024 | 31 | 4 | 5 | 0 | WN |
| Dec 2023 | 31 | 2 | 0 | 0 | WN |
| Nov 2023 | 30 | 5 | 0 | 0 | WN |
| Sep 2023 | 30 | 10 | 0 | 0 | WN |
| Aug 2023 | 31 | 7 | 1 | 0 | WN |
| Jul 2023 | 31 | 11 | 0 | 1 | WN |
MDW–ONT seasonal on-time pattern
Best: November (86.6%) · weakest: December (67.7%)
Strongest calendar month
November
86.6% on-time · ~40 flights/mo
Busiest calendar month
December
~41 flights/mo avg
Weakest calendar month
December
67.7% on-time · ~41 flights/mo
Cancellation Rate
1.3%
10 of 742 flights
Diversion Rate
0.4%
3 of 742 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
MDW on-time profileONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
ONT on-time profileCompare the two airports
See MDW and ONT side by side on delays, cancellations, and reliability.
Compare MDW vs ONTOrigin-hub reliability standing
Mid-pack among MDW departures
From MDW, this corridor sits with 51 other 75–85% on-time routes out of 69 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 18 below 75%). Destination: Ontario · fleet on-time rank #3924 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to MDW–ONT.
Routes with a similar on-time rate
What the Data Says About MDW to ONT
The Chicago to Ontario corridor (MDW to ONT) posts a 77.7% on-time rate on the lower edge of the average band, based on 1,393 tracked flights. Late flights run 64.7 minutes behind on average. 4 carriers cover the 1,706-mile route; over the last 24 months, 10 of 742 flights were cancelled (1.3%) and 0.4% diverted.
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.
On the multi-year calendar, MDW–ONT peaks in November at 86.6% on-time while December carries the heaviest traffic (~41 flights per month) ; the softest month is December at 67.7%, a 18.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does MDW to ONT rank among US routes by traffic? ▼
How often are flights delayed from MDW to ONT? ▼
What is the cancellation rate for MDW to ONT? ▼
How far is the flight from MDW to ONT? ▼
Airports on this route
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.
Using MDW–ONT data
MDW–ONT is mid-pack at 77.7% on-time; month and carrier mix move more than the corridor headline.
- Compare MDW and ONT airport profiles: delay causes and top routes differ even on the same corridor. MDW airport
- If your dates flex, November (86.6% on-time) beats December (67.7%) on this corridor. Seasonal chart
- 4 other routes post a similar 77.7% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.