Route · ATL → ONT · 2020–2025 BTS data
Atlanta to Ontario
The ATL–ONT corridor (Atlanta, GA → Ontario, CA) runs ahead of the national average, served by 2 carriers across roughly 1,900 miles.
Data updated 2026-06-13
- 80.5%
- On-time
- +1.5 pts
- vs US avg
- 59 min
- Delay when late
- 4,903
- Flights
Cancelled
1.2%
Best Month
Oct 2024 95%
Worst Month
May 2024 56%
Distance
1,900 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 88 | 23 | 4 | 0 | DL |
| Nov 2025 | 84 | 14 | 1 | 0 | DL |
| Oct 2025 | 85 | 17 | 0 | 0 | DL |
| Sep 2025 | 77 | 13 | 0 | 0 | DL |
| Aug 2025 | 82 | 19 | 1 | 0 | DL |
| Jul 2025 | 88 | 24 | 1 | 0 | DL |
| Jun 2025 | 84 | 33 | 2 | 0 | DL |
| May 2025 | 81 | 25 | 0 | 0 | DL |
| Apr 2025 | 77 | 16 | 0 | 0 | DL |
| Mar 2025 | 62 | 12 | 1 | 1 | DL |
| Feb 2025 | 56 | 15 | 0 | 0 | DL |
| Jan 2025 | 66 | 13 | 4 | 1 | DL |
| Dec 2024 | 88 | 19 | 0 | 1 | DL |
| Nov 2024 | 77 | 18 | 0 | 1 | DL |
| Oct 2024 | 84 | 4 | 0 | 0 | DL |
| Sep 2024 | 80 | 11 | 0 | 0 | DL |
| Aug 2024 | 85 | 18 | 0 | 0 | DL |
| Jul 2024 | 82 | 32 | 9 | 0 | DL |
| Jun 2024 | 87 | 17 | 0 | 0 | DL |
| May 2024 | 79 | 35 | 0 | 0 | DL |
| Apr 2024 | 72 | 22 | 0 | 0 | DL |
| Mar 2024 | 62 | 10 | 0 | 0 | DL |
| Feb 2024 | 58 | 7 | 0 | 1 | DL |
| Jan 2024 | 63 | 10 | 0 | 0 | DL |
Cancellation Rate
1.2%
23 of 1,847 flights
Diversion Rate
0.3%
5 of 1,847 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ATL - Atlanta
Full on-time, delay-cause, and seasonal performance for Atlanta, GA.
Origin airport →ONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
Destination airport →Compare the two airports
See ATL and ONT side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to ATL–ONT.
Routes with a similar on-time rate
What the Data Says About ATL to ONT
4,903 tracked flights put the ATL to ONT pairing (Atlanta to Ontario) at a 80.5% on-time rate, squarely in line with the wider network. Delays that do occur run 59.3 minutes on average. Across the 1,900-mile route and its 2 carriers, the trailing 24 months show 1.2% cancelled and 0.3% diverted (1,847 flights sampled).
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 95% on-time, while May 2024 came in at just 56% - a 40-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from ATL to ONT? ▼
What is the cancellation rate for ATL to ONT? ▼
How far is the flight from ATL to ONT? ▼
When is the best time to fly from ATL to ONT? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
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.