Route · IAH → ONT · 2020–2025 BTS data
Houston to Ontario
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to ONT (Houston to Ontario) ranks #4167 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 71.9%
- On-time
- -7.1 pts
- vs US avg
- 69 min
- Delay when late
- 1,475
- Flights
- #4167 of 4927
- Corpus placement
Cancelled
1.4%
Best Month
Apr 2025 70%
Worst Month
Mar 2025 63%
Distance
1,334 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 44 | 12 | 0 | 1 | F9,UA |
| Nov 2025 | 47 | 15 | 0 | 0 | UA,F9 |
| Oct 2025 | 48 | 15 | 0 | 0 | UA,F9 |
| Sep 2025 | 43 | 8 | 0 | 0 | UA,F9 |
| Aug 2025 | 40 | 15 | 1 | 0 | F9,UA |
| Jul 2025 | 39 | 17 | 0 | 0 | UA,F9 |
| Jun 2025 | 39 | 25 | 1 | 0 | UA,F9 |
| May 2025 | 45 | 18 | 0 | 0 | UA,F9 |
| Apr 2025 | 54 | 16 | 1 | 0 | F9,UA |
| Mar 2025 | 59 | 22 | 1 | 0 | UA,F9 |
| Feb 2025 | 39 | 7 | 1 | 0 | UA,F9 |
| Jan 2025 | 41 | 13 | 2 | 1 | UA,F9 |
| Dec 2024 | 42 | 16 | 1 | 0 | F9,UA |
| Nov 2024 | 47 | 11 | 0 | 0 | UA,F9 |
| Oct 2024 | 48 | 18 | 0 | 0 | UA,F9 |
| Sep 2024 | 47 | 16 | 0 | 0 | UA,F9 |
| Aug 2024 | 43 | 18 | 0 | 0 | F9,UA |
| Jul 2024 | 49 | 24 | 5 | 0 | F9,UA |
| Jun 2024 | 47 | 23 | 0 | 0 | F9,UA |
| Jul 2022 | 31 | 7 | 0 | 0 | UA |
| Jun 2022 | 30 | 13 | 1 | 0 | UA |
| May 2022 | 31 | 6 | 0 | 0 | UA |
| Apr 2022 | 30 | 8 | 0 | 0 | UA |
| Mar 2022 | 31 | 6 | 0 | 0 | UA |
IAH–ONT seasonal on-time pattern
Best: January (83.5%) · weakest: June (55.8%)
Strongest calendar month
January
83.5% on-time · ~34 flights/mo
Busiest calendar month
November
~41 flights/mo avg
Weakest calendar month
June
55.8% on-time · ~37 flights/mo
Cancellation Rate
1.4%
14 of 1,014 flights
Diversion Rate
0.2%
2 of 1,014 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
IAH on-time profileONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
ONT on-time profileCompare the two airports
See IAH and ONT side by side on delays, cancellations, and reliability.
Compare IAH vs ONTOrigin-hub reliability standing
Softer reliability from IAH
Among 102 routes leaving IAH, only 6 (including this one) clear below 75% on-time, while 17 stay ≥85% and 79 sit mid-band. Travelers comparing IAH options should weigh this 71.9% print against those peers · fleet on-time rank #4762 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAH–ONT.
Routes with a similar on-time rate
What the Data Says About IAH to ONT
On-time performance on the IAH to ONT pairing (Houston to Ontario) trails a chunk of the network: 71.9% of 1,475 tracked flights arrived on schedule, with a 68.9-minute average delay on the ones that ran late. The route spans about 1,334 miles across 8 carriers. Cancellations over the trailing 24 months hit 1.4% (14 of 1,014 flights), with 0.2% diverted.
Monthly performance varies moderately here: Apr 2025 was the strongest month at 70% on-time versus Mar 2025 at 63%, a 8-point difference.
On the multi-year calendar, IAH–ONT peaks in January at 83.5% on-time while November carries the heaviest traffic (~41 flights per month) ; the softest month is June at 55.8%, a 27.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does IAH to ONT rank among US routes by traffic? ▼
How often are flights delayed from IAH to ONT? ▼
What is the cancellation rate for IAH to ONT? ▼
How far is the flight from IAH to ONT? ▼
When is the best time to fly from IAH 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 IAH–ONT data
IAH–ONT sits 7.1 pts below the national 79% average; check the seasonal chart and airport profiles before treating the headline as typical.
- Compare IAH and ONT airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
- If your dates flex, January (83.5% on-time) beats June (55.8%) on this corridor. Seasonal chart
- 4 other routes post a similar 71.9% 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.