Route · ONT → IAH · 2020–2025 BTS data
Ontario to Houston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ONT to IAH (Ontario to Houston) ranks #4170 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 81.9%
- On-time
- +2.9 pts
- vs US avg
- 77 min
- Delay when late
- 1,472
- Flights
- #4170 of 4927
- Corpus placement
Cancelled
1.1%
Best Month
Apr 2025 85%
Worst Month
Mar 2025 76%
Distance
1,334 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 44 | 10 | 0 | 0 | F9,UA |
| Nov 2025 | 47 | 4 | 0 | 0 | UA,F9 |
| Oct 2025 | 48 | 5 | 0 | 0 | UA,F9 |
| Sep 2025 | 43 | 7 | 0 | 0 | UA,F9 |
| Aug 2025 | 40 | 11 | 0 | 0 | F9,UA |
| Jul 2025 | 38 | 7 | 0 | 0 | UA,F9 |
| Jun 2025 | 39 | 9 | 1 | 1 | UA,F9 |
| May 2025 | 44 | 4 | 1 | 0 | UA,F9 |
| Apr 2025 | 54 | 8 | 0 | 0 | F9,UA |
| Mar 2025 | 59 | 14 | 1 | 0 | UA,F9 |
| Feb 2025 | 39 | 6 | 0 | 0 | UA,F9 |
| Jan 2025 | 41 | 7 | 2 | 0 | UA,F9 |
| Dec 2024 | 42 | 10 | 1 | 0 | F9,UA |
| Nov 2024 | 47 | 6 | 0 | 0 | UA,F9 |
| Oct 2024 | 48 | 10 | 0 | 0 | UA,F9 |
| Sep 2024 | 47 | 11 | 1 | 0 | UA,F9 |
| Aug 2024 | 43 | 4 | 1 | 0 | F9,UA |
| Jul 2024 | 49 | 19 | 2 | 0 | F9,UA |
| Jun 2024 | 47 | 16 | 0 | 0 | F9,UA |
| Jul 2022 | 31 | 6 | 0 | 0 | UA |
| Jun 2022 | 30 | 8 | 1 | 0 | UA |
| May 2022 | 31 | 6 | 0 | 0 | UA |
| Apr 2022 | 30 | 3 | 0 | 0 | UA |
| Mar 2022 | 31 | 2 | 0 | 0 | UA |
ONT–IAH seasonal on-time pattern
Best: January (90.4%) · weakest: July (66.4%)
Strongest calendar month
January
90.4% on-time · ~35 flights/mo
Busiest calendar month
November
~41 flights/mo avg
Weakest calendar month
July
66.4% on-time · ~37 flights/mo
Cancellation Rate
1.1%
11 of 1,012 flights
Diversion Rate
0.1%
1 of 1,012 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.
ONT on-time profileIAH - Houston
Full on-time, delay-cause, and seasonal performance for Houston, TX.
IAH on-time profileCompare the two airports
See ONT and IAH side by side on delays, cancellations, and reliability.
Compare ONT vs IAHOrigin-hub reliability standing
Mid-pack among ONT departures
From ONT, this corridor sits with 9 other 75–85% on-time routes out of 21 tracked departures, not the hub's reliability leaders (10 at ≥85%) and not the softest ( 2 below 75%). Destination: Houston · fleet on-time rank #2410 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to ONT–IAH.
Routes with a similar on-time rate
What the Data Says About ONT to IAH
1,472 tracked flights put the ONT to IAH pairing (Ontario to Houston) at a 81.9% on-time rate, squarely in line with the wider network. Delays that do occur run 76.7 minutes on average. Across the 1,334-mile route and its 8 carriers, the trailing 24 months show 1.1% cancelled and 0.1% diverted (1,012 flights sampled).
Monthly performance varies moderately here: Apr 2025 was the strongest month at 85% on-time versus Mar 2025 at 76%, a 9-point difference.
On the multi-year calendar, ONT–IAH peaks in January at 90.4% on-time while November carries the heaviest traffic (~41 flights per month) ; the softest month is July at 66.4%, a 24.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does ONT to IAH rank among US routes by traffic? ▼
How often are flights delayed from ONT to IAH? ▼
What is the cancellation rate for ONT to IAH? ▼
How far is the flight from ONT to IAH? ▼
When is the best time to fly from ONT to IAH? ▼
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 ONT–IAH data
ONT–IAH is mid-pack at 81.9% on-time; month and carrier mix move more than the corridor headline.
- Compare ONT and IAH airport profiles: delay causes and top routes differ even on the same corridor. ONT airport
- If your dates flex, January (90.4% on-time) beats July (66.4%) on this corridor. Seasonal chart
- 4 other routes post a similar 81.9% 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.