Flight number record
UA 1936
United Airlines · Ontario to Houston
- Route
- ONT → IAH
- Departs
- 06:00
- Flights
- 353
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1936, check with United Airlines.
UA 1936 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 353 flights, with a median arrival 6 minutes early.
Set against the rest of the country, UA 1936's record is 14 points better than the US average of 77.3%. That gap is worth roughly 142 fewer late arrivals for every thousand flights.
Key figures
On time
91.5%
Arrivals under 15 minutes late, of 351 completed flights
Avg delay
95 min
Across delayed arrivals only, not all flights
Cancelled
0.57%
National rate is 1.89%
1 hour+ late
2.8%
National rate is 8.3%
These figures cover 353 flights between September 2025 and August 2026. The median arrival is 6 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 1936 flies
UA 1936 flies ONT to IAH without a single fixed slot. Its most common scheduled departure was 06:00, used on 142 of 353 flights, with 05:45 (82 flights) and 06:05 (68 flights) next.
- Departs 06:00142 flights40.2%
- Departs 05:4582 flights23.2%
- Departs 06:0568 flights19.3%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1936 runs 2 points better at 91.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1936 next to ONT to IAH
Every carrier on ONT to IAH combined arrived on time 86.4% of the time across 574 flights, so UA 1936 is 5 points ahead of it. Across its whole network United Airlines managed 78.8%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1936thin sample | 353 | 91.5% | 95 min | 0.57% | A+ |
| All United Airlines on ONT–IAHthin sample | 356 | 91.5% | 95 min | 0.56% | A+ |
| All carriers on ONT–IAH | 574 | 86.4% | 75 min | 1.22% | A |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1936 quarter by quarter
Quarter by quarter UA 1936 held fairly steady: 86.7% in Jul–Sep 2025, 92.4% in Oct–Dec 2025, 89.9% in Jan–Mar 2026, 94.4% in Apr–Jun 2026 and 90.0% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202592 flights92.4%
- Jan–Mar 202690 flights89.9%
- Apr–Jun 202691 flights94.4%
- Jul–Sep 202650 flights90.0%
Scale runs 80% to 100%.
By weekday, UA 1936 ranged from 86.8% on Monday to 95.9% on Tuesday. With about 50 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1936 runs when it is late
The 30 late arrivals split 14 under half an hour, 6 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early69 flights19.7%
- Within 15 min252 flights71.8%
- 15–29 min late14 flights4.0%
- 30–59 min late6 flights1.7%
- 1–2 hours late3 flights0.9%
- 2+ hours late7 flights2.0%
Scale runs 0% to 100%.
Share of 351 completed flights by arrival against schedule.
8 of 29 late departures made up the time and arrived on time, 28% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for UA 1936
The latest arrival of the period was on 26 October 2025, 7 hours 48 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 October 2025 | 7 hours 48 minutes | Carrier |
| 2 March 2026 | 7 hours 45 minutes | Late-arriving aircraft |
| 15 January 2026 | 6 hours 28 minutes | Carrier |
| 11 September 2025 | 5 hours 50 minutes | Carrier |
| 8 September 2025 | 2 hours 36 minutes | Late-arriving aircraft |
Delay causes
Why UA 1936 runs late
Carrier accounts for 54% of the 2,843 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 23%National Airspace System
- 21%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,523 of the 2,843 delay minutes reported here. The split is drawn from 2,843 delay minutes reported on UA 1936.
Cancellations are rare at 0.57%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,334 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on eight other city pairs in the data, including IAH to TPA (82), IAH to OMA (55) and IAH to ATL (31), but none flew often enough under UA 1936 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ONT to IAH only.
One caution: this is a thin sample. 353 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 1936
For a booking, UA 1936 has one of the better records a US domestic flight can show: 91.5% on time and 0.57% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Ontario International (ONT) delay statistics
- George Bush Intercontinental (IAH) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.