Flight number record

UA 1936

United Airlines · Ontario to Houston

Route: ONT → IAH
Departs: 06:00
Flights: 334
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 334 flights, with a median arrival 6 minutes early.

Set against the rest of the country, UA 1936's record is 13 points better than the US average of 77.6%. That gap is worth roughly 131 fewer late arrivals for every thousand flights.

On time

90.7%

Arrivals under 15 minutes late, of 332 completed flights

Avg delay

93 min

Across delayed arrivals only, not all flights

Cancelled

0.60%

National rate is 1.81%

1 hour+ late

3.0%

National rate is 8.1%

These figures cover 334 flights between July 2025 and June 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.

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 151 of 334 flights, with 06:05 (68 flights) and 06:04 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:00151 flights45.2%
Departs 06:0568 flights20.4%
Departs 06:0451 flights15.3%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 level with that at 90.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

UA 1936 next to ONT to IAH

Every carrier on ONT to IAH combined arrived on time 84.6% of the time across 537 flights, so UA 1936 is 6 points ahead of it. Across its whole network United Airlines managed 79.0%, which this flight beats by 12 points.

UA 1936 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1936thin sample	334	90.7%	93 min	0.60%	A+
All United Airlines on ONT–IAH	365	89.8%	99 min	0.55%	A+
All carriers on ONT–IAH	537	84.6%	84 min	0.93%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1936 quarter by quarter

UA 1936 did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.4% on time and its weakest Jul–Sep 2025 at 83.6%, a swing of 11 points on roughly 84 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202561 flights83.6%
Oct–Dec 202592 flights92.4%
Jan–Mar 202690 flights89.9%
Apr–Jun 202691 flights94.4%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1936 ranged from 85.4% on Friday to 95.8% on Tuesday. With about 48 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 1936 runs late

One category carries most of the weight here. Carrier accounts for 54% of the 2,888 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
54%
National Airspace System
23%
Late-arriving aircraft
21%
Extreme weather
2%

The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,565 of the 2,888 delay minutes reported here. The split is drawn from 2,888 delay minutes reported on UA 1936.

Cancellations are rare at 0.60%, below the national 1.81% 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 3.0% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on eight other city pairs in the data, including IAH to TPA (82), IAH to OMA (68) and IAH to LGA (34), 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. 334 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: 90.7% on time and 0.60% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures