Flight number record
UA 1743
United Airlines · Houston to Los Angeles
- Route
- IAH → LAX
- Departs
- 16:20
- Flights
- 359
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1743, check with United Airlines.
UA 1743 lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 359 flights, with a median arrival 6 minutes early.
Key figures
On time
80.5%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
6.7%
National rate is 8.1%
These figures cover 359 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 1743 flies
UA 1743 flies IAH to LAX without a single fixed slot. Its most common scheduled departure was 16:20, used on 103 of 359 flights, with 16:30 (71 flights) and 16:25 (71 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:20103 flights28.7%
- Departs 16:3071 flights19.8%
- Departs 16:2571 flights19.8%
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 16:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 1743 runs 8 points better at 80.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1743 next to IAH to LAX
Every carrier on IAH to LAX combined arrived on time 83.6% of the time across 5,260 flights, so UA 1743 is 3 points behind it. United flew 3,416 flights on the same city pair under all its flight numbers, including this one, and those ran 84.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1743thin sample | 359 | 80.5% | 62 min | 0.00% | B+ |
| All United Airlines on IAH–LAX | 3,416 | 84.4% | 59 min | 0.32% | B+ |
| All carriers on IAH–LAX | 5,260 | 83.6% | 64 min | 0.57% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1743 quarter by quarter
UA 1743 did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.8% on time and its weakest Jul–Sep 2025 at 73.6%, a swing of 14 points on roughly 90 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 202591 flights73.6%
- Oct–Dec 202591 flights84.6%
- Jan–Mar 202690 flights87.8%
- Apr–Jun 202687 flights75.9%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1743 did best on Friday at 86.5% on time and worst on Saturday at 71.2%. Each day rests on about 51 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1743 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,317 reported delay minutes.
- 42%Late-arriving aircraft
- 28%Carrier
- 20%National Airspace System
- 11%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,317 reported delay minutes here, that single category outweighs weather by 4 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,317 delay minutes reported on UA 1743.
Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
6.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 1,379 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 five other city pairs in the data, including LAX to SFO (157), SFO to SBA (144) and MIA to IAH (98), but none flew often enough under UA 1743 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to LAX only.
One caution: this is a thin sample. 359 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 1743
For a booking, read UA 1743 as 80.5% on time with 0.00% cancelled over 359 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to LAX, every carrier and departure
- LAX to IAH, the return direction
- United Airlines 2460 on the same route87.4%
- Delta Air Lines 1216 on the same route94.2%
- United Airlines 2600 on the same route91.8%
- United Airlines 2095 on the same route73.6%
- United Airlines 469 on the same route87.0%
- United Airlines 1945 on the same route87.3%
- George Bush Intercontinental (IAH) delay statistics
- Los Angeles International (LAX) 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
- Why the first flight of the morning is statistically safest
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.