Flight profile · United Airlines
UA1743
Houston (IAH) to Los Angeles (LAX) · scheduled 4:20 PM – 6:10 PM
How UA1743 performs
1,004 operations, September 2023 – July 2026.
UA1743 arrived on time 79.4% of the time, against 82.8% for all IAH → LAX flights, so this departure is 3.4 percentage points worse than the route as a whole. Against United Airlines’ own flights on this route it is 3.4 points worse.
Source: US DOT Bureau of Transportation Statistics · 1,004 operations, September 2023 – July 2026 · If UA1743 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where UA1743 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA1743 | 79.4% | 1.20% | -5 min | 6.8% | 1,004 |
| United Airlines on IAH → LAX | 82.8% | 1.00% | -7 min | 5.8% | 10,501 |
| All IAH → LAX flights | 82.8% | 1.01% | -8 min | 5.9% | 16,491 |
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026
Why UA1743 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA1743 on IAH → LAX. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies UA1743 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, UA1743 pushed back an average of 51 minutes late; when it came in on time or early, an average of 7 minutes late.
Each departure is matched to the flight the same aircraft flew into IAH just before it, using the tail number in the DOT file, 812 of 992 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| UA1743 | 15% | 71% | 13% |
| Network, same turn | 17% | 68% | 9% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often UA1743’s aircraft landed 15 or more minutes late is about the same as the network’s and, once the aircraft was late, how often UA1743 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
From pushback to gate
When it leaves IAH late, does that still matter by the time it reaches LAX?
UA1743 pushes back an average of 13.8 minutes late and reaches the gate at LAX an average of 5.8 minutes late. The 8.0 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. Its 20.6 minutes on the taxiways at IAH is about what any departure from the airport in that hour spends.
On arrival at LAX, UA1743 spends 9.0 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 1.8 minutes shorter than a typical LAX arrival (10.7 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached LAX. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 27,829 departures from IAH scheduled in the clock hour UA1743 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at LAX (595,170 flights), not just UA1743’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026
The hour it leaves IAH
Part of any flight’s record belongs to the clock rather than to the flight. UA1743 has one departure time, so this is what that time is worth.
On-time arrival rate. 27,829 departures from IAH are scheduled in the 4 PM–5 PM hour over the period, against 359,450 across the whole day.
UA1743 is scheduled out of IAH at 4:20 PM, in the 4 PM–5 PM bank. Departures from IAH in that hour arrive on time 72.8% of the time against 77.4% across the airport’s whole day — the slot alone is worth 4.6 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from IAH to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does UA1743 run worse on particular days?
Monday is historically the most reliable day and Wednesday the least, a gap of 12.0 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026 · Days with fewer than 120 operations are not scored.
Other routes UA1743 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| MIA→IAH Miami to Houston | December 18, 2025 – May 20, 2026 | 98 | 92.8% |
| LAX→SMF Los Angeles to Sacramento | February 13–28, 2026 | 7 | — |
| LAX→SFO Los Angeles to San Francisco | October 29, 2023 – February 7, 2026 | 233 | 62.2% |
| LAX→DEN Los Angeles to Denver | December 18, 2025 – January 5, 2026 | 19 | — |
| SFO→SBA San Francisco to Santa Barbara | June 26, 2025 – December 1, 2025 | 149 | 79.9% |
| IAD→IAH Washington to Houston | May 22, 2025 – June 25, 2025 | 35 | — |
| LAX→ORD Los Angeles to Chicago | May 4, 2025 | 1 | — |
| SFO→FLL San Francisco to Fort Lauderdale | March 6–29, 2025 | 18 | — |
| LGA→IAH New York to Houston | September 5, 2023 – February 12, 2025 | 105 | 87.5% |
| MSY→IAH New Orleans to Houston | December 19, 2024 – January 6, 2025 | 19 | — |
| PHL→IAH Philadelphia to Houston | October 29, 2023 – October 26, 2024 | 212 | 88.0% |
| ORD→PHL Chicago to Philadelphia | June 27–30, 2024 | 4 | — |
| LAX→LAS Los Angeles to Las Vegas | January 12, 2024 | 1 | — |
| IAD→EWR Washington to Newark | July 1, 2023 – September 4, 2023 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1743 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
41 min late
against a median of 5 min early
Percentiles over 1,004 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA2431 | United Airlines | 96.4% | 16 min early | 832 |
| DL1216 | Delta Air Lines | 91.9% | 12 min early | 963 |
| UA1945 | United Airlines | 82.8% | 8 min early | 847 |
| UA1743 this flight | United Airlines | 79.4% | 5 min early | 1,004 |
| UA2095 | United Airlines | 75.1% | 2 min early | 684 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA1743 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 1,004 records of UA1743 operating IAH → LAX, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed