Flight number record
UA 2431
United Airlines · Houston to Los Angeles
- Route
- IAH → LAX
- Departs
- 06:00
- Flights
- 261
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2431, check with United Airlines.
UA 2431 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 261 flights, with a median arrival 15 minutes early.
Set against the rest of the country, UA 2431's record is 18 points better than the US average of 77.3%. That gap is worth roughly 181 fewer late arrivals for every thousand flights.
Key figures
On time
95.4%
Arrivals under 15 minutes late, of 259 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.77%
National rate is 1.89%
1 hour+ late
1.5%
National rate is 8.3%
These figures cover 261 flights between September 2025 and August 2026. The median arrival is 15 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 2431 flies
UA 2431 is scheduled to leave Houston (IAH) at 06:00 local time and reach Los Angeles (LAX) at 07:40. That slot held for 223 of the 261 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00223 flights85.4%
- Departs 06:0132 flights12.3%
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 2431 runs 6 points better at 95.4%. 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 2431 next to IAH to LAX
Every carrier on IAH to LAX combined arrived on time 84.1% of the time across 5,147 flights, so UA 2431 is 11 points ahead of it. United flew 3,421 flights on the same city pair under all its flight numbers, including this one, and those ran 85.7% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2431thin sample | 261 | 95.4% | 53 min | 0.77% | A+ |
| All United Airlines on IAH–LAX | 3,421 | 85.7% | 57 min | 0.20% | A+ |
| All carriers on IAH–LAX | 5,147 | 84.1% | 62 min | 0.45% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2431 quarter by quarter
Quarter by quarter UA 2431 held fairly steady: 100.0% in Jul–Sep 2025, 94.6% in Oct–Dec 2025, 94.3% in Jan–Mar 2026 and 96.0% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202592 flights94.6%
- Jan–Mar 202689 flights94.3%
- Apr–Jun 202650 flights96.0%
Scale runs 85% to 100%.
By weekday, UA 2431 did best on Wednesday at 100.0% on time and worst on Saturday at 86.5%. Each day rests on about 37 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2431 runs when it is late
UA 2431 often beats the schedule: 132 of 259 completed flights, 51%, arrived 15 minutes or more early. Most of the lateness is short. 7 of the 12 late arrivals were under half an hour behind, and 4 reached an hour or more.
- 15+ min early132 flights51.0%
- Within 15 min115 flights44.4%
- 15–29 min late7 flights2.7%
- 30–59 min late1 flights0.4%
- 1–2 hours late3 flights1.2%
- 2+ hours late1 flights0.4%
Scale runs 0% to 100%.
Share of 259 completed flights by arrival against schedule.
Only 9 of 259 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 2431
The latest arrival of the period was on 16 March 2026, 3 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 3 hours 46 minutes | Carrier |
| 28 April 2026 | 1 hour 41 minutes | Carrier |
| 16 February 2026 | 1 hour 14 minutes | Carrier |
| 14 February 2026 | 1 hour 5 minutes | Carrier |
| 18 October 2025 | 44 minutes | Carrier |
Delay causes
Why UA 2431 runs late
Carrier accounts for 80% of the 634 delay minutes carriers reported here, and the remaining four split what is left.
- 80%Carrier
- 20%National Airspace System
The largest share of delay minutes, 80%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 510 of the 634 delay minutes reported here. The split is drawn from 634 delay minutes reported on UA 2431.
Cancellations are rare at 0.77%, 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 1.5% 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 1,379 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.
The same number turns up on three other city pairs in the data, including SFO to PHL (47), ORD to DEN (35) and ORD to PHL (21), but none flew often enough under UA 2431 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. 261 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 2431
For a booking, UA 2431 has one of the better records a US domestic flight can show: 95.4% on time and 0.77% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- IAH to LAX, every carrier and departure
- LAX to IAH, the return direction
- Delta Air Lines 1216 on the same route93.1%
- United Airlines 2460 on the same route89.0%
- United Airlines 1743 on the same route83.3%
- United Airlines 2600 on the same route91.3%
- United Airlines 469 on the same route89.0%
- Frontier Airlines 1755 on the same route71.9%
- 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
- 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.