Flight number record
UA 2377
United Airlines · Los Angeles to Houston
- Route
- LAX → IAH
- Departs
- 15:20
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2377, check with United Airlines.
UA 2377 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 364 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 2377's record is 9 points better than the US average of 77.3%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.
Key figures
On time
85.9%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 7 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 2377 flies
UA 2377 flies LAX to IAH without a single fixed slot. Its most common scheduled departure was 15:20, used on 103 of 364 flights, with 16:10 (92 flights) and 16:35 (52 flights) next.
- Departs 15:20103 flights28.3%
- Departs 16:1092 flights25.3%
- Departs 16:3552 flights14.3%
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 15:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 2377 runs 14 points better at 85.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 2377 next to LAX to IAH
Every carrier on LAX to IAH combined arrived on time 84.6% of the time across 5,143 flights, so UA 2377 is about level with it. United flew 3,420 flights on the same city pair under all its flight numbers, including this one, and those ran 87.4% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2377thin sample | 364 | 85.9% | 58 min | 0.55% | A+ |
| All United Airlines on LAX–IAH | 3,420 | 87.4% | 52 min | 0.18% | A+ |
| All carriers on LAX–IAH | 5,143 | 84.6% | 61 min | 0.47% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2377 quarter by quarter
UA 2377 did not run the same all year. Its best quarter was Jan–Mar 2026 at 92.0% on time and its weakest Apr–Jun 2026 at 79.1%, a swing of 13 points on roughly 73 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 202530 flights86.7%
- Oct–Dec 202591 flights86.8%
- Jan–Mar 202690 flights92.0%
- Apr–Jun 202691 flights79.1%
- Jul–Sep 202662 flights85.5%
Scale runs 70% to 95%.
By weekday, UA 2377 did best on Thursday at 92.2% on time and worst on Friday at 76.9%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2377 runs when it is late
UA 2377 often beats the schedule: 100 of 362 completed flights, 28%, arrived 15 minutes or more early. The 51 late arrivals split 22 under half an hour, 12 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early100 flights27.6%
- Within 15 min211 flights58.3%
- 15–29 min late22 flights6.1%
- 30–59 min late12 flights3.3%
- 1–2 hours late11 flights3.0%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
11 of 50 late departures made up the time and arrived on time, 22% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for UA 2377
The latest arrival of the period was on 7 March 2026, 5 hours behind schedule; most of its delay minutes were filed as national airspace system delay. On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 5 hours | National Airspace System |
| 5 April 2026 | 2 hours 40 minutes | Late-arriving aircraft |
| 26 September 2025 | 2 hours 30 minutes | Late-arriving aircraft |
| 21 February 2026 | 2 hours 20 minutes | Late-arriving aircraft |
| 8 September 2025 | 2 hours 17 minutes | Late-arriving aircraft |
Delay causes
Why UA 2377 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 2,969 reported delay minutes.
- 40%Late-arriving aircraft
- 37%National Airspace System
- 23%Carrier
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,969 reported delay minutes here, that single category outweighs weather by 40 to one. The split is drawn from 2,969 delay minutes reported on UA 2377.
Cancellations are rare at 0.55%, 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 4.7% 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 one other city pair in the data, including IAH to ORD (2), but none flew often enough under UA 2377 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to IAH only.
One caution: this is a thin sample. 364 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 2377
For a booking, UA 2377 has one of the better records a US domestic flight can show: 85.9% on time and 0.55% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to IAH, every carrier and departure
- IAH to LAX, the return direction
- Delta Air Lines 1143 on the same route85.6%
- United Airlines 1416 on the same route91.8%
- Frontier Airlines 1756 on the same route70.2%
- United Airlines 491 on the same route90.5%
- Delta Air Lines 1287 on the same route83.9%
- United Airlines 2086 on the same route85.8%
- Los Angeles International (LAX) 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
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.