Flight number record
UA 2377
United Airlines · Los Angeles to Houston
- Route
- LAX → IAH
- Departs
- 16:10
- Flights
- 357
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2377, check with United Airlines.
UA 2377 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 357 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 2377's record is 7 points better than the US average of 77.6%. That gap is worth roughly 71 fewer late arrivals for every thousand flights.
Key figures
On time
84.7%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.81%
1 hour+ late
6.2%
National rate is 8.1%
These figures cover 357 flights between July 2025 and June 2026. The median arrival is 8 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 2377 flies
UA 2377 flies LAX to IAH without a single fixed slot. Its most common scheduled departure was 16:10, used on 133 of 357 flights, with 15:20 (62 flights) and 16:20 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:10133 flights37.3%
- Departs 15:2062 flights17.4%
- Departs 16:2037 flights10.4%
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 16:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 2377 runs 12 points better at 84.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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 5,255 flights, so UA 2377 is about level with it. United flew 3,415 flights on the same city pair under all its flight numbers, including this one, and those ran 87.1% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2377thin sample | 357 | 84.7% | 64 min | 0.56% | B+ |
| All United Airlines on LAX–IAH | 3,415 | 87.1% | 55 min | 0.26% | A+ |
| All carriers on LAX–IAH | 5,255 | 84.6% | 64 min | 0.59% | B+ |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | 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 89 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 202585 flights81.0%
- Oct–Dec 202591 flights86.8%
- Jan–Mar 202690 flights92.0%
- Apr–Jun 202691 flights79.1%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2377 did best on Thursday at 90.2% on time and worst on Friday at 76.5%. Each day rests on about 51 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
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 3,452 reported delay minutes.
- 36%Late-arriving aircraft
- 36%National Airspace System
- 28%Carrier
36% 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 3,452 reported delay minutes here, that single category outweighs weather by 36 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 3,452 delay minutes reported on UA 2377.
Cancellations are rare at 0.56%, 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
6.2% 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 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. 357 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, read UA 2377 as 84.7% on time with 0.56% cancelled over 357 flights. Those are rates from the past twelve months, not a forecast for any particular 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 route87.2%
- United Airlines 1416 on the same route91.1%
- Frontier Airlines 1756 on the same route67.6%
- United Airlines 2086 on the same route84.7%
- United Airlines 491 on the same route92.9%
- Delta Air Lines 1287 on the same route84.7%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.