Flight number record
UA 1477
United Airlines · Houston to San Antonio
- Route
- IAH → SAT
- Departs
- 18:42
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1477, check with United Airlines.
UA 1477 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 365 flights, with a median arrival 6 minutes early.
The national on-time rate over the same period is 77.3%, so UA 1477 runs 4 points behind the country as a whole. Across a thousand flights that is about 42 extra late arrivals.
Key figures
On time
73.1%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
10.2%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1477 flies
UA 1477 flies IAH to SAT without a single fixed slot. Its most common scheduled departure was 18:42, used on 61 of 365 flights, with 18:30 (56 flights) and 18:35 (52 flights) next.
- Departs 18:4261 flights16.7%
- Departs 18:3056 flights15.3%
- Departs 18:3552 flights14.2%
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 18:42 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1477 runs 5 points better at 73.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 1477 next to IAH to SAT
Every carrier on IAH to SAT combined arrived on time 83.1% of the time across 2,373 flights, so UA 1477 is 10 points behind it. United flew 2,247 flights on the same city pair under all its flight numbers, including this one, and those ran 83.0% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1477 | 365 | 73.1% | 70 min | 0.27% | C+ |
| All United Airlines on IAH–SAT | 2,247 | 83.0% | 58 min | 0.36% | B+ |
| All carriers on IAH–SAT | 2,373 | 83.1% | 58 min | 0.38% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1477 quarter by quarter
UA 1477 did not run the same all year. Its best quarter was Jan–Mar 2026 at 84.3% on time and its weakest Jul–Sep 2026 at 61.3%, a swing of 23 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 flights70.0%
- Oct–Dec 202592 flights73.9%
- Jan–Mar 202690 flights84.3%
- Apr–Jun 202691 flights70.3%
- Jul–Sep 202662 flights61.3%
Scale runs 55% to 90%.
By weekday, UA 1477 did best on Saturday at 78.8% on time and worst on Monday at 59.6%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1477 runs when it is late
UA 1477 often beats the schedule: 91 of 364 completed flights, 25%, arrived 15 minutes or more early. The 98 late arrivals split 39 under half an hour, 22 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early91 flights25.0%
- Within 15 min175 flights48.1%
- 15–29 min late39 flights10.7%
- 30–59 min late22 flights6.0%
- 1–2 hours late17 flights4.7%
- 2+ hours late20 flights5.5%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
14 of 104 late departures made up the time and arrived on time, 13% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for UA 1477
The latest arrival of the period was on 25 October 2025, 6 hours 32 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 25 October 2025 | 6 hours 32 minutes | Extreme weather |
| 9 November 2025 | 5 hours 24 minutes | Late-arriving aircraft |
| 19 June 2026 | 4 hours 13 minutes | Late-arriving aircraft |
| 7 March 2026 | 3 hours 36 minutes | Late-arriving aircraft |
| 27 July 2026 | 3 hours 24 minutes | Carrier |
Delay causes
Why UA 1477 runs late
Late-arriving aircraft accounts for 54% of the 6,826 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Late-arriving aircraft
- 31%Carrier
- 8%Extreme weather
- 7%National Airspace System
54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,826 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 6,826 delay minutes reported on UA 1477.
Cancellations are rare at 0.27%, 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
10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on four other city pairs in the data, including PHX to IAH (55), SNA to IAH (21) and LAX to IAH (18), but none flew often enough under UA 1477 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to SAT only.
One caution: this is a thin sample. 365 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 1477
For a booking, UA 1477 is one of the weaker ways to fly IAH to SAT: 10 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- IAH to SAT, every carrier and departure
- SAT to IAH, the return direction
- United Airlines 1542 on the same route78.2%
- George Bush Intercontinental (IAH) delay statistics
- San Antonio International (SAT) 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.