Flight number record

UA 1477

United Airlines · Houston to San Antonio

Route: IAH → SAT
Departs: 18:30
Flights: 334
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 3 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 334 flights, with a median arrival 6 minutes early.

On time

74.2%

Arrivals under 15 minutes late, of 333 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

0.30%

National rate is 1.81%

1 hour+ late

10.2%

National rate is 8.1%

These figures cover 334 flights between July 2025 and June 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When UA 1477 flies

UA 1477 flies IAH to SAT without a single fixed slot. Its most common scheduled departure was 18:30, used on 56 of 334 flights, with 18:45 (53 flights) and 18:35 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:3056 flights16.8%
Departs 18:4553 flights15.9%
Departs 18:3552 flights15.6%

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 18:30 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 1477 runs 6 points better at 74.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 1477 next to IAH to SAT

Every carrier on IAH to SAT combined arrived on time 82.4% of the time across 2,411 flights, so UA 1477 is 8 points behind it. United flew 2,326 flights on the same city pair under all its flight numbers, including this one, and those ran 82.6% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 5 points.

UA 1477 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1477thin sample	334	74.2%	71 min	0.30%	C+
All United Airlines on IAH–SAT	2,326	82.6%	62 min	0.47%	B+
All carriers on IAH–SAT	2,411	82.4%	63 min	0.50%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	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 2025 at 65.6%, a swing of 19 points on roughly 84 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 202561 flights65.6%
Oct–Dec 202592 flights73.9%
Jan–Mar 202690 flights84.3%
Apr–Jun 202691 flights70.3%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1477 did best on Tuesday at 81.2% on time and worst on Monday at 59.6%. Each day rests on about 48 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1477 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 6,135 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
52%
Carrier
32%
Extreme weather
9%
National Airspace System
7%

52% 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 6,135 reported delay minutes here, that single category outweighs weather by 6 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 6,135 delay minutes reported on UA 1477.

Cancellations are rare at 0.30%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 (117), ORD to PHX (60) and IAH to BNA (31), 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. 334 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: 8 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.

Where to go next

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.

Key figures