Flight number record

UA 2621

United Airlines · Houston to Austin

Route: IAH → AUS
Departs: 20:25
Flights: 325
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2621, check with United Airlines.

UA 2621 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 325 flights, with a median arrival 2 minutes early.

The national on-time rate over the same period is 77.6%, so UA 2621 runs 6 points behind the country as a whole. Across a thousand flights that is about 55 extra late arrivals.

On time

72.1%

Arrivals under 15 minutes late, of 323 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.81%

1 hour+ late

12.1%

National rate is 8.1%

These figures cover 325 flights between July 2025 and June 2026. Beyond the headline rate, 12.1% 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 2621 flies

UA 2621 flies IAH to AUS without a single fixed slot. Its most common scheduled departure was 20:25, used on 63 of 325 flights, with 20:10 (48 flights) and 20:20 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:2563 flights19.4%
Departs 20:1048 flights14.8%
Departs 20:2045 flights13.8%

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 20:25 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 2621 runs level with that at 72.1%. 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 2621 next to IAH to AUS

Every carrier on IAH to AUS combined arrived on time 79.4% of the time across 2,675 flights, so UA 2621 is 7 points behind it. United flew 2,609 flights on the same city pair under all its flight numbers, including this one, and those ran 79.4% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 7 points.

UA 2621 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2621thin sample	325	72.1%	69 min	0.31%	C+
All United Airlines on IAH–AUS	2,609	79.4%	65 min	0.80%	B+
All carriers on IAH–AUS	2,675	79.4%	66 min	0.79%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2621 quarter by quarter

UA 2621 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.8% on time and its weakest Oct–Dec 2025 at 68.9%, a swing of 12 points on roughly 81 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 202591 flights72.5%
Oct–Dec 202590 flights68.9%
Jan–Mar 202653 flights80.8%
Apr–Jun 202691 flights70.0%

Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2621 did best on Tuesday at 84.8% on time and worst on Saturday at 59.6%. Each day rests on about 46 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 2621 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 55% of the 6,168 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
55%
Carrier
30%
National Airspace System
11%
Extreme weather
5%

55% 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 6,168 reported delay minutes here, that single category outweighs weather by 12 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 6,168 delay minutes reported on UA 2621.

Cancellations are rare at 0.31%, 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. 12.1% 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 seven other city pairs in the data, including ORD to IAH (68), SFO to IAH (37) and SJC to ORD (31), but none flew often enough under UA 2621 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to AUS only.

One caution: this is a thin sample. 325 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 2621

For a booking, UA 2621 is a flight to put a long connection behind. 12.1% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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