Flight number record

UA 1859

United Airlines · Houston to Austin

Route: IAH → AUS
Departs: 12:10
Flights: 288
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1859, check with United Airlines.

UA 1859 lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 288 flights, with a median arrival 5 minutes early.

Set against the rest of the country, UA 1859's record is 5 points better than the US average of 77.6%. That gap is worth roughly 51 fewer late arrivals for every thousand flights.

On time

82.7%

Arrivals under 15 minutes late, of 284 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

1.39%

National rate is 1.81%

1 hour+ late

4.9%

National rate is 8.1%

These figures cover 288 flights between July 2025 and June 2026. The median arrival is 5 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 1859 flies

UA 1859 flies IAH to AUS without a single fixed slot. Its most common scheduled departure was 12:10, used on 67 of 288 flights, with 11:55 (50 flights) and 12:05 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:1067 flights23.3%
Departs 11:5550 flights17.4%
Departs 12:0540 flights13.9%

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 12:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1859 runs 4 points better at 82.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1859 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 1859 is 3 points ahead of 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 beats by 4 points.

UA 1859 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1859thin sample	288	82.7%	53 min	1.39%	B
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 1859 quarter by quarter

UA 1859 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.0% on time and its weakest Oct–Dec 2025 at 76.0%, a swing of 17 points on roughly 72 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 202543 flights93.0%
Oct–Dec 202577 flights76.0%
Jan–Mar 202681 flights82.3%
Apr–Jun 202687 flights83.9%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1859 did best on Tuesday at 93.2% on time and worst on Sunday at 72.5%. Each day rests on about 41 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1859 runs late

One category carries most of the weight here. National Airspace System accounts for 46% of the 2,579 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.

National Airspace System
46%
Carrier
27%
Late-arriving aircraft
17%
Extreme weather
10%

46% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,195 minutes out of 2,579, against a national NAS share of 21%. The split is drawn from 2,579 delay minutes reported on UA 1859.

Cancellations sit at 1.39% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.9% land an hour or more behind schedule, against 8.1% 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 same number turns up on seven other city pairs in the data, including PIT to IAH (93), ORD to SNA (49) and AUS to EWR (36), but none flew often enough under UA 1859 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. 288 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 1859

For a booking, read UA 1859 as 82.7% on time with 1.39% cancelled over 288 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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