Flight number record

UA 2366

United Airlines · Houston to Washington

Route: IAH → IAD
Departs: 12:10
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2366, check with United Airlines.

UA 2366 lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That rests on 365 flights, with a median arrival 1 minute early.

Set against the rest of the country, UA 2366's record is 5 points better than the US average of 77.3%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.

On time

82.0%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.89%

1 hour+ late

4.7%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

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Schedule

When UA 2366 flies

UA 2366 flies IAH to IAD without a single fixed slot. Its most common scheduled departure was 12:10, used on 88 of 365 flights, with 12:13 (82 flights) and 12:15 (42 flights) next.

Departs 12:1088 flights24.1%
Departs 12:1382 flights22.5%
Departs 12:1542 flights11.5%

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 12:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 2366 runs 4 points better at 82.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

UA 2366 next to IAH to IAD

Every carrier on IAH to IAD combined arrived on time 82.4% of the time across 1,860 flights, so UA 2366 is about level with it. Across its whole network United Airlines managed 78.8%, which this flight beats by 3 points.

UA 2366 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2366	365	82.0%	54 min	0.27%	B+
All United Airlines on IAH–IAD	1,860	82.4%	62 min	0.43%	B+
All carriers on IAH–IAD	1,860	82.4%	62 min	0.43%	B+
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 2366 quarter by quarter

UA 2366 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 78.7%, a swing of 11 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 flights90.0%
Oct–Dec 202592 flights85.9%
Jan–Mar 202690 flights78.7%
Apr–Jun 202691 flights80.2%
Jul–Sep 202662 flights80.0%

Scale runs 70% to 95%.

By weekday, UA 2366 ranged from 78.4% on Sunday to 88.5% on Tuesday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late UA 2366 runs when it is late

The 65 late arrivals split 30 under half an hour, 18 between 30 and 60 minutes, and 17 an hour or more.

15+ min early44 flights12.2%
Within 15 min253 flights69.9%
15–29 min late30 flights8.3%
30–59 min late18 flights5.0%
1–2 hours late13 flights3.6%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

A late pushback is often recovered here: of 62 departures that left 15 minutes late or more, 22 still arrived on time. In the other direction, 25 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at IAD.

The worst days

Worst days for UA 2366

The latest arrival of the period was on 21 July 2026, 9 hours 14 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across July, October, June and March, with no single month standing out.

The latest arrivals of UA 2366 in the period
Date	Arrived late by	Largest filed cause
21 July 2026	9 hours 14 minutes	National Airspace System
5 October 2025	3 hours 18 minutes	Carrier
15 June 2026	2 hours 38 minutes	Extreme weather
20 March 2026	2 hours 34 minutes	Late-arriving aircraft
18 July 2026	1 hour 50 minutes	Carrier

Delay causes

Why UA 2366 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 3,492 reported delay minutes.

National Airspace System
41%
Carrier
30%
Late-arriving aircraft
21%
Extreme weather
9%

41% 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 1,419 minutes out of 3,492, against a national NAS share of 21%. The split is drawn from 3,492 delay minutes reported on UA 2366.

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

Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% 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 1,190 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.

UA 2366 is not only a IAH to IAD flight. It also flew SLC to IAH (311 flights, 94.4% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

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.

Other routes flown as UA 2366
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SLC to IAHthin sample	311	94.4%	96 min	1.61%	A

What to do with this

Booking UA 2366

For a booking, read UA 2366 as 82.0% on time with 0.27% cancelled over 365 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures