Flight number record

UA 326

United Airlines · Washington to Seattle

Route: IAD → SEA
Departs: 17:55
Flights: 281
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 326, check with United Airlines.

UA 326 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 281 flights, with a median arrival right on schedule.

On time

74.6%

Arrivals under 15 minutes late, of 279 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

National rate is 1.81%

1 hour+ late

10.8%

National rate is 8.1%

These figures cover 281 flights between July 2025 and June 2026. Beyond the headline rate, 10.8% 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 326 flies

UA 326 is scheduled to leave Washington (IAD) at 17:55 local time and reach Seattle (SEA) at 20:53. That slot held for 281 of the 281 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 17:55281 flights100.0%

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 17:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 326 runs 6 points better at 74.6%. 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 326 next to IAD to SEA

Every carrier on IAD to SEA combined arrived on time 76.6% of the time across 1,884 flights, so UA 326 is 2 points behind it. United flew 688 flights on the same city pair under all its flight numbers, including this one, and those ran 79.7% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 4 points.

UA 326 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 326thin sample	281	74.6%	70 min	0.36%	C+
All United Airlines on IAD–SEA	688	79.7%	62 min	0.58%	B+
All carriers on IAD–SEA	1,884	76.6%	63 min	1.01%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 326 quarter by quarter

Quarter by quarter UA 326 held fairly steady: 69.2% in Jul–Sep 2025, 76.3% in Oct–Dec 2025 and 78.3% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights69.2%
Oct–Dec 202576 flights76.3%
Jan–Mar 202629 flights—
Apr–Jun 202684 flights78.3%

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

By weekday, UA 326 ranged from 70.7% on Friday to 76.5% on Saturday. With about 40 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 326 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 4,978 reported delay minutes.

Carrier
41%
National Airspace System
32%
Extreme weather
16%
Late-arriving aircraft
11%

Extreme weather accounts for 16% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.5 times the usual weather exposure. The split is drawn from 4,978 delay minutes reported on UA 326.

Cancellations are rare at 0.36%, 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. 10.8% 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.

At 2,305 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The same number turns up on seven other city pairs in the data, including TPA to IAD (229), DEN to IAD (24) and DEN to TPA (15), but none flew often enough under UA 326 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to SEA only.

One caution: this is a thin sample. 281 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 326

For a booking, read UA 326 as 74.6% on time with 0.36% cancelled over 281 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