Flight number record
UA 326
United Airlines · Washington to Seattle
- Route
- IAD → SEA
- Departs
- 17:55
- Flights
- 254
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 326, check with United Airlines.
UA 326 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 254 flights, with a median arrival 1 minute early.
Key figures
On time
76.2%
Arrivals under 15 minutes late, of 252 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.79%
National rate is 1.89%
1 hour+ late
7.1%
National rate is 8.3%
These figures cover 254 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 326 flies
UA 326 is scheduled to leave Washington (IAD) at 17:55 local time and reach Seattle (SEA) at 20:46. That slot held for 254 of the 254 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 17:55254 flights100.0%
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 17:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 326 runs 8 points better at 76.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 326 next to IAD to SEA
Every carrier on IAD to SEA combined arrived on time 77.7% of the time across 1,821 flights, so UA 326 is 2 points behind it. United flew 625 flights on the same city pair under all its flight numbers, including this one, and those ran 81.3% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 326thin sample | 254 | 76.2% | 64 min | 0.79% | B+ |
| All United Airlines on IAD–SEA | 625 | 81.3% | 66 min | 0.48% | B+ |
| All carriers on IAD–SEA | 1,821 | 77.7% | 64 min | 0.99% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 326 quarter by quarter
UA 326 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 58.8%, a swing of 31 points on roughly 64 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 202576 flights76.3%
- Jan–Mar 202629 flights—
- Apr–Jun 202684 flights78.3%
- Jul–Sep 202635 flights58.8%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 326 ranged from 70.0% on Monday to 81.6% on Sunday. With about 36 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 326 runs when it is late
UA 326 often beats the schedule: 65 of 252 completed flights, 26%, arrived 15 minutes or more early. The 60 late arrivals split 27 under half an hour, 15 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early65 flights25.8%
- Within 15 min127 flights50.4%
- 15–29 min late27 flights10.7%
- 30–59 min late15 flights6.0%
- 1–2 hours late10 flights4.0%
- 2+ hours late8 flights3.2%
Scale runs 0% to 100%.
Share of 252 completed flights by arrival against schedule.
9 of 41 late departures made up the time and arrived on time, 22% of them. In the other direction, 28 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 SEA.
The worst days
Worst days for UA 326
The latest arrival of the period was on 5 July 2026, 6 hours 30 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across July, June, August and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 July 2026 | 6 hours 30 minutes | National Airspace System |
| 11 June 2026 | 5 hours 45 minutes | Carrier |
| 10 August 2026 | 3 hours 9 minutes | Late-arriving aircraft |
| 10 June 2026 | 2 hours 54 minutes | Extreme weather |
| 28 October 2025 | 2 hours 53 minutes | Carrier |
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 3,830 reported delay minutes.
- 42%National Airspace System
- 40%Carrier
- 10%Extreme weather
- 8%Late-arriving aircraft
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,546 of the 3,830 delay minutes reported here. The split is drawn from 3,830 delay minutes reported on UA 326.
Cancellations are rare at 0.79%, 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
7.1% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 eight other city pairs in the data, including TPA to IAD (185), DEN to IAD (24) and IAH to SNA (21), 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. 254 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 76.2% on time with 0.79% cancelled over 254 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAD to SEA, every carrier and departure
- SEA to IAD, the return direction
- Delta Air Lines 1015 on the same route77.0%
- Washington Dulles International (IAD) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.