Flight number record
UA 2435
United Airlines · Washington to Sacramento
- Route
- IAD → SMF
- Departs
- 17:55
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2435, check with United Airlines.
UA 2435 lands a B, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 349 flights, with a median arrival 7 minutes early.
Key figures
On time
80.8%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
1.43%
National rate is 1.89%
1 hour+ late
7.0%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 7 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.
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Schedule
When UA 2435 flies
UA 2435 flies IAD to SMF without a single fixed slot. Its most common scheduled departure was 17:55, used on 196 of 349 flights, with 19:39 (36 flights) next.
- Departs 17:55196 flights56.2%
- Departs 19:3936 flights10.3%
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 2435 runs 13 points better at 80.8%. 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 2435 next to IAD to SMF
Every carrier on IAD to SMF combined arrived on time 80.0% of the time across 365 flights, so UA 2435 is about level with it. Across its whole network United Airlines managed 78.8%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2435thin sample | 349 | 80.8% | 60 min | 1.43% | B |
| All United Airlines on IAD–SMF | 365 | 80.0% | 58 min | 1.37% | B |
| All carriers on IAD–SMF | 365 | 80.0% | 58 min | 1.37% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2435 quarter by quarter
UA 2435 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 72.1%, a swing of 15 points on roughly 70 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 flights86.7%
- Oct–Dec 202576 flights84.2%
- Jan–Mar 202690 flights80.9%
- Apr–Jun 202691 flights81.8%
- Jul–Sep 202662 flights72.1%
Scale runs 65% to 90%.
By weekday, UA 2435 ranged from 76.5% on Monday to 83.7% on Tuesday. With about 50 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2435 runs when it is late
UA 2435 often beats the schedule: 123 of 344 completed flights, 36%, arrived 15 minutes or more early. The 66 late arrivals split 18 under half an hour, 24 between 30 and 60 minutes, and 24 an hour or more.
- 15+ min early123 flights35.8%
- Within 15 min155 flights45.1%
- 15–29 min late18 flights5.2%
- 30–59 min late24 flights7.0%
- 1–2 hours late18 flights5.2%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 344 completed flights by arrival against schedule.
10 of 56 late departures made up the time and arrived on time, 18% of them. In the other direction, 20 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 SMF.
The worst days
Worst days for UA 2435
The latest arrival of the period was on 7 March 2026, 4 hours 35 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 4 hours 35 minutes | Late-arriving aircraft |
| 22 February 2026 | 2 hours 57 minutes | National Airspace System |
| 13 March 2026 | 2 hours 52 minutes | National Airspace System |
| 10 August 2026 | 2 hours 42 minutes | Late-arriving aircraft |
| 6 September 2025 | 2 hours 40 minutes | Late-arriving aircraft |
Delay causes
Why UA 2435 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 3,981 reported delay minutes.
- 33%Carrier
- 28%National Airspace System
- 26%Late-arriving aircraft
- 12%Extreme weather
Extreme weather accounts for 12% 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 2.0 times the usual weather exposure. The split is drawn from 3,981 delay minutes reported on UA 2435.
Cancellations sit at 1.43% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
7.0% 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 2,357 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.
UA 2435 is not only a IAD to SMF flight. It also flew MIA to IAD (328 flights, 87.7% 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. 349 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MIA to IADthin sample | 328 | 87.7% | 80 min | 0.30% | A+ |
What to do with this
Booking UA 2435
For a booking, read UA 2435 as 80.8% on time with 1.43% cancelled over 349 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Washington Dulles International (IAD) delay statistics
- Sacramento International (SMF) 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.