Flight number record

UA 2435

United Airlines · Washington to Sacramento

Route: IAD → SMF
Departs: 17:55
Flights: 349
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2435, check with United Airlines.

UA 2435 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 349 flights, with a median arrival 7 minutes early.

On time

78.6%

Arrivals under 15 minutes late, of 345 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

1.15%

National rate is 1.81%

1 hour+ late

7.8%

National rate is 8.1%

These figures cover 349 flights between July 2025 and June 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.

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 155 of 349 flights, with 18:45 (50 flights) and 19:19 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:55155 flights44.4%
Departs 18:4550 flights14.3%
Departs 19:1937 flights10.6%

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 2435 runs 10 points better at 78.6%. 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 2435 next to IAD to SMF

Every carrier on IAD to SMF combined arrived on time 77.8% of the time across 365 flights, so UA 2435 is about level with it. Across its whole network United Airlines managed 79.0%, close to this flight's figure.

UA 2435 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2435thin sample	349	78.6%	65 min	1.15%	B
All United Airlines on IAD–SMF	365	77.8%	62 min	1.10%	B
All carriers on IAD–SMF	365	77.8%	62 min	1.10%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2435 quarter by quarter

UA 2435 did not run the same all year. Its best quarter was Oct–Dec 2025 at 84.2% on time and its weakest Jul–Sep 2025 at 68.5%, a swing of 16 points on roughly 87 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 202592 flights68.5%
Oct–Dec 202576 flights84.2%
Jan–Mar 202690 flights80.9%
Apr–Jun 202691 flights81.8%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2435 ranged from 72.9% on Wednesday to 84.0% on Tuesday. With about 50 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.

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 4,773 reported delay minutes.

Late-arriving aircraft
36%
Carrier
34%
National Airspace System
19%
Extreme weather
12%

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 1.9 times the usual weather exposure. The split is drawn from 4,773 delay minutes reported on UA 2435.

Cancellations sit at 1.15% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

7.8% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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, 84.4% 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. 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.

Other routes flown as UA 2435
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
MIA to IADthin sample	328	84.4%	91 min	0.30%	B+

What to do with this

Booking UA 2435

For a booking, read UA 2435 as 78.6% on time with 1.15% cancelled over 349 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