Flight number record

UA 751

United Airlines · San Francisco to Las Vegas

Route: SFO → LAS
Departs: 16:55
Flights: 316
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 751, check with United Airlines.

UA 751 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land roughly 55 minutes behind schedule. That rests on 316 flights, with a median arrival right on schedule.

The national on-time rate over the same period is 77.6%, so UA 751 runs 7 points behind the country as a whole. Across a thousand flights that is about 70 extra late arrivals.

On time

70.6%

Arrivals under 15 minutes late, of 313 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

0.63%

National rate is 1.81%

1 hour+ late

8.9%

National rate is 8.1%

These figures cover 316 flights between July 2025 and June 2026. Beyond the headline rate, 8.9% 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 751 flies

UA 751 flies SFO to LAS without a single fixed slot. Its most common scheduled departure was 16:55, used on 86 of 316 flights, with 16:48 (56 flights) and 16:45 (54 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:5586 flights27.2%
Departs 16:4856 flights17.7%
Departs 16:4554 flights17.1%

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 16:55 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 751 runs level with that at 70.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 751 next to SFO to LAS

Every carrier on SFO to LAS combined arrived on time 74.1% of the time across 6,066 flights, so UA 751 is 4 points behind it. United flew 2,757 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 8 points.

UA 751 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 751thin sample	316	70.6%	54 min	0.63%	C+
All United Airlines on SFO–LAS	2,757	79.6%	55 min	0.36%	B+
All carriers on SFO–LAS	6,066	74.1%	67 min	0.61%	C+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 751 quarter by quarter

UA 751 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.0% on time and its weakest Apr–Jun 2026 at 65.6%, a swing of 14 points on roughly 79 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 202543 flights67.4%
Oct–Dec 202592 flights67.8%
Jan–Mar 202690 flights80.0%
Apr–Jun 202691 flights65.6%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 751 did best on Saturday at 84.1% on time and worst on Thursday at 59.1%. Each day rests on about 45 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 751 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 52% of the 4,940 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
52%
National Airspace System
29%
Carrier
19%

52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,940 reported delay minutes here, that single category outweighs weather by 52 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,940 delay minutes reported on UA 751.

Cancellations are rare at 0.63%, 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

8.9% 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 roughly 55 minutes, which a normal layover absorbs.

The same number turns up on three other city pairs in the data, including PDX to SFO (53), DEN to SEA (34) and LAS to ORD (2), but none flew often enough under UA 751 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to LAS only.

One caution: this is a thin sample. 316 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 751

For a booking, read UA 751 as 70.6% on time with 0.63% cancelled over 316 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