Flight number record

UA 406

United Airlines · San Francisco to Las Vegas

Route: SFO → LAS
Departs: 20:45
Flights: 340
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 406, check with United Airlines.

UA 406 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 roughly 55 minutes on average. That is a workable record, not a spotless one. That rests on 340 flights, with a median arrival 4 minutes early.

On time

78.5%

Arrivals under 15 minutes late, of 339 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.81%

1 hour+ late

7.7%

National rate is 8.1%

These figures cover 340 flights between July 2025 and June 2026. The median arrival is 4 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 406 flies

UA 406 flies SFO to LAS without a single fixed slot. Its most common scheduled departure was 20:45, used on 97 of 340 flights, with 21:00 (91 flights) and 21:15 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:4597 flights28.5%
Departs 21:0091 flights26.8%
Departs 21:1540 flights11.8%

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 20:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 406 runs 8 points better at 78.5%. 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 406 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 406 is 4 points ahead of 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%, close to this flight's figure.

UA 406 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 406thin sample	340	78.5%	53 min	0.29%	B+
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 406 quarter by quarter

UA 406 did not run the same all year. Its best quarter was Jan–Mar 2026 at 89.7% on time and its weakest Apr–Jun 2026 at 66.3%, a swing of 23 points on roughly 85 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 202591 flights86.8%
Oct–Dec 202575 flights69.3%
Jan–Mar 202687 flights89.7%
Apr–Jun 202687 flights66.3%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 406 did best on Saturday at 88.0% on time and worst on Thursday at 65.3%. Each day rests on about 49 flights, so a gap of 23 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 406 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 3,890 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
47%
National Airspace System
31%
Carrier
22%

47% 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 3,890 reported delay minutes here, that single category outweighs weather by 47 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 3,890 delay minutes reported on UA 406.

Cancellations are rare at 0.29%, 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

7.7% 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.

UA 406 is not only a SFO to LAS flight. It also flew LAS to EWR (322 flights, 85.1% 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. 340 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 406
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
LAS to EWRthin sample	322	85.1%	65 min	1.55%	A

What to do with this

Booking UA 406

For a booking, read UA 406 as 78.5% on time with 0.29% cancelled over 340 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