Flight number record

UA 1723

United Airlines · San Francisco to Kailua-Kona

Route: SFO → KOA
Departs: 16:55
Flights: 278
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1723, check with United Airlines.

UA 1723 lands a B+, 2 points 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 35 minutes on average. That is a workable record, not a spotless one. That rests on 278 flights, with a median arrival 1 minute early.

On time

79.7%

Arrivals under 15 minutes late, of 276 completed flights

Avg delay

34 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 278 flights between July 2025 and June 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.

Schedule

When UA 1723 flies

UA 1723 flies SFO to KOA without a single fixed slot. Its most common scheduled departure was 16:55, used on 194 of 278 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:55194 flights69.8%

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 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 1723 runs 7 points better at 79.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1723 next to SFO to KOA

Every carrier on SFO to KOA combined arrived on time 86.3% of the time across 1,080 flights, so UA 1723 is 7 points behind it. United flew 862 flights on the same city pair under all its flight numbers, including this one, and those ran 85.4% on time. Across its whole network United Airlines managed 79.0%, close to this flight's figure.

UA 1723 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1723thin sample	278	79.7%	34 min	0.36%	B+
All United Airlines on SFO–KOA	862	85.4%	50 min	0.35%	A+
All carriers on SFO–KOA	1,080	86.3%	52 min	0.28%	A+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1723 quarter by quarter

Quarter by quarter UA 1723 held fairly steady: 76.9% in Jul–Sep 2025, 79.1% in Oct–Dec 2025, 78.4% in Jan–Mar 2026 and 83.5% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights76.9%
Oct–Dec 202543 flights79.1%
Jan–Mar 202652 flights78.4%
Apr–Jun 202691 flights83.5%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1723 did best on Saturday at 95.0% on time and worst on Wednesday at 63.2%. Each day rests on about 40 flights, so a gap of 32 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1723 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 1,894 reported delay minutes.

Carrier
36%
National Airspace System
33%
Late-arriving aircraft
31%

The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 677 of the 1,894 delay minutes reported here. The split is drawn from 1,894 delay minutes reported on UA 1723.

Cancellations are rare at 0.36%, 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

Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

At 2,368 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 IDA to DEN (36), IAH to ATL (15) and PHX to ORD (6), but none flew often enough under UA 1723 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to KOA only.

One caution: this is a thin sample. 278 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 1723

For a booking, UA 1723 is one of the weaker ways to fly SFO to KOA: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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