Carrier route record

UALAX→SAN

United Airlines · Los Angeles to San Diego

Flights: 188
Period: July 2025 to June 2026
Share of route: 8%
Carriers: 2

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

United on LAX to SAN earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 45 minutes. That rests on 188 flights, with a median arrival 7 minutes early.

Set against the rest of the country, United's LAX to SAN record is 12 points better than the US average of 77.6%. That gap is worth roughly 118 fewer late arrivals for every thousand flights.

On time

89.4%

Arrivals under 15 minutes late, of 188 completed flights

Avg delay

46 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

86.7%

Every carrier on LAX to SAN, 2,441 flights

These figures cover 188 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.

Carrier by carrier

United against every carrier on LAX to SAN

United flew 188 of the 2,441 flights on LAX to SAN, about 8% of it. Its 89.4% on time is 3 points better than the route as a whole, which runs 86.7%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from United at 89.4% to SkyWest at 86.5%.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on LAX to SAN
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines (this page)thin sample	188	89.4%	46 min	0.00%	A+
SkyWest Airlines	2,253	86.5%	65 min	1.02%	A

Departure window

When United runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 188 flights.

5am–8am—
8am–11am—
11am–2pm—
2pm–5pm3 flights—
5pm–8pm82 flights85.4%
8pm–5am103 flights92.2%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

The 8pm–5am window is the strongest at 92.2% on time. The full set of windows spans 7 points.

Across the year

United on LAX to SAN through the year

Jul–Sep 20256 flights—
Oct–Dec 202510 flights—
Jan–Mar 202661 flights85.2%
Apr–Jun 2026111 flights91.0%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 89.4% on time across 188 flights.

Split by quarter, United on LAX to SAN logged 6 flights in Jul–Sep 2025, 10 flights in Oct–Dec 2025, 61 flights in Jan–Mar 2026 and 111 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 89.4% annual figure is the one to use.

Across the week, Friday is the strongest day at 93.9% on time and Sunday the weakest at 83.9%. 10 points is a smaller lever than departure hour, but it is free.

Delay causes

Why United runs late on this route

One category carries most of the weight here. National Airspace System accounts for 48% of the 917 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.

National Airspace System
48%
Late-arriving aircraft
27%
Carrier
25%

48% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 439 minutes out of 917, against a national NAS share of 21%. The split is drawn from 917 reported delay minutes.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 3.2% 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 109 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8pm–5am window matters as much as it does.

The return leg runs 92.0% on time across 187 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 188 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 United on LAX to SAN

Put together: treat all of this as provisional. 188 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 89.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 188 completed flights over 12 months sit behind that.

Where to go next

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