Carrier route record

F9LAS→SAN

Frontier Airlines · Las Vegas to San Diego

Flights: 389
Period: July 2025 to June 2026
Share of route: 7%
Carriers: 5

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

Frontier on LAS to SAN sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 389 flights. The strongest carrier on the route with a full sample, SkyWest Airlines, flew 1,492 at 74.6% on time.

The national on-time rate over the same period is 77.6%, so Frontier on LAS to SAN runs 9 points behind the country as a whole. Across a thousand flights that is about 94 extra late arrivals.

On time

68.2%

Arrivals under 15 minutes late, of 384 completed flights

Avg delay

91 min

Across delayed arrivals only, not all flights

Cancelled

1.29%

National rate is 1.81%

Whole route

66.7%

Every carrier on LAS to SAN, 5,877 flights

These figures cover 389 flights between July 2025 and June 2026. Beyond the headline rate, 13.3% 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.

Carrier by carrier

Frontier against every carrier on LAS to SAN

Frontier flew 389 of the 5,877 flights on LAS to SAN, about 7% of it. Its 68.2% on time is 2 points better than the route as a whole, which runs 66.7%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Alaska at 100.0% to Southwest at 62.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 74.6% of the time; Southwest Airlines manages 62.5%. Sample sizes sit next to every figure, because a two-point gap across 3,738 flights means less than a ten-point one.

On-time performance by carrier on LAS to SAN
Airline	Flights	On time	Avg delay	Cancelled	Grade
Alaska Airlinesthin sample	1	100.0%	—	0.00%	A+
Spirit Airlinesthin sample	257	78.7%	72 min	1.17%	B
SkyWest Airlines	1,492	74.6%	63 min	1.34%	C
Frontier Airlines (this page)	389	68.2%	91 min	1.29%	C
Southwest Airlines	3,738	62.5%	50 min	0.99%	D+

The spread between SkyWest and Southwest is 12 points, wide enough that it should decide the booking. On a hundred trips that is 12 more arrivals inside the on-time window.

Departure window

When Frontier runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against 12 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am36 flights80.6%
8am–11am72 flights58.0%
11am–2pm79 flights65.8%
2pm–5pm55 flights59.3%
5pm–8pm65 flights72.3%
8pm–5am82 flights76.5%

Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 80.6% of the time, against 58.0% for the morning window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 82 flights scheduled in it.

Across the year

Frontier on LAS to SAN through the year

Jul–Sep 2025141 flights65.0%
Oct–Dec 202593 flights63.0%
Jan–Mar 202667 flights85.1%
Apr–Jun 202688 flights65.9%

Scale runs 55% to 90%. 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 68.2% on time across 389 flights.

Frontier on LAS to SAN did not run the same all year. Its best quarter was Jan–Mar 2026 at 85.1% on time and its weakest Oct–Dec 2025 at 63.0%, a swing of 22 points on roughly 97 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.

Across the week, Wednesday is the strongest day at 85.7% on time and Monday the weakest at 60.6%. 25 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Frontier runs late on this route

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 11,000 reported delay minutes.

Late-arriving aircraft
36%
National Airspace System
31%
Carrier
30%
Extreme weather
2%

36% 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 11,000 reported delay minutes here, that single category outweighs weather by 18 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 11,150 reported delay minutes.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 80.6% on time here.

Cancellations sit at 1.29% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 258 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 5am–8am window matters as much as it does.

The return leg runs 66.6% on time across 389 flights, within 2 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. 389 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 Frontier on LAS to SAN

Put together: treat all of this as provisional. 389 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 68.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 384 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