Carrier route record

F9SJC→LAS

Frontier Airlines · San Jose to Las Vegas

Flights: 185
Period: July 2025 to June 2026
Share of route: 5%
Carriers: 5

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

Frontier on SJC to LAS sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 185 flights, with a median arrival 4 minutes early.

The national on-time rate over the same period is 77.6%, so Frontier on SJC to LAS runs 5 points behind the country as a whole. Across a thousand flights that is about 52 extra late arrivals.

On time

72.4%

Arrivals under 15 minutes late, of 181 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

2.16%

National rate is 1.81%

Whole route

79.7%

Every carrier on SJC to LAS, 3,829 flights

These figures cover 185 flights between July 2025 and June 2026. Beyond the headline rate, 9.9% 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.

Carrier by carrier

Frontier against every carrier on SJC to LAS

Frontier flew 185 of the 3,829 flights on SJC to LAS, about 5% of it. Its 72.4% on time is 7 points worse than the route as a whole, which runs 79.7%. Ranked by on-time rate it is last of five carriers on the route, where the range runs from United at 100.0% to Frontier at 72.4%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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 SJC to LAS
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlinesthin sample	2	100.0%	—	0.00%	A+
Spirit Airlinesthin sample	199	86.8%	82 min	0.50%	A+
SkyWest Airlinesthin sample	202	80.2%	79 min	0.00%	B+
Southwest Airlines	3,241	79.6%	55 min	0.46%	B+
Frontier Airlines (this page)thin sample	185	72.4%	62 min	2.16%	C

Departure window

When Frontier 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 185 flights.

5am–8am—
8am–11am22 flights—
11am–2pm15 flights—
2pm–5pm63 flights68.9%
5pm–8pm62 flights69.4%
8pm–5am23 flights—

Scale runs 60% to 75%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is the strongest at 69.4% on time. The full set of windows spans half a point.

Across the year

Frontier on SJC to LAS through the year

Jul–Sep 202544 flights59.5%
Oct–Dec 202531 flights77.4%
Jan–Mar 202650 flights80.0%
Apr–Jun 202660 flights72.4%

Scale runs 50% to 85%. 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 72.4% on time across 185 flights.

Frontier on SJC to LAS did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.0% on time and its weakest Jul–Sep 2025 at 59.5%, a swing of 21 points on roughly 46 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, Friday is the strongest day at 77.8% on time and Thursday the weakest at 61.9%. 16 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 64% of the 3,075 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
64%
National Airspace System
26%
Carrier
10%

64% 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 3,075 reported delay minutes here, that single category outweighs weather by 64 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 3,075 reported delay minutes.

Cancellations sit at 2.16% 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. 9.9% 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 386 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 5pm–8pm window matters as much as it does.

The return leg is a different operation and performs like one: it runs 80.2% on time across 185 flights, 8 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 8 points of difference.

One caution: this is a thin sample. 185 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 SJC to LAS

Put together: treat all of this as provisional. 185 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 72.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 181 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