Carrier route record

F9LAS→SJC

Frontier Airlines · Las Vegas to San Jose

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 LAS to SJC lands a B, 3 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 about an hour on average. That is a workable record, not a spotless one. That rests on 185 flights, with a median arrival 10 minutes early.

The US average over the same twelve months is 77.6%, so there is little to separate Frontier on LAS to SJC from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

80.2%

Arrivals under 15 minutes late, of 182 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

1.62%

National rate is 1.81%

Whole route

78.3%

Every carrier on LAS to SJC, 3,844 flights

These figures cover 185 flights between July 2025 and June 2026. The median arrival is 10 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

Frontier against every carrier on LAS to SJC

Frontier flew 185 of the 3,844 flights on LAS to SJC, about 5% of it. Its 80.2% on time is 2 points better than the route as a whole, which runs 78.3%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from United at 100.0% to Southwest at 77.9%. 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 LAS to SJC
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlinesthin sample	4	100.0%	—	0.00%	A+
Spirit Airlinesthin sample	198	81.2%	50 min	0.51%	B+
SkyWest Airlinesthin sample	202	81.2%	100 min	0.00%	B+
Frontier Airlines (this page)thin sample	185	80.2%	63 min	1.62%	B
Southwest Airlines	3,255	77.9%	52 min	0.34%	B+

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–8am18 flights—
8am–11am3 flights—
11am–2pm53 flights78.4%
2pm–5pm86 flights80.0%
5pm–8pm25 flights—
8pm–5am—

Scale runs 70% to 85%. Rows with fewer than 30 flights show a dash.

The 2pm–5pm window is the strongest at 80.0% on time. The full set of windows spans 2 points.

Across the year

Frontier on LAS to SJC through the year

Jul–Sep 202544 flights71.4%
Oct–Dec 202531 flights80.6%
Jan–Mar 202650 flights85.7%
Apr–Jun 202660 flights81.7%

Scale runs 65% 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 80.2% on time across 185 flights.

Frontier on LAS to SJC did not run the same all year. Its best quarter was Jan–Mar 2026 at 85.7% on time and its weakest Jul–Sep 2025 at 71.4%, a swing of 14 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 82.6% on time and Monday the weakest at 76.7%. 6 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 74% of the 2,282 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
74%
Carrier
20%
National Airspace System
6%
Extreme weather
1%

74% 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 2,282 reported delay minutes here, that single category outweighs weather by 74 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 2,282 reported delay minutes.

Cancellations sit at 1.62% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

6.6% 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 about an hour, which a normal layover absorbs.

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 2pm–5pm window matters as much as it does.

The return leg is a different operation and performs like one: it runs 72.4% on time across 185 flights, 8 points below 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 LAS to SJC

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 80.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 182 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