Carrier route record
F9LAS→SFO
Frontier Airlines · Las Vegas to San Francisco
- Flights
- 875
- Period
- July 2025 to June 2026
- Share of route
- 14%
- 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 SFO draws a D. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 875 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,756 at 67.5% on time.
United Airlines is the most reliable of the three carriers covered here at 67.5% on time across 2,756 flights.
Key figures
On time
64.3%
Arrivals under 15 minutes late, of 863 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.81%
Whole route
62.8%
Every carrier on LAS to SFO, 6,060 flights
These figures cover 875 flights between July 2025 and June 2026. Beyond the headline rate, 13.6% 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 SFO
Frontier flew 875 of the 6,060 flights on LAS to SFO, about 14% of it. Its 64.3% on time is 2 points better than the route as a whole, which runs 62.8%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from SkyWest at 100.0% to Southwest at 48.8%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. United Airlines arrives on time 67.5% of the time; Southwest Airlines manages 48.8%. Sample sizes sit next to every figure, because a two-point gap across 1,310 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlinesthin sample | 3 | 100.0% | — | 0.00% | A+ |
| United Airlines | 2,756 | 67.5% | 61 min | 0.44% | C+ |
| Alaska Airlines | 1,116 | 66.5% | 52 min | 1.08% | C |
| Frontier Airlines (this page) | 875 | 64.3% | 70 min | 1.37% | D |
| Southwest Airlines | 1,310 | 48.8% | 54 min | 0.38% | F+ |
The spread between United and Southwest is 19 points, wide enough that it should decide the booking. On a hundred trips that is 19 more arrivals inside the on-time window.
Flight by flight
Frontier flight numbers on LAS to SFO
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 28 points, against 19 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am180 flights77.7%
- 8am–11am149 flights52.3%
- 11am–2pm127 flights72.2%
- 2pm–5pm170 flights67.1%
- 5pm–8pm213 flights56.9%
- 8pm–5am36 flights50.0%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 50.0% on time, against 77.7% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 213 flights scheduled in it.
Across the year
Frontier on LAS to SFO through the year
Delays peak in November, when the on-time rate falls to 51.5%. March is the strongest month at 90.0%. Moving a flexible trip across that boundary buys 39 points. May was the busiest month here, with 86 flights.
Across the week, Saturday is the strongest day at 78.4% on time and Friday the weakest at 58.4%. 20 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. National Airspace System accounts for 49% of the 22,000 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.
- 49%National Airspace System
- 33%Late-arriving aircraft
- 17%Carrier
49% 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 11,000 minutes out of 22,000, against a national NAS share of 21%. The split is drawn from 21,561 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 77.7% on time here.
Cancellations sit at 1.37% 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. 13.6% 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 414 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 65.6% on time across 879 flights, within about a point 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. 875 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 SFO
Put together: treat all of this as provisional. 875 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 64.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 863 completed flights over 12 months sit behind that.
Related
Where to go next
- LAS to SFO, every carrier
- Frontier on SFO to LAS, the return leg
- United Airlines on LAS to SFO67.5%
- Alaska Airlines on LAS to SFO66.5%
- Southwest Airlines on LAS to SFO48.8%
- Frontier Airlines network-wide record
- Harry Reid International (LAS) delay statistics
- San Francisco International (SFO) delay statistics
- Same route, different airline: where the carrier you pick matters most
- Why the first flight of the morning is statistically safest
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.