Carrier route record
F9SFO→LAS
Frontier Airlines · San Francisco to Las Vegas
- Flights
- 879
- 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 SFO to LAS draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 879 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,757 at 79.6% on time.
United Airlines is the most reliable of the three carriers covered here at 79.6% on time across 2,757 flights.
Key figures
On time
65.6%
Arrivals under 15 minutes late, of 868 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
1.25%
National rate is 1.81%
Whole route
74.1%
Every carrier on SFO to LAS, 6,066 flights
These figures cover 879 flights between July 2025 and June 2026. Beyond the headline rate, 15.9% 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 SFO to LAS
Frontier flew 879 of the 6,066 flights on SFO to LAS, about 14% of it. Its 65.6% on time is 9 points worse than the route as a whole, which runs 74.1%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from United at 79.6% to SkyWest at 50.0%. 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 79.6% of the time; Southwest Airlines manages 66.3%. Sample sizes sit next to every figure, because a two-point gap across 1,312 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 2,757 | 79.6% | 55 min | 0.36% | B+ |
| Alaska Airlines | 1,116 | 76.5% | 66 min | 0.81% | B+ |
| Southwest Airlines | 1,312 | 66.3% | 64 min | 0.53% | C+ |
| Frontier Airlines (this page) | 879 | 65.6% | 96 min | 1.25% | C |
| SkyWest Airlinesthin sample | 2 | 50.0% | 81 min | 0.00% | F+ |
The spread between United and Southwest is 13 points, wide enough that it should decide the booking. On a hundred trips that is 13 more arrivals inside the on-time window.
Flight by flight
Frontier flight numbers on SFO to LAS
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 47 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am154 flights90.1%
- 8am–11am105 flights74.3%
- 11am–2pm128 flights43.3%
- 2pm–5pm163 flights69.6%
- 5pm–8pm107 flights72.0%
- 8pm–5am222 flights51.2%
Scale runs 35% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 43.3% on time against 90.1% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 222 flights scheduled in it.
Across the year
Frontier on SFO to LAS through the year
June is the worst month at 46.3% on time, 35 points below January, the best at 80.8%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 87 flights.
Across the week, Wednesday is the strongest day at 80.5% on time and Thursday the weakest at 59.2%. 21 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 61% of the 29,000 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.
- 61%Late-arriving aircraft
- 27%Carrier
- 11%National Airspace System
- 1%Extreme weather
61% 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 29,000 reported delay minutes here, that single category outweighs weather by 61 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 28,547 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 90.1% on time here.
Cancellations sit at 1.25% 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. 15.9% 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 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 64.3% on time across 875 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. 879 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 SFO to LAS
Put together: treat all of this as provisional. 879 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 65.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 868 completed flights over 12 months sit behind that.
Related
Where to go next
- SFO to LAS, every carrier
- Frontier on LAS to SFO, the return leg
- United Airlines on SFO to LAS79.6%
- Alaska Airlines on SFO to LAS76.5%
- Southwest Airlines on SFO to LAS66.3%
- Frontier Airlines network-wide record
- San Francisco International (SFO) delay statistics
- Harry Reid International (LAS) 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.