70% of flights from San Francisco to Las Vegas arrived on time over the past 12 months. That is worse than the typical U.S. route. The 5 a.m. departures ran on time 96% of the time; the 11 a.m. ones 50%. Most reliable airline: United Airlines (76%). 12% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SFO → LAS: when a flight was late, it was under 45 minutes late 49% of the time. About 1 in 9 flights landed an hour or more late, and 1 in 82 three hours or more; 0.7% were cancelled outright.
- On time or early70%
- 15–30 min late9.4%
- 30–60 min late9.0%
- 1–2 hours late7.9%
- 2–3 hours late2.0%
- 3+ hours late1.2%
- Diverted0.1%
- Cancelled0.7%
Share of all 6,145 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| United Airlines | 2,817 | 76% | 0.4% | −4 min | 7.2% | +55 min | United Airlines |
| Southwest Airlines | 1,314 | 60% | 0.8% | +5 min | 15.8% | +64 min | Southwest Airlines |
| Alaska Airlines | 1,108 | 72% | 0.5% | −4 min | 10.7% | +63 min | Alaska Airlines 99%, Horizon Air 0%, SkyWest 0% |
| Frontier Airlines | 906 | 59% | 1.8% | +2 min | 17.0% | +87 min | Frontier Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SFO). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | United Airlines | Southwest Airlines | Alaska Airlines | Frontier Airlines |
|---|---|---|---|---|
| 5 a.m. | — | 96% | — | — |
| 7 a.m. | — | — | 92% | — |
| 8 a.m. | 88% | — | 90% | — |
| 9 a.m. | — | 57% | — | — |
| 10 a.m. | 68% | 56% | — | — |
| 11 a.m. | 76% | — | — | 32% |
| noon | 72% | — | — | — |
| 1 p.m. | 85% | 22% | 77% | — |
| 2 p.m. | 50% | 39% | — | — |
| 3 p.m. | — | 52% | — | 57% |
| 4 p.m. | 65% | — | — | — |
| 5 p.m. | 76% | — | 72% | — |
| 7 p.m. | 80% | — | — | — |
| 9 p.m. | 74% | — | — | — |
| 10 p.m. | 65% | — | — | — |
| 11 p.m. | 81% | — | — | — |
Last flight of the day
On SFO → LAS, each airline's last flight of the day was cancelled 0.9% of the time, against 0.6% for its earlier flights (1.5× as often). It arrived 3+ hours late 1.6% of the time (earlier flights: 1.1%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Alaska Airlines | 3:52 p.m. | 0.3% | 1.1% | 0.7% | first flight 7:25 a.m. |
| Frontier Airlines | 9:05 p.m. | 2.9% | 3.5% | 1.3% | first flight 11:20 a.m. |
| United Airlines | 10:59 p.m. | 0.3% | 0.5% | 0.4% | first flight 6:00 a.m. |
| Southwest Airlines | 4:08 p.m. | 0.5% | 1.6% | 0.9% | first flight 5:05 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in LAS tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: November (77%). Worst: July (67%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 968 | 66% | 1.0% |
| Tuesday | 776 | 76% | 0.4% |
| Wednesday | 760 | 74% | 0.3% |
| Thursday | 926 | 61% | 0.9% |
| Friday | 949 | 65% | 1.2% |
| Saturday | 822 | 81% | 0.2% |
| Sunday | 944 | 67% | 0.7% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 18 · air traffic/airport 13 · weather 12
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| F9 1850 | 6:00 a.m. | 206 | 64% | 1.5% | 0 min | Frontier Airlines |
| AS 718 | 7:25 a.m. | 284 | 86% | 1.8% | −11 min | Alaska Airlines |
| UA 2492 | 8:25 a.m. | 188 | 91% | 0.0% | −7 min | United Airlines |
| UA 2382 | 8:42 a.m. | 135 | 75% | 0.0% | −1 min | United Airlines |
| UA 611 | 11:00 a.m. | 312 | 76% | 0.6% | +1 min | United Airlines |
| F9 4158 | 11:20 a.m. | 279 | 60% | 1.1% | −1 min | Frontier Airlines |
| AS 776 | 11:27 a.m. | 315 | 59% | 0.3% | +7 min | Alaska Airlines |
| UA 751 | 4:55 p.m. | 356 | 68% | 0.6% | +1 min | United Airlines |
| UA 1995 | 7:10 p.m. | 357 | 79% | 0.0% | −9 min | United Airlines |
| F9 4156 | 9:00 p.m. | 214 | 49% | 4.2% | +14 min | Frontier Airlines |
| UA 406 | 9:15 p.m. | 340 | 76% | 0.6% | −5 min | United Airlines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jul 16, 2026 | 19 | 21% | 1 |
| Jun 19, 2026 | 18 | 22% | 1 |
| Jan 1, 2026 | 17 | 24% | 0 |
| May 3, 2026 | 19 | 26% | 0 |
| May 28, 2026 | 19 | 26% | 1 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of San Francisco or Las Vegas. SJC → LAS has been 10 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SFO → LAS (this route) | 6,145 | 70% | 0.7% |
| SJC → LAS San Jose to Las Vegas Harry Reid | 3,663 | 80% | 0.5% |
| OAK → LAS Oakland to Las Vegas Harry Reid | 3,264 | 76% | 0.6% |
Questions
How often are flights from SFO to LAS on time?
70% of 6,145 scheduled flights from San Francisco, CA to Las Vegas, NV arrived within 15 minutes of schedule between September 2025 and August 2026. 0.7% were cancelled.
What is the best time of day to fly SFO to LAS?
Flights scheduled to leave at 5 a.m. were the most reliable (96% on time). The 11 a.m. departures were the least (50%).
Which airline is most on time from SFO to LAS?
United Airlines: 76% of its 2,817 flights on the route arrived on time. Southwest Airlines: 60%. Alaska Airlines: 72%. Frontier Airlines: 59%.
What month has the most delays from SFO to LAS?
July (67% on time). The best month is November (77%), over 2023–2026.
Is the last flight of the day from SFO to LAS more likely to be cancelled?
Yes. Each airline's last SFO–LAS flight of the day was cancelled 0.9% of the time over the past year, against 0.6% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- LAS → SFO (return)
- San Francisco (SFO) delays by hour
- Flights into Las Vegas Harry Reid (LAS)
- United Airlines on-time record
- Southwest Airlines on-time record
- Alaska Airlines on-time record
- Frontier Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.