Best Time to Fly SFO to LAS: On-Time Stats by Hour & Airline
San Francisco International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
6,118 flights were scheduled from San Francisco (SFO) to Las Vegas (LAS) in the last 12 months, and 72.7% of those that flew arrived on time, 5.0 points below the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 78.6%, while Frontier Airlines trailed at 63.8%.
January has been the best month (80% on time) and Thursday the weakest day of the week (67%).
0.7% of flights were cancelled, versus 1.8% nationally.
SFO to LAS on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 78.6% | 54 min | 0.4% | 2,793 |
| Alaska Airlines | 75.2% | 65 min | 0.5% | 1,114 |
| Southwest Airlines | 64.0% | 62 min | 0.7% | 1,314 |
| Frontier Airlines | 63.8% | 88 min | 1.7% | 895 |
| SkyWest Airlines | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to LAS
On-time arrival % by scheduled departure hour (local time), 12,330 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.2% | 0.5% | 657 |
| 6am–7am | 95.3% | 0.9% | 455 |
| 7am–8am | 93.6% | 0.6% | 550 |
| 8am–9am | 90.4% | 0.8% | 1,091 |
| 9am–10am | 72.8% | 1.1% | 364 |
| 10am–11am | 66.2% | 0.6% | 901 |
| 11am–12pm | 66.3% | 1.1% | 637 |
| 12pm–1pm | 72.5% | 0.2% | 559 |
| 1pm–2pm | 69.5% | 0.2% | 939 |
| 2pm–3pm | 62.0% | 0.2% | 432 |
| 3pm–4pm | 62.5% | 0.2% | 635 |
| 4pm–5pm | 65.7% | 0.6% | 950 |
| 5pm–6pm | 74.7% | 0.3% | 647 |
| 6pm–7pm | 70.4% | 0.9% | 542 |
| 7pm–8pm | 77.7% | 0.4% | 826 |
| 8pm–9pm | 69.5% | 1.3% | 469 |
| 9pm–10pm | 68.8% | 0.7% | 585 |
| 10pm–11pm | 66.9% | 1.4% | 646 |
| 11pm–12am | 82.7% | 0.0% | 445 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SFO to LAS
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 77.9% | +1.6 pts | 0.4% | 241 |
| Christmas & New Year (Dec 20 - Jan 3) | 64.8% | -11.6 pts | 0.6% | 518 |
| Summer peak (Jun 15 - Aug 15) | 70.2% | -6.1 pts | 1.2% | 2,050 |
| All other days | 76.3% | — | 0.5% | 9,521 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).