Best Time to Fly LAS to SFO: On-Time Stats by Hour & Airline
Harry Reid International → San Francisco International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 60.6% of Las Vegas (LAS) to San Francisco (SFO) flights arrived on time (6,115 scheduled flights). That is 17.0 points below the national average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 65.1%, while Southwest Airlines trailed at 46.2%.
January has been the best month (80% on time) and Thursday the weakest day of the week (60%).
0.7% of flights were cancelled, versus 1.8% nationally.
LAS to SFO 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 | 65.1% | 62 min | 0.4% | 2,793 |
| Alaska Airlines | 64.8% | 51 min | 0.8% | 1,114 |
| Frontier Airlines | 62.4% | 70 min | 1.7% | 893 |
| Southwest Airlines | 46.2% | 54 min | 0.6% | 1,312 |
| SkyWest Airlines | Limited data | 3 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAS to SFO
On-time arrival % by scheduled departure hour (local time), 12,322 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.8% | 0.9% | 116 |
| 6am–7am | 93.8% | 0.3% | 1,182 |
| 7am–8am | 61.8% | 0.9% | 1,002 |
| 8am–9am | 57.7% | 0.6% | 792 |
| 9am–10am | 68.2% | 0.3% | 577 |
| 10am–11am | 66.6% | 0.8% | 780 |
| 11am–12pm | 75.8% | 0.3% | 904 |
| 12pm–1pm | 67.8% | 0.2% | 451 |
| 1pm–2pm | 70.6% | 0.6% | 866 |
| 2pm–3pm | 59.7% | 0.5% | 382 |
| 3pm–4pm | 68.7% | 0.5% | 1,043 |
| 4pm–5pm | 75.2% | 0.2% | 525 |
| 5pm–6pm | 69.2% | 0.4% | 477 |
| 6pm–7pm | 57.0% | 0.4% | 762 |
| 7pm–8pm | 49.4% | 0.8% | 1,104 |
| 8pm–9pm | 63.2% | 0.4% | 459 |
| 9pm–10pm | 54.1% | 0.7% | 450 |
| 10pm–11pm | 55.8% | 1.6% | 432 |
| 11pm–12am | Limited data | 18 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAS to SFO
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) | 72.1% | +2.7 pts | 0.0% | 240 |
| Christmas & New Year (Dec 20 - Jan 3) | 54.3% | -15.1 pts | 1.0% | 517 |
| Summer peak (Jun 15 - Aug 15) | 58.0% | -11.4 pts | 1.0% | 2,041 |
| All other days | 69.4% | — | 0.5% | 9,524 |
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).