Las Vegas (LAS) to San Francisco (SFO): On-Time Performance
Data through May 2026
The calendar drives reliability on LAS–SFO. March 2026 flights landed on schedule 83% of the time, but May 2026 dropped to 40% — a gap of 43 points. Across the full period the route averages 69% on-time against a national 78%. Morning departures also hold up better than evening ones (75% vs 59%), which matters most in the rough months.
- On-time
- 69%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 17
- last 12 months
- Duration
- 1h 42m
- scheduled
- Distance
- 414 mi
Best airline from LAS to SFO
5 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 74% | 17 min | 0.5% | 5,076 |
| Alaska Airlines | 69% | 18 min | 1.1% | 2,203 |
| Frontier Airlines | 68% | 22 min | 1.2% | 1,989 |
| SkyWest Airlines | 64% | 28 min | 0.8% | 249 |
| Southwest Airlines | 61% | 23 min | 0.3% | 2,627 |
Monthly on-time trend
Best time to fly from LAS to SFO
Aim for departures around 5 a.m. (94% on-time); avoid 7 p.m. departures (52%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 68% | 22 min |
| Tuesday | 77% | 13 min |
| Wednesday | 73% | 17 min |
| Thursday | 63% | 24 min |
| Friday | 65% | 22 min |
| Saturdaybest | 77% | 12 min |
| Sunday | 64% | 23 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft32%
- Airline operations20%
- National airspace system46%
- Weather2%
Frequently asked questions
- How often are flights from LAS to SFO delayed?
- 31% of LAS–SFO flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 19 minutes.
- Which airline is most reliable from LAS to SFO?
- United Airlines has the best on-time record on this route at 74%, based on 5,076 flights. 5 airlines flew LAS–SFO frequently enough to compare in this period.
- What is the best time of day to fly from LAS to SFO?
- Departures around 5 a.m. have the best record (94% on-time), while departures around 7 p.m. have the worst (52%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to SFO?
- The scheduled LAS–SFO flight time averages 1h 42m over 414 miles. Actual arrival times vary — flights on this route land 15+ minutes late 31% of the time.
- How often are LAS to SFO flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from LAS to SFO?
- May 2026 was the roughest month in this dataset, with only 40% of arrivals on time. The best was March 2026 at 83%. If your dates are flexible, that 43-point gap is worth planning around.
Explore related pages
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Based on 12,144 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.