Best Time to Fly SLC to SFO: On-Time Stats by Hour & Airline
Salt Lake City International → San Francisco International
Data through July 2026 · Last updated October 18, 2026
3,454 flights were scheduled from Salt Lake City (SLC) to San Francisco (SFO) in the last 12 months, and 65.8% of those that flew arrived on time, 11.8 points below the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 70.8%, while Delta Air Lines trailed at 64.0%.
January has been the best month (83% on time) and Monday the weakest day of the week (68%).
1.0% of flights were cancelled, versus 1.8% nationally.
SLC 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 | 70.8% | 71 min | 0.2% | 507 |
| Frontier Airlines | 66.8% | 99 min | 2.6% | 195 |
| SkyWest Airlines | 66.3% | 76 min | 1.1% | 1,045 |
| Delta Air Lines | 64.0% | 53 min | 1.0% | 1,707 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SLC to SFO
On-time arrival % by scheduled departure hour (local time), 7,065 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 1 | |
| 6am–7am | 93.0% | 0.0% | 461 |
| 7am–8am | 70.2% | 1.4% | 504 |
| 8am–9am | 72.0% | 0.0% | 624 |
| 9am–10am | 56.6% | 0.3% | 390 |
| 10am–11am | 73.1% | 0.0% | 79 |
| 11am–12pm | 67.5% | 0.1% | 758 |
| 12pm–1pm | 82.4% | 0.3% | 330 |
| 1pm–2pm | 86.2% | 0.4% | 247 |
| 2pm–3pm | 80.0% | 0.8% | 121 |
| 3pm–4pm | 72.7% | 0.6% | 814 |
| 4pm–5pm | 74.8% | 1.7% | 721 |
| 5pm–6pm | 77.3% | 2.8% | 285 |
| 6pm–7pm | 82.3% | 0.0% | 175 |
| 7pm–8pm | 78.8% | 0.0% | 33 |
| 8pm–9pm | 54.2% | 1.0% | 794 |
| 9pm–10pm | 75.3% | 0.0% | 158 |
| 10pm–11pm | 72.8% | 0.4% | 465 |
| 11pm–12am | 82.9% | 0.0% | 105 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SLC 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) | 79.5% | +4.7 pts | 0.0% | 127 |
| Christmas & New Year (Dec 20 - Jan 3) | 59.7% | -15.1 pts | 1.9% | 311 |
| Summer peak (Jun 15 - Aug 15) | 63.1% | -11.7 pts | 0.9% | 1,222 |
| All other days | 74.8% | — | 0.6% | 5,405 |
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).