Best Time to Fly SFO to SLC: On-Time Stats by Hour & Airline
San Francisco International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
3,453 flights were scheduled from San Francisco (SFO) to Salt Lake City (SLC) in the last 12 months, and 76.7% of those that flew arrived on time, 1.0 points below the US average of 77.6%.
Among 4 airlines, Delta Air Lines led with 77.4% on time and Frontier Airlines was last with 70.2%.
Over 24 months, Tuesday was the most reliable day (84% on time) and June the worst month (69%).
The cancellation rate was 1.0% (US average 1.8%).
SFO to SLC 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 |
|---|---|---|---|---|
| Delta Air Lines | 77.4% | 75 min | 1.0% | 1,709 |
| SkyWest Airlines | 76.8% | 68 min | 1.2% | 1,044 |
| United Airlines | 76.3% | 55 min | 0.2% | 505 |
| Frontier Airlines | 70.2% | 80 min | 2.0% | 195 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to SLC
On-time arrival % by scheduled departure hour (local time), 7,061 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.3% | 0.2% | 489 |
| 6am–7am | 95.4% | 0.8% | 241 |
| 7am–8am | Limited data | 6 | |
| 8am–9am | 86.3% | 0.2% | 476 |
| 9am–10am | 81.0% | 0.8% | 794 |
| 10am–11am | 78.2% | 0.0% | 427 |
| 11am–12pm | 70.2% | 6.0% | 50 |
| 12pm–1pm | 78.0% | 0.8% | 357 |
| 1pm–2pm | 71.0% | 0.2% | 1,028 |
| 2pm–3pm | 70.8% | 0.6% | 179 |
| 3pm–4pm | 81.1% | 0.0% | 53 |
| 4pm–5pm | 68.2% | 1.1% | 710 |
| 5pm–6pm | 75.9% | 1.1% | 861 |
| 6pm–7pm | 81.5% | 0.4% | 499 |
| 7pm–8pm | 81.9% | 0.7% | 719 |
| 8pm–9pm | 70.0% | 0.6% | 171 |
| 9pm–10pm | Limited data | 1 | |
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 SLC
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) | 86.6% | +5.9 pts | 0.0% | 127 |
| Christmas & New Year (Dec 20 - Jan 3) | 61.8% | -18.9 pts | 2.2% | 311 |
| Summer peak (Jun 15 - Aug 15) | 73.6% | -7.2 pts | 1.0% | 1,221 |
| All other days | 80.7% | — | 0.5% | 5,402 |
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).