Best Time to Fly SAN to SLC: On-Time Stats by Hour & Airline
San Diego International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
3,011 flights were scheduled from San Diego (SAN) to Salt Lake City (SLC) in the last 12 months, and 84.4% of those that flew arrived on time, 6.8 points above the US average of 77.6%.
Delta Air Lines was the most punctual of the 4 airlines on the route at 89.0%, while Southwest Airlines trailed at 75.6%.
April has been the best month (88% on time) and Friday the weakest day of the week (77%).
0.7% of flights were cancelled, versus 1.8% nationally.
SAN 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 | 89.0% | 76 min | 0.8% | 1,733 |
| Frontier Airlines | 83.3% | 91 min | 0.8% | 121 |
| SkyWest Airlines | 78.6% | 62 min | 0.7% | 749 |
| Southwest Airlines | 75.6% | 45 min | 0.2% | 408 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SAN to SLC
On-time arrival % by scheduled departure hour (local time), 5,605 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 95.2% | 0.5% | 772 |
| 7am–8am | Limited data | 18 | |
| 8am–9am | 81.7% | 0.5% | 449 |
| 9am–10am | 90.7% | 0.7% | 607 |
| 10am–11am | 82.0% | 0.2% | 431 |
| 11am–12pm | 69.0% | 0.0% | 129 |
| 12pm–1pm | 82.1% | 0.0% | 162 |
| 1pm–2pm | 82.6% | 0.7% | 863 |
| 2pm–3pm | 85.7% | 0.0% | 35 |
| 3pm–4pm | 68.9% | 2.2% | 135 |
| 4pm–5pm | 70.2% | 0.0% | 161 |
| 5pm–6pm | 79.6% | 0.4% | 1,016 |
| 6pm–7pm | 72.5% | 0.0% | 109 |
| 7pm–8pm | 84.6% | 0.2% | 633 |
| 8pm–9pm | 72.6% | 1.2% | 85 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SAN 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) | 81.5% | -3.9 pts | 0.0% | 108 |
| Christmas & New Year (Dec 20 - Jan 3) | 71.6% | -13.8 pts | 1.1% | 267 |
| Summer peak (Jun 15 - Aug 15) | 78.8% | -6.6 pts | 0.6% | 977 |
| All other days | 85.4% | — | 0.4% | 4,253 |
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).