Best Time to Fly SFO to SUN: On-Time Stats by Hour & Airline
San Francisco International → Friedman Memorial
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 83.2% of San Francisco (SFO) to Sun Valley/Hailey/Ketchum (SUN) flights arrived on time (293 scheduled flights). That is 5.5 points above the national average of 77.6%.
SkyWest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (93% on time) and December the worst month (74%).
The cancellation rate was 0.3% (US average 1.8%).
SFO to SUN 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 |
|---|---|---|---|---|
| SkyWest Airlines | 83.2% | 77 min | 0.3% | 293 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to SUN
On-time arrival % by scheduled departure hour (local time), 547 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 7 | |
| 8am–9am | 83.7% | 0.0% | 50 |
| 9am–10am | 84.9% | 0.9% | 108 |
| 10am–11am | 87.3% | 0.0% | 71 |
| 4pm–5pm | Limited data | 16 | |
| 6pm–7pm | 85.3% | 0.7% | 269 |
| 7pm–8pm | Limited data | 14 | |
| 8pm–9pm | Limited data | 12 | |
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 SUN
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Christmas & New Year (Dec 20 - Jan 3) | 72.7% | -14.5 pts | 1.8% | 56 |
| Summer peak (Jun 15 - Aug 15) | 84.9% | -2.3 pts | 0.0% | 127 |
| All other days | 87.2% | — | 0.6% | 364 |
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).