Best Time to Fly CMH to SFO: On-Time Stats by Hour & Airline
John Glenn Columbus International → San Francisco International
Data through July 2026 · Last updated October 18, 2026
322 flights were scheduled from Columbus (CMH) to San Francisco (SFO) in the last 12 months, and 64.1% of those that flew arrived on time, 13.6 points below the US average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
September has been the best month (73% on time) and Thursday the weakest day of the week (52%).
0.6% of flights were cancelled, versus 1.8% nationally.
CMH 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 | 64.1% | 82 min | 0.6% | 322 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly CMH to SFO
On-time arrival % by scheduled departure hour (local time), 570 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 65.1% | 0.7% | 297 |
| 9am–10am | Limited data | 6 | |
| 5pm–6pm | 72.7% | 0.0% | 66 |
| 7pm–8pm | 48.7% | 0.0% | 198 |
| 9pm–10pm | Limited data | 3 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on CMH 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) | Limited data | 17 | ||
| Summer peak (Jun 15 - Aug 15) | 53.3% | -10.4 pts | 0.7% | 151 |
| All other days | 63.8% | — | 0.2% | 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).