Best Time to Fly ATL to SAN: On-Time Stats by Hour & Airline
Hartsfield-Jackson Atlanta International → San Diego International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.3% of Atlanta (ATL) to San Diego (SAN) flights arrived on time (2,379 scheduled flights). That is 1.7 points above the national average of 77.6%.
Alaska Airlines was the most punctual of the 2 airlines on the route at 83.2%, while Delta Air Lines trailed at 78.9%.
August has been the best month (80% on time) and Thursday the weakest day of the week (71%).
0.6% of flights were cancelled, versus 1.8% nationally.
ATL to SAN 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 |
|---|---|---|---|---|
| Alaska Airlines | 83.2% | 33 min | 0.0% | 211 |
| Delta Air Lines | 78.9% | 46 min | 0.7% | 2,168 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ATL to SAN
On-time arrival % by scheduled departure hour (local time), 4,884 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 85.2% | 0.3% | 727 |
| 9am–10am | 78.2% | 0.0% | 148 |
| 10am–11am | 86.8% | 1.1% | 92 |
| 11am–12pm | 80.1% | 0.4% | 697 |
| 12pm–1pm | Limited data | 2 | |
| 1pm–2pm | 82.6% | 0.7% | 140 |
| 2pm–3pm | 81.5% | 0.0% | 411 |
| 3pm–4pm | 77.5% | 0.0% | 234 |
| 4pm–5pm | 71.7% | 0.3% | 721 |
| 5pm–6pm | 71.6% | 2.3% | 347 |
| 6pm–7pm | 70.3% | 0.6% | 346 |
| 7pm–8pm | 68.0% | 0.7% | 406 |
| 8pm–9pm | 70.5% | 0.8% | 130 |
| 9pm–10pm | 67.6% | 2.5% | 403 |
| 10pm–11pm | 68.4% | 3.8% | 80 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ATL to SAN
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) | 70.9% | -6.4 pts | 0.0% | 103 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.3% | -10.9 pts | 1.5% | 204 |
| Summer peak (Jun 15 - Aug 15) | 73.6% | -3.6 pts | 1.1% | 871 |
| All other days | 77.3% | — | 0.6% | 3,706 |
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).