Best Time to Fly SJU to ATL: On-Time Stats by Hour & Airline
Luis Munoz Marin International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
2,095 flights were scheduled from San Juan (SJU) to Atlanta (ATL) in the last 12 months, and 81.4% of those that flew arrived on time, 3.8 points above the US average of 77.6%.
Among 3 airlines, Delta Air Lines led with 91.0% on time and Spirit Airlines was last with 21.8%.
Over 24 months, Wednesday was the most reliable day (87% on time) and January the worst month (78%).
The cancellation rate was 1.4% (US average 1.8%).
SJU to ATL 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 | 91.0% | 78 min | 0.9% | 1,627 |
| Frontier Airlines | 53.6% | 89 min | 2.1% | 375 |
| Spirit Airlines | 21.8% | 64 min | 6.5% | 93 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SJU to ATL
On-time arrival % by scheduled departure hour (local time), 4,216 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 1am–2am | Limited data | 15 | |
| 2am–3am | 87.9% | 5.7% | 35 |
| 3am–4am | Limited data | 8 | |
| 4am–5am | Limited data | 11 | |
| 5am–6am | Limited data | 6 | |
| 6am–7am | 89.3% | 1.5% | 465 |
| 7am–8am | 92.0% | 1.0% | 682 |
| 8am–9am | 89.0% | 0.0% | 91 |
| 9am–10am | Limited data | 7 | |
| 10am–11am | 78.7% | 0.0% | 47 |
| 11am–12pm | 73.8% | 0.0% | 43 |
| 12pm–1pm | 79.8% | 0.8% | 393 |
| 1pm–2pm | 86.8% | 0.7% | 295 |
| 2pm–3pm | 85.1% | 0.7% | 613 |
| 3pm–4pm | 67.2% | 1.6% | 430 |
| 4pm–5pm | 72.1% | 2.5% | 197 |
| 5pm–6pm | 79.5% | 0.8% | 588 |
| 6pm–7pm | 84.1% | 1.9% | 264 |
| 7pm–8pm | Limited data | 7 | |
| 8pm–9pm | Limited data | 4 | |
| 9pm–10pm | Limited data | 9 | |
| 10pm–11pm | Limited data | 6 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SJU to ATL
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) | 78.9% | -4.4 pts | 1.4% | 72 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.8% | -3.4 pts | 5.8% | 242 |
| Summer peak (Jun 15 - Aug 15) | 82.5% | -0.8 pts | 1.2% | 753 |
| All other days | 83.2% | — | 0.8% | 3,149 |
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).