Atlanta (ATL) to San Juan (SJU): On-Time Performance
Data through July 2026
Atlanta (ATL) to San Juan (SJU) effectively runs on two schedules. In September 2024, 88% of arrivals were on time; in March 2026 that fell to 61% — a 27-point seasonal swing. Across the full period the route averages 72% on-time against a national 78%. Morning departures also hold up better than evening ones (75% vs 63%), which matters most in the rough months.
- On-time
- 72%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.0%
- Flights/day
- 5.8
- last 12 months
- Duration
- 3h 32m
- scheduled
- Distance
- 1,547 mi
Best airline from ATL to SJU
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 76% | 14 min | 0.8% | 3,458 |
| Spirit Airlines | 65% | 24 min | 1.9% | 368 |
| Frontier Airlines | 55% | 38 min | 2.0% | 601 |
Monthly on-time trend
Best time to fly from ATL to SJU
Aim for departures around 8 a.m. (87% on-time); avoid 8 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 69% | 21 min |
| Tuesday | 78% | 13 min |
| Wednesdaybest | 81% | 13 min |
| Thursday | 74% | 15 min |
| Friday | 73% | 20 min |
| Saturday | 66% | 21 min |
| Sunday | 66% | 26 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft23%
- Airline operations50%
- National airspace system22%
- Weather4%
Frequently asked questions
- How often are flights from ATL to SJU delayed?
- 28% of ATL–SJU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from ATL to SJU?
- Delta Air Lines has the best on-time record on this route at 76%, based on 3,458 flights. 3 airlines flew ATL–SJU frequently enough to compare in this period.
- What is the best time of day to fly from ATL to SJU?
- Departures around 8 a.m. have the best record (87% on-time), while departures around 8 p.m. have the worst (51%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ATL to SJU?
- The scheduled ATL–SJU flight time averages 3h 32m over 1,547 miles. Actual arrival times vary — flights on this route land 15+ minutes late 28% of the time.
- How often are ATL to SJU flights cancelled?
- 1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ATL to SJU?
- March 2026 was the roughest month in this dataset, with only 61% of arrivals on time. The best was September 2024 at 88%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 4,427 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.