San Juan (SJU) to Atlanta (ATL): On-Time Performance
Data through July 2026
The calendar drives reliability on SJU–ATL. October 2024 flights landed on schedule 90% of the time, but July 2024 dropped to 65% — a gap of 25 points. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 78%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 5.7
- last 12 months
- Duration
- 4h 0m
- scheduled
- Distance
- 1,547 mi
Best airline from SJU to ATL
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 88% | 9 min | 0.8% | 3,458 |
| Spirit Airlines | 65% | 23 min | 2.2% | 366 |
| Frontier Airlines | 56% | 38 min | 2.5% | 596 |
Monthly on-time trend
Best time to fly from SJU to ATL
Aim for departures around 7 a.m. (92% on-time); avoid 3 p.m. departures (66%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 14 min |
| Tuesday | 85% | 11 min |
| Wednesdaybest | 86% | 9 min |
| Thursday | 83% | 14 min |
| Friday | 83% | 15 min |
| Saturday | 80% | 17 min |
| Sunday | 76% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations34%
- National airspace system21%
- Weather2%
Frequently asked questions
- How often are flights from SJU to ATL delayed?
- 19% of SJU–ATL 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 14 minutes.
- Which airline is most reliable from SJU to ATL?
- Delta Air Lines has the best on-time record on this route at 88%, based on 3,458 flights. 3 airlines flew SJU–ATL frequently enough to compare in this period.
- What is the best time of day to fly from SJU to ATL?
- Departures around 7 a.m. have the best record (92% on-time), while departures around 3 p.m. have the worst (66%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SJU to ATL?
- The scheduled SJU–ATL flight time averages 4h 0m over 1,547 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are SJU to ATL flights cancelled?
- 1.2% 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 SJU to ATL?
- July 2024 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 25-point gap is worth planning around.
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Based on 4,420 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.