ATL to SJU flight delays & on-time performance
Nonstop flights from Hartsfield Jackson Atlanta International Airport to Luis Munoz Marin International Airport · 1,547 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ATL or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Atlanta (ATL) to San Juan (SJU) arrived on time 71% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.3% were cancelled, and 9% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (76% on time); Frontier Airlines was the least (55%).
- Departures scheduled around 8am did best (88% on time); around 4pm did worst (57%).
- Wednesday was the most reliable day to fly (82% on time) and Sunday the least (63%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (47%).
Which airline is most on time from ATL to SJU?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 76% | 0.9% | 14 min | 6.1% | 1,627 |
| Frontier Airlines | 55% | 1.8% | 33 min | 16.3% | 379 |
| Spirit Airlines | 36% | 6.5% | 39 min | 20.7% | 93 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am77%45 flights
- 8am88%318 flights
- 9am78%256 flights
- 10am61%415 flights
- 12pm77%106 flights
- 1pm81%284 flights
- 4pm57%236 flights
- 6pm67%245 flights
- 7pm60%120 flights
- 8pm43%22 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday68%1.0% cancelled
- Tuesday75%0.8% cancelled
- Wednesday82%0.0% cancelled
- Thursday73%0.0% cancelled
- Friday74%0.3% cancelled
- Saturday63%4.4% cancelled
- Sunday63%2.2% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)47%
- Late-arriving aircraft29%
- Air traffic control & airport congestion22%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)46%
- Extreme weather29%
- Security21%
- Air traffic control & airport congestion4%
ATL to SJU: common questions
- How often are ATL to SJU flights on time?
- 71% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Atlanta to San Juan cancelled?
- 1.3% of scheduled flights were cancelled (28 of 2,099).
- How long are typical delays?
- Across all flights the average arrival delay was 18 min (early arrivals count as zero). Flights that were late arrived 58 min behind schedule on average, and 8.5% of flights were an hour or more late.
- How long is taxi time at ATL?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to ATL — 81% on time
More flights from Atlanta
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ATL → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.