About 1 in 3 DL 1791 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (35%); 0.5% were cancelled. The typical flight landed 4 minutes late.
DL 1791: ATL → SJU
Scheduled to leave Atlanta at 4:59 p.m. local time. Over the past year it arrived on time 65% of the time (198 flights), in line with other DL flights on the route at that hour (65%). Last seen in the data Aug 2, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 28 | 71% |
| Tuesday | 20 | 80% |
| Wednesday | 20 | 70% |
| Thursday | 32 | 63% |
| Friday | 32 | 53% |
| Saturday | 33 | 70% |
| Sunday | 33 | 55% |
Why it was late
All flights ATL → SJU · Connecting off DL 1791? Check the risk
Questions
How often is DL 1791 from ATL to SJU late?
Delta Air Lines 1791 from Atlanta, GA to San Juan, PR arrived 15 or more minutes late, was diverted or was cancelled on 35% of 198 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.