About 1 in 9 DL 809 flights from Atlanta arrived 15+ minutes late, diverted or cancelled over the past year (11%); 1.1% were cancelled. The typical flight landed 8 minutes early.
DL 809: ATL → SJC
Scheduled to leave Atlanta at 9:40 a.m. local time. Over the past year it arrived on time 89% of the time (365 flights), in line with other DL flights on the route at that hour (91%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 87% |
| Tuesday | 52 | 88% |
| Wednesday | 52 | 92% |
| Thursday | 52 | 88% |
| Friday | 52 | 92% |
| Saturday | 52 | 83% |
| Sunday | 52 | 90% |
Why it was late
All flights ATL → SJC · Connecting off DL 809? Check the risk
DL 809: SJC → ATL
Scheduled to leave San Jose at 12:40 p.m. local time. Over the past year it arrived on time 90% of the time (364 flights), in line with other DL flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 53 | 92% |
| Tuesday | 52 | 92% |
| Wednesday | 52 | 94% |
| Thursday | 51 | 94% |
| Friday | 52 | 83% |
| Saturday | 52 | 87% |
| Sunday | 52 | 87% |
Why it was late
All flights SJC → ATL · Connecting off DL 809? Check the risk
Questions
How often is DL 809 from ATL to SJC late?
Delta Air Lines 809 from Atlanta, GA to San Jose, CA arrived 15 or more minutes late, was diverted or was cancelled on 11% of 365 scheduled flights between September 2025 and August 2026. 1.1% were cancelled.
How often is DL 809 from SJC to ATL late?
Delta Air Lines 809 from San Jose, CA to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 10% of 364 scheduled flights between September 2025 and August 2026. 0.8% 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.