DL635
DL635 (Delta Air Lines) is a multi-stop service on 6 routes, busiest San Francisco to Atlanta. Of 510 departures recorded from October 2024 to July 2026, 77.6% left on time, according to the US BTS.
- On-time departures77.6%of 510 flights
- Average delay10.1 min
- July 202626▲ 36.8%vs July 2025
- Cancelled0.4%
- Legs flown under this number6
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 31 | ▲ 933.3% |
| February | 4 | 28 | ▲ 600.0% |
| March | 16 | 21 | ▲ 31.3% |
| April | 16 | 17 | ▲ 6.3% |
| May | 22 | 27 | ▲ 22.7% |
| June | 28 | 20 | ▼ 28.6% |
| July | 19 | 26 | ▲ 36.8% |
| August | 32 | – | – |
| September | 35 | – | – |
| October | 31 | – | in progress |
| November | 26 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 108 | 170 | ▲ 57.4% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 86.7% | ▼ 13.3% |
| February | 75.0% | 85.7% | ▲ 14.3% |
| March | 81.3% | 95.2% | ▲ 17.2% |
| April | 68.8% | 82.4% | ▲ 19.8% |
| May | 68.2% | 59.3% | ▼ 13.1% |
| June | 85.7% | 85.0% | ▼ 0.8% |
| July | 63.2% | 65.4% | ▲ 3.5% |
| August | 62.5% | – | – |
| September | 88.6% | – | – |
| October | 71.0% | – | in progress |
| November | 80.0% | – | – |
| December | 67.7% | – | – |
| Year-to-date average (Jan–Jul) | 77.4% | 79.9% | ▲ 3.2% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.6% 508
- Cancelled 0.4% 2
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SFO ATL San Francisco International Airport – Hartsfield Jackson Atlanta International Airport | 3,435 | 10.1 min | 78.4% | 348 |
| ATL SFO Hartsfield Jackson Atlanta International Airport – San Francisco International Airport | 3,435 | 9.6 min | 77.0% | 101 |
| BOI ATL Boise Air Terminal/Gowen Field – Hartsfield Jackson Atlanta International Airport | 2,953 | 14.4 min | 70.0% | 40 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 89.5% | 0 |
| November 2024 | 28 | 28 | 82.1% | 0 |
| December 2024 | 30 | 30 | 83.3% | 0 |
| January 2025 | 3 | 3 | 100.0% | 0 |
| February 2025 | 4 | 4 | 75.0% | 0 |
| March 2025 | 16 | 16 | 81.3% | 0 |
| April 2025 | 16 | 16 | 68.8% | 0 |
| May 2025 | 22 | 22 | 68.2% | 0 |
| June 2025 | 28 | 28 | 85.7% | 0 |
| July 2025 | 19 | 19 | 63.2% | 0 |
| August 2025 | 32 | 32 | 62.5% | 0 |
| September 2025 | 35 | 35 | 88.6% | 0 |
| October 2025 | 31 | 31 | 71.0% | 0 |
| November 2025 | 26 | 25 | 80.0% | 1 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 31 | 30 | 86.7% | 1 |
| February 2026 | 28 | 28 | 85.7% | 0 |
| March 2026 | 21 | 21 | 95.2% | 0 |
| April 2026 | 17 | 17 | 82.4% | 0 |
| May 2026 | 27 | 27 | 59.3% | 0 |
| June 2026 | 20 | 20 | 85.0% | 0 |
| July 2026 | 26 | 26 | 65.4% | 0 |