DL831
DL831 (Delta Air Lines) is a multi-stop service on 3 routes, busiest Seattle to Austin. Of 888 departures recorded from October 2024 to July 2026, 78.4% left on time, according to the US BTS.
- On-time departures78.4%of 888 flights
- Average delay13.5 min
- July 202662▲ 77.1%vs July 2025
- Cancelled1.4%
- Legs flown under this number3
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 | 31 | 58 | ▲ 87.1% |
| February | 28 | 56 | ▲ 100.0% |
| March | 50 | 56 | ▲ 12.0% |
| April | 37 | 51 | ▲ 37.8% |
| May | 25 | 60 | ▲ 140.0% |
| June | 32 | 60 | ▲ 87.5% |
| July | 35 | 62 | ▲ 77.1% |
| August | 35 | – | – |
| September | 31 | – | – |
| October | 31 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 238 | 403 | ▲ 69.3% |
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 | 77.4% | 83.3% | ▲ 7.6% |
| February | 82.1% | 83.9% | ▲ 2.2% |
| March | 78.0% | 72.2% | ▼ 7.4% |
| April | 83.8% | 86.3% | ▲ 3.0% |
| May | 84.0% | 71.7% | ▼ 14.7% |
| June | 81.3% | 72.4% | ▼ 10.9% |
| July | 88.6% | 62.9% | ▼ 29.0% |
| August | 82.9% | – | – |
| September | 80.0% | – | – |
| October | 87.1% | – | in progress |
| November | 77.8% | – | – |
| December | 69.0% | – | – |
| Year-to-date average (Jan–Jul) | 82.2% | 76.1% | ▼ 7.4% |
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 | 4 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 2 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 8 |
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 98.6% 876
- Cancelled 1.4% 12
Share of all recorded flights in the period, all legs. · Oct 13, 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 |
|---|---|---|---|---|
| SEA AUS Seattle–Tacoma International Airport – Austin Bergstrom International Airport | 2,848 | 10.0 min | 83.4% | 550 |
| AUS SEA Austin Bergstrom International Airport – Seattle–Tacoma International Airport | 2,848 | 22.1 min | 68.3% | 276 |
| MCO BOS Orlando International Airport – Boston Logan International Airport | 1,806 | 6.2 min | 79.0% | 62 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 75.0% | 0 |
| November 2024 | 36 | 34 | 79.4% | 2 |
| December 2024 | 45 | 45 | 80.0% | 0 |
| January 2025 | 31 | 31 | 77.4% | 0 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 50 | 50 | 78.0% | 0 |
| April 2025 | 37 | 37 | 83.8% | 0 |
| May 2025 | 25 | 25 | 84.0% | 0 |
| June 2025 | 32 | 32 | 81.3% | 0 |
| July 2025 | 35 | 35 | 88.6% | 0 |
| August 2025 | 35 | 35 | 82.9% | 0 |
| September 2025 | 31 | 30 | 80.0% | 1 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 28 | 27 | 77.8% | 1 |
| December 2025 | 29 | 29 | 69.0% | 0 |
| January 2026 | 58 | 54 | 83.3% | 4 |
| February 2026 | 56 | 56 | 83.9% | 0 |
| March 2026 | 56 | 54 | 72.2% | 2 |
| April 2026 | 51 | 51 | 86.3% | 0 |
| May 2026 | 60 | 60 | 71.7% | 0 |
| June 2026 | 60 | 58 | 72.4% | 2 |
| July 2026 | 62 | 62 | 62.9% | 0 |