DL1239
DL1239 (Delta Air Lines) flies Seattle to Salt Lake City. Of 463 departures recorded from October 2024 to July 2026, 81.4% left on time, according to the US BTS.
- On-time departures81.4%of 463 flights
- Average delay7.8 min
- July 202624▲ 50.0%vs July 2025
- Cancelled0.2%
according to the US BTS · Oct 13, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 27 | 31 | ▲ 14.8% |
| February | 22 | 24 | ▲ 9.1% |
| March | 26 | 27 | ▲ 3.8% |
| April | 26 | 26 | 0.0% |
| May | 18 | 26 | ▲ 44.4% |
| June | 18 | 19 | ▲ 5.6% |
| July | 16 | 24 | ▲ 50.0% |
| August | 14 | – | – |
| September | 12 | – | – |
| October | 15 | – | in progress |
| November | 14 | – | – |
| December | 21 | – | – |
| Year to date (Jan–Jul) | 153 | 177 | ▲ 15.7% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 92.6% | 83.9% | ▼ 9.4% |
| February | 68.2% | 87.5% | ▲ 28.3% |
| March | 73.1% | 88.5% | ▲ 21.0% |
| April | 80.8% | 80.8% | 0.0% |
| May | 72.2% | 76.9% | ▲ 6.5% |
| June | 83.3% | 68.4% | ▼ 17.9% |
| July | 87.5% | 62.5% | ▼ 28.6% |
| August | 71.4% | – | – |
| September | 91.7% | – | – |
| October | 100.0% | – | in progress |
| November | 92.9% | – | – |
| December | 66.7% | – | – |
| Year-to-date average (Jan–Jul) | 79.7% | 78.3% | ▼ 1.7% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
Cancellation share
- Not cancelled 99.8% 462
- Cancelled 0.2% 1
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SEA SLC Seattle–Tacoma International Airport – Salt Lake City International Airport | 1,107 | 7.8 min | 81.4% | 463 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 91.7% | 0 |
| November 2024 | 16 | 16 | 93.8% | 0 |
| December 2024 | 29 | 29 | 89.7% | 0 |
| January 2025 | 27 | 27 | 92.6% | 0 |
| February 2025 | 22 | 22 | 68.2% | 0 |
| March 2025 | 26 | 26 | 73.1% | 0 |
| April 2025 | 26 | 26 | 80.8% | 0 |
| May 2025 | 18 | 18 | 72.2% | 0 |
| June 2025 | 18 | 18 | 83.3% | 0 |
| July 2025 | 16 | 16 | 87.5% | 0 |
| August 2025 | 14 | 14 | 71.4% | 0 |
| September 2025 | 12 | 12 | 91.7% | 0 |
| October 2025 | 15 | 15 | 100.0% | 0 |
| November 2025 | 14 | 14 | 92.9% | 0 |
| December 2025 | 21 | 21 | 66.7% | 0 |
| January 2026 | 31 | 31 | 83.9% | 0 |
| February 2026 | 24 | 24 | 87.5% | 0 |
| March 2026 | 27 | 26 | 88.5% | 1 |
| April 2026 | 26 | 26 | 80.8% | 0 |
| May 2026 | 26 | 26 | 76.9% | 0 |
| June 2026 | 19 | 19 | 68.4% | 0 |
| July 2026 | 24 | 24 | 62.5% | 0 |