WN3977
WN3977 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Sacramento to Ontario. Of 451 departures recorded from October 2024 to July 2026, 74.2% left on time, according to the US BTS.
- On-time departures74.2%of 451 flights
- Average delay13.0 min
- July 202616▼ 48.4%vs July 2025
- Cancelled1.1%
- Legs flown under this number19
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 10 | ▲ 233.3% |
| February | – | 19 | – |
| March | 30 | 29 | ▼ 3.3% |
| April | 31 | 16 | ▼ 48.4% |
| May | 30 | 13 | ▼ 56.7% |
| June | 30 | 16 | ▼ 46.7% |
| July | 31 | 16 | ▼ 48.4% |
| August | 30 | – | – |
| September | 30 | – | – |
| October | 5 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 60.0% | ▼ 40.0% |
| February | – | 63.2% | – |
| March | 76.7% | 92.6% | ▲ 20.8% |
| April | 64.5% | 81.3% | ▲ 25.9% |
| May | 66.7% | 84.6% | ▲ 26.9% |
| June | 48.3% | 50.0% | ▲ 3.6% |
| July | 26.7% | 62.5% | ▲ 134.3% |
| August | 96.7% | – | – |
| September | 100.0% | – | – |
| October | 40.0% | – | in progress |
| November | 100.0% | – | – |
| December | 76.7% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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 98.9% 446
- Cancelled 1.1% 5
Share of all recorded flights in the period, all legs. · Oct 14, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SMF ONT Sacramento International Airport – Ontario International Airport | 627 | 2.5 min | 87.3% | 64 |
| MKE DEN General Mitchell International Airport – Denver International Airport | 1,438 | 42.8 min | 34.5% | 60 |
| SRQ BWI Sarasota Bradenton International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,419 | 15.0 min | 68.4% | 57 |
| DJT MCO President Donald J. Trump International Airport – Orlando International Airport | 228 | -5.8 min | 100.0% | 57 |
| TPA DEN Tampa International Airport – Denver International Airport | 2,423 | 0.9 min | 96.8% | 33 |
| LAS GEG Harry Reid International Airport – Spokane International Airport | 1,298 | 11.7 min | 72.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 92.9% | 0 |
| November 2024 | 29 | 29 | 79.3% | 0 |
| December 2024 | 10 | 10 | 100.0% | 0 |
| January 2025 | 3 | 3 | 100.0% | 0 |
| March 2025 | 30 | 30 | 76.7% | 0 |
| April 2025 | 31 | 31 | 64.5% | 0 |
| May 2025 | 30 | 30 | 66.7% | 0 |
| June 2025 | 30 | 29 | 48.3% | 1 |
| July 2025 | 31 | 30 | 26.7% | 1 |
| August 2025 | 30 | 30 | 96.7% | 0 |
| September 2025 | 30 | 30 | 100.0% | 0 |
| October 2025 | 5 | 5 | 40.0% | 0 |
| November 2025 | 28 | 28 | 100.0% | 0 |
| December 2025 | 31 | 30 | 76.7% | 1 |
| January 2026 | 10 | 10 | 60.0% | 0 |
| February 2026 | 19 | 19 | 63.2% | 0 |
| March 2026 | 29 | 27 | 92.6% | 2 |
| April 2026 | 16 | 16 | 81.3% | 0 |
| May 2026 | 13 | 13 | 84.6% | 0 |
| June 2026 | 16 | 16 | 50.0% | 0 |
| July 2026 | 16 | 16 | 62.5% | 0 |