WN3957
WN3957 (Southwest Airlines) is a multi-stop service on 22 routes, busiest Denver to Reno. Of 550 departures recorded from October 2024 to July 2026, 73.6% left on time, according to the US BTS.
- On-time departures73.6%of 550 flights
- Average delay14.2 min
- July 202630▲ 20.0%vs July 2025
- Cancelled1.6%
- Legs flown under this number22
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 | 22 | 4 | ▼ 81.8% |
| February | 48 | 20 | ▼ 58.3% |
| March | 32 | 10 | ▼ 68.8% |
| April | 7 | 26 | ▲ 271.4% |
| May | – | 31 | – |
| June | 16 | 30 | ▲ 87.5% |
| July | 25 | 30 | ▲ 20.0% |
| August | 27 | – | – |
| September | 30 | – | – |
| October | 14 | – | in progress |
| November | 18 | – | – |
| December | 15 | – | – |
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 | 59.1% | 75.0% | ▲ 26.9% |
| February | 64.4% | 55.0% | ▼ 14.6% |
| March | 67.7% | 70.0% | ▲ 3.3% |
| April | 57.1% | 92.3% | ▲ 61.6% |
| May | – | 96.8% | – |
| June | 68.8% | 56.7% | ▼ 17.6% |
| July | 64.0% | 53.3% | ▼ 16.7% |
| August | 88.9% | – | – |
| September | 100.0% | – | – |
| October | 23.1% | – | in progress |
| November | 61.1% | – | – |
| December | 60.0% | – | – |
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 | 3 | 0 | ▼ 100.0% |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
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 98.4% 541
- Cancelled 1.6% 9
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN RNO Denver International Airport – Reno Tahoe International Airport | 1,291 | 12.9 min | 70.8% | 74 |
| PSP LAS Palm Springs International Airport – Harry Reid International Airport | 279 | -3.3 min | 94.8% | 58 |
| STL MDW St. Louis Lambert International Airport – Chicago Midway International Airport | 404 | 30.6 min | 52.6% | 57 |
| ONT SJC Ontario International Airport – Mineta San Jose International Airport | 536 | -2.0 min | 96.5% | 57 |
| RNO SAN Reno Tahoe International Airport – San Diego International Airport | 787 | 10.0 min | 78.1% | 43 |
| OKC STL OKC Will Rogers World Airport – St. Louis Lambert International Airport | 742 | 27.5 min | 63.9% | 36 |
| MCO IND Orlando International Airport – Indianapolis International Airport | 1,336 | 18.0 min | 68.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 67 | 65 | 83.1% | 2 |
| December 2024 | 58 | 56 | 82.1% | 2 |
| January 2025 | 22 | 22 | 59.1% | 0 |
| February 2025 | 48 | 45 | 64.4% | 3 |
| March 2025 | 32 | 31 | 67.7% | 1 |
| April 2025 | 7 | 7 | 57.1% | 0 |
| June 2025 | 16 | 16 | 68.8% | 0 |
| July 2025 | 25 | 25 | 64.0% | 0 |
| August 2025 | 27 | 27 | 88.9% | 0 |
| September 2025 | 30 | 30 | 100.0% | 0 |
| October 2025 | 14 | 13 | 23.1% | 1 |
| November 2025 | 18 | 18 | 61.1% | 0 |
| December 2025 | 15 | 15 | 60.0% | 0 |
| January 2026 | 4 | 4 | 75.0% | 0 |
| February 2026 | 20 | 20 | 55.0% | 0 |
| March 2026 | 10 | 10 | 70.0% | 0 |
| April 2026 | 26 | 26 | 92.3% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 30 | 30 | 56.7% | 0 |
| July 2026 | 30 | 30 | 53.3% | 0 |