WN3991
WN3991 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Las Vegas to Sacramento. Of 389 departures recorded from October 2024 to July 2026, 82.6% left on time, according to the US BTS.
- On-time departures82.6%of 389 flights
- Average delay6.9 min
- July 202623▼ 32.4%vs July 2025
- Cancelled1.3%
- Legs flown under this number20
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 | 6 | 18 | ▲ 200.0% |
| February | – | 33 | – |
| March | 26 | 32 | ▲ 23.1% |
| April | 19 | 9 | ▼ 52.6% |
| May | 19 | 6 | ▼ 68.4% |
| June | 31 | 19 | ▼ 38.7% |
| July | 34 | 23 | ▼ 32.4% |
| August | 9 | – | – |
| September | 4 | – | – |
| October | 26 | – | in progress |
| November | 2 | – | – |
| December | 2 | – | – |
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 | 83.3% | 88.9% | ▲ 6.7% |
| February | – | 93.8% | – |
| March | 57.7% | 87.1% | ▲ 51.0% |
| April | 79.0% | 100.0% | ▲ 26.7% |
| May | 42.1% | 83.3% | ▲ 97.9% |
| June | 87.1% | 89.5% | ▲ 2.7% |
| July | 71.9% | 95.7% | ▲ 33.1% |
| August | 66.7% | – | – |
| September | 50.0% | – | – |
| October | 84.6% | – | in progress |
| November | 50.0% | – | – |
| December | 100.0% | – | – |
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 | – | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 2 | 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 98.7% 384
- Cancelled 1.3% 5
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS SMF Harry Reid International Airport – Sacramento International Airport | 639 | 3.5 min | 90.6% | 64 |
| SNA LAS John Wayne Orange County International Airport – Harry Reid International Airport | 365 | 8.7 min | 77.6% | 60 |
| STS BUR Charles M. Schulz Sonoma County Airport – Hollywood Burbank/Bob Hope Airport | 623 | 1.3 min | 92.9% | 42 |
| SAT MSY San Antonio International Airport – Louis Armstrong New Orleans International Airport | 794 | 1.6 min | 94.4% | 36 |
| STL MCI St. Louis Lambert International Airport – Kansas City International Airport | 380 | 12.5 min | 63.6% | 33 |
| MDW RSW Chicago Midway International Airport – Southwest Florida International Airport | 1,782 | 1.8 min | 87.5% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 11 | 11 | 100.0% | 0 |
| November 2024 | 28 | 28 | 89.3% | 0 |
| December 2024 | 32 | 32 | 93.8% | 0 |
| January 2025 | 6 | 6 | 83.3% | 0 |
| March 2025 | 26 | 26 | 57.7% | 0 |
| April 2025 | 19 | 19 | 79.0% | 0 |
| May 2025 | 19 | 19 | 42.1% | 0 |
| June 2025 | 31 | 31 | 87.1% | 0 |
| July 2025 | 34 | 32 | 71.9% | 2 |
| August 2025 | 9 | 9 | 66.7% | 0 |
| September 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 26 | 26 | 84.6% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| December 2025 | 2 | 1 | 100.0% | 1 |
| January 2026 | 18 | 18 | 88.9% | 0 |
| February 2026 | 33 | 32 | 93.8% | 1 |
| March 2026 | 32 | 31 | 87.1% | 1 |
| April 2026 | 9 | 9 | 100.0% | 0 |
| May 2026 | 6 | 6 | 83.3% | 0 |
| June 2026 | 19 | 19 | 89.5% | 0 |
| July 2026 | 23 | 23 | 95.7% | 0 |