WN4149
WN4149 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Las Vegas to Ontario. Of 363 departures recorded from October 2024 to July 2026, 82.3% left on time, according to the US BTS.
- On-time departures82.3%of 363 flights
- Average delay9.5 min
- July 202630▲ 15.4%vs July 2025
- Cancelled0.6%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 29 | 4 | ▼ 86.2% |
| February | 28 | – | – |
| March | 5 | – | – |
| April | 3 | 3 | 0.0% |
| May | 4 | 5 | ▲ 25.0% |
| June | 23 | 23 | 0.0% |
| July | 26 | 30 | ▲ 15.4% |
| August | 30 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 23 | – | – |
| December | 27 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 77.8% | 75.0% | ▼ 3.6% |
| February | 82.1% | – | – |
| March | 100.0% | – | – |
| April | 100.0% | 0.0% | ▼ 100.0% |
| May | 75.0% | 100.0% | ▲ 33.3% |
| June | 91.3% | 78.3% | ▼ 14.3% |
| July | 88.5% | 96.7% | ▲ 9.3% |
| August | 93.3% | – | – |
| September | 90.0% | – | – |
| October | 100.0% | – | in progress |
| November | 69.6% | – | – |
| December | 44.4% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 0 | ▼ 100.0% |
| February | 0 | – | – |
| March | 0 | – | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | 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 99.4% 361
- Cancelled 0.6% 2
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS ONT Harry Reid International Airport – Ontario International Airport | 317 | 5.1 min | 85.7% | 93 |
| PWM BWI Portland International Jetport – Baltimore/Washington International Thurgood Marshall Airport | 727 | 9.9 min | 91.4% | 58 |
| ONT SMF Ontario International Airport – Sacramento International Airport | 627 | 8.1 min | 90.2% | 51 |
| BNA AUS Nashville International Airport – Austin Bergstrom International Airport | 1,215 | 3.1 min | 88.0% | 50 |
| PHX STL Phoenix Sky Harbor International Airport – St. Louis Lambert International Airport | 2,026 | 31.6 min | 53.7% | 41 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 35 | 35 | 82.9% | 0 |
| December 2024 | 24 | 24 | 87.5% | 0 |
| January 2025 | 29 | 27 | 77.8% | 2 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 5 | 5 | 100.0% | 0 |
| April 2025 | 3 | 3 | 100.0% | 0 |
| May 2025 | 4 | 4 | 75.0% | 0 |
| June 2025 | 23 | 23 | 91.3% | 0 |
| July 2025 | 26 | 26 | 88.5% | 0 |
| August 2025 | 30 | 30 | 93.3% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 23 | 23 | 69.6% | 0 |
| December 2025 | 27 | 27 | 44.4% | 0 |
| January 2026 | 4 | 4 | 75.0% | 0 |
| April 2026 | 3 | 3 | 0.0% | 0 |
| May 2026 | 5 | 5 | 100.0% | 0 |
| June 2026 | 23 | 23 | 78.3% | 0 |
| July 2026 | 30 | 30 | 96.7% | 0 |