WN4249
WN4249 (Southwest Airlines) is a multi-stop service on 18 routes, busiest San Francisco to Las Vegas. Of 576 departures recorded from October 2024 to July 2026, 71.0% left on time, according to the US BTS.
- On-time departures71.0%of 576 flights
- Average delay13.8 min
- July 202629▲ 38.1%vs July 2025
- Cancelled1.7%
- Legs flown under this number18
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 | 42 | 29 | ▼ 31.0% |
| February | 25 | 28 | ▲ 12.0% |
| March | 21 | 27 | ▲ 28.6% |
| April | 30 | 37 | ▲ 23.3% |
| May | 34 | 38 | ▲ 11.8% |
| June | 25 | 32 | ▲ 28.0% |
| July | 21 | 29 | ▲ 38.1% |
| August | 15 | – | – |
| September | 13 | – | – |
| October | – | – | in progress |
| November | 24 | – | – |
| December | 26 | – | – |
| Year to date (Jan–Jul) | 198 | 220 | ▲ 11.1% |
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 | 81.0% | 93.1% | ▲ 15.0% |
| February | 75.0% | 100.0% | ▲ 33.3% |
| March | 80.0% | 74.1% | ▼ 7.4% |
| April | 63.3% | 81.1% | ▲ 28.0% |
| May | 58.8% | 60.5% | ▲ 2.9% |
| June | 70.8% | 28.1% | ▼ 60.3% |
| July | 71.4% | 30.8% | ▼ 56.9% |
| August | 60.0% | – | – |
| September | 84.6% | – | – |
| October | – | – | in progress |
| November | 91.7% | – | – |
| December | 96.0% | – | – |
| Year-to-date average (Jan–Jul) | 71.5% | 66.8% | ▼ 6.5% |
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 | 0 | ▼ 100.0% |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 3 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 3 | 3 | 0.0% |
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 98.3% 566
- Cancelled 1.7% 10
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 |
|---|---|---|---|---|
| SFO LAS San Francisco International Airport – Harry Reid International Airport | 665 | 26.8 min | 47.1% | 107 |
| MKE LAS General Mitchell International Airport – Harry Reid International Airport | 2,447 | -1.0 min | 98.3% | 58 |
| SAN SFO San Diego International Airport – San Francisco International Airport | 719 | -0.4 min | 92.3% | 53 |
| SAN AUS San Diego International Airport – Austin Bergstrom International Airport | 1,871 | 9.8 min | 84.4% | 45 |
| PHX MDW Phoenix Sky Harbor International Airport – Chicago Midway International Airport | 2,319 | 16.3 min | 68.2% | 45 |
| SJC LGB Mineta San Jose International Airport – Long Beach International Airport | 522 | 10.1 min | 73.8% | 42 |
| LGB PHX Long Beach International Airport – Phoenix Sky Harbor International Airport | 570 | 8.6 min | 66.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 45 | 45 | 64.4% | 0 |
| December 2024 | 15 | 12 | 58.3% | 3 |
| January 2025 | 42 | 42 | 81.0% | 0 |
| February 2025 | 25 | 24 | 75.0% | 1 |
| March 2025 | 21 | 20 | 80.0% | 1 |
| April 2025 | 30 | 30 | 63.3% | 0 |
| May 2025 | 34 | 34 | 58.8% | 0 |
| June 2025 | 25 | 24 | 70.8% | 1 |
| July 2025 | 21 | 21 | 71.4% | 0 |
| August 2025 | 15 | 15 | 60.0% | 0 |
| September 2025 | 13 | 13 | 84.6% | 0 |
| November 2025 | 24 | 24 | 91.7% | 0 |
| December 2025 | 26 | 25 | 96.0% | 1 |
| January 2026 | 29 | 29 | 93.1% | 0 |
| February 2026 | 28 | 28 | 100.0% | 0 |
| March 2026 | 27 | 27 | 74.1% | 0 |
| April 2026 | 37 | 37 | 81.1% | 0 |
| May 2026 | 38 | 38 | 60.5% | 0 |
| June 2026 | 32 | 32 | 28.1% | 0 |
| July 2026 | 29 | 26 | 30.8% | 3 |