WN4236
WN4236 (Southwest Airlines) is a multi-stop service on 35 routes, busiest Reno to Las Vegas. Of 461 departures recorded from October 2024 to July 2026, 70.5% left on time, according to the US BTS.
- On-time departures70.5%of 461 flights
- Average delay17.0 min
- July 202617▼ 32.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number35
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 5 | ▼ 83.9% |
| February | 40 | 3 | ▼ 92.5% |
| March | 37 | 43 | ▲ 16.2% |
| April | 24 | 20 | ▼ 16.7% |
| May | 16 | 12 | ▼ 25.0% |
| June | 28 | 17 | ▼ 39.3% |
| July | 25 | 17 | ▼ 32.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 5 | – | in progress |
| November | 20 | – | – |
| December | 16 | – | – |
| Year to date (Jan–Jul) | 201 | 117 | ▼ 41.8% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 80.7% | 40.0% | ▼ 50.4% |
| February | 57.9% | 66.7% | ▲ 15.2% |
| March | 71.4% | 72.1% | ▲ 0.9% |
| April | 70.8% | 85.0% | ▲ 20.0% |
| May | 43.8% | 41.7% | ▼ 4.8% |
| June | 75.0% | 58.8% | ▼ 21.6% |
| July | 100.0% | 41.2% | ▼ 58.8% |
| August | 87.1% | – | – |
| September | 86.7% | – | – |
| October | 100.0% | – | in progress |
| November | 30.0% | – | – |
| December | 62.5% | – | – |
| Year-to-date average (Jan–Jul) | 71.4% | 57.9% | ▼ 18.8% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 2 | 0 | ▼ 100.0% |
| March | 2 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 0 | ▼ 100.0% |
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 99.1% 457
- Cancelled 0.9% 4
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| RNO LAS Reno Tahoe International Airport – Harry Reid International Airport | 556 | 15.1 min | 78.3% | 85 |
| PHX LAX Phoenix Sky Harbor International Airport – Los Angeles International Airport | 595 | 5.1 min | 88.9% | 45 |
| SAT ELP San Antonio International Airport – El Paso International Airport | 797 | 4.7 min | 84.6% | 39 |
| PHX OAK Phoenix Sky Harbor International Airport – Oakland San Francisco Bay Airport | 1,039 | 13.0 min | 69.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 70.0% | 0 |
| November 2024 | 12 | 12 | 75.0% | 0 |
| December 2024 | 19 | 19 | 84.2% | 0 |
| January 2025 | 31 | 31 | 80.7% | 0 |
| February 2025 | 40 | 38 | 57.9% | 2 |
| March 2025 | 37 | 35 | 71.4% | 2 |
| April 2025 | 24 | 24 | 70.8% | 0 |
| May 2025 | 16 | 16 | 43.8% | 0 |
| June 2025 | 28 | 28 | 75.0% | 0 |
| July 2025 | 25 | 25 | 100.0% | 0 |
| August 2025 | 31 | 31 | 87.1% | 0 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 5 | 5 | 100.0% | 0 |
| November 2025 | 20 | 20 | 30.0% | 0 |
| December 2025 | 16 | 16 | 62.5% | 0 |
| January 2026 | 5 | 5 | 40.0% | 0 |
| February 2026 | 3 | 3 | 66.7% | 0 |
| March 2026 | 43 | 43 | 72.1% | 0 |
| April 2026 | 20 | 20 | 85.0% | 0 |
| May 2026 | 12 | 12 | 41.7% | 0 |
| June 2026 | 17 | 17 | 58.8% | 0 |
| July 2026 | 17 | 17 | 41.2% | 0 |