WN4638
WN4638 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Reno to Phoenix. Of 264 departures recorded from October 2024 to July 2026, 61.6% left on time, according to the US BTS.
- On-time departures61.6%of 264 flights
- Average delay20.9 min
- July 202627▲ 58.8%vs July 2025
- Cancelled0.4%
- Legs flown under this number16
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 5 | – |
| February | – | 11 | – |
| March | 24 | 1 | ▼ 95.8% |
| April | 6 | 37 | ▲ 516.7% |
| May | 3 | 48 | ▲ 1,500.0% |
| June | 17 | 27 | ▲ 58.8% |
| July | 17 | 27 | ▲ 58.8% |
| August | 3 | – | – |
| September | – | – | – |
| October | 13 | – | in progress |
| November | 3 | – | – |
| December | 3 | – | – |
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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 80.0% | – |
| February | – | 72.7% | – |
| March | 58.3% | 100.0% | ▲ 71.4% |
| April | 33.3% | 29.7% | ▼ 10.8% |
| May | 100.0% | 43.8% | ▼ 56.3% |
| June | 76.5% | 85.2% | ▲ 11.4% |
| July | 70.6% | 85.2% | ▲ 20.7% |
| August | 33.3% | – | – |
| September | – | – | – |
| October | 69.2% | – | in progress |
| November | 66.7% | – | – |
| December | 0.0% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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 99.6% 263
- Cancelled 0.4% 1
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| RNO PHX Reno Tahoe International Airport – Phoenix Sky Harbor International Airport | 967 | 29.4 min | 46.6% | 58 |
| FLL BNA Fort Lauderdale Hollywood International Airport – Nashville International Airport | 1,278 | 7.0 min | 88.0% | 50 |
| DEN SJC Denver International Airport – Mineta San Jose International Airport | 1,522 | 16.9 min | 64.5% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 76.5% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| March 2025 | 24 | 24 | 58.3% | 0 |
| April 2025 | 6 | 6 | 33.3% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 17 | 17 | 76.5% | 0 |
| July 2025 | 17 | 17 | 70.6% | 0 |
| August 2025 | 3 | 3 | 33.3% | 0 |
| October 2025 | 13 | 13 | 69.2% | 0 |
| November 2025 | 3 | 3 | 66.7% | 0 |
| December 2025 | 3 | 2 | 0.0% | 1 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| February 2026 | 11 | 11 | 72.7% | 0 |
| March 2026 | 1 | 1 | 100.0% | 0 |
| April 2026 | 37 | 37 | 29.7% | 0 |
| May 2026 | 48 | 48 | 43.8% | 0 |
| June 2026 | 27 | 27 | 85.2% | 0 |
| July 2026 | 27 | 27 | 85.2% | 0 |