WN4518
WN4518 (Southwest Airlines) is a multi-stop service on 15 routes, busiest San Diego to San Antonio. Of 461 departures recorded from October 2024 to July 2026, 67.5% left on time, according to the US BTS.
- On-time departures67.5%of 461 flights
- Average delay16.8 min
- July 202630▲ 42.9%vs July 2025
- Cancelled0.7%
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 31 | – |
| February | – | 26 | – |
| March | 26 | 31 | ▲ 19.2% |
| April | 27 | 38 | ▲ 40.7% |
| May | 26 | 39 | ▲ 50.0% |
| June | 24 | 32 | ▲ 33.3% |
| July | 21 | 30 | ▲ 42.9% |
| August | 4 | – | – |
| September | – | – | – |
| October | 29 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
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 | – | 73.3% | – |
| February | – | 84.6% | – |
| March | 61.5% | 100.0% | ▲ 62.5% |
| April | 66.7% | 89.5% | ▲ 34.2% |
| May | 57.7% | 79.5% | ▲ 37.8% |
| June | 66.7% | 37.5% | ▼ 43.8% |
| July | 71.4% | 26.7% | ▼ 62.7% |
| August | 75.0% | – | – |
| September | – | – | – |
| October | 55.2% | – | in progress |
| November | 60.7% | – | – |
| December | 67.7% | – | – |
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 | – | 1 | – |
| February | – | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 99.3% 458
- Cancelled 0.7% 3
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
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SAN SAT San Diego International Airport – San Antonio International Airport | 1,814 | 20.1 min | 61.9% | 64 |
| MSY BNA Louis Armstrong New Orleans International Airport – Nashville International Airport | 759 | 5.2 min | 89.7% | 58 |
| BNA CLT Nashville International Airport – Charlotte Douglas International Airport | 528 | 42.9 min | 26.8% | 56 |
| PHX MKE Phoenix Sky Harbor International Airport – General Mitchell International Airport | 2,346 | 19.7 min | 66.0% | 50 |
| LAX MCI Los Angeles International Airport – Kansas City International Airport | 2,190 | 5.8 min | 84.8% | 47 |
| SJC SAN Mineta San Jose International Airport – San Diego International Airport | 671 | 10.7 min | 71.1% | 45 |
| SNA SMF John Wayne Orange County International Airport – Sacramento International Airport | 650 | -2.9 min | 93.8% | 33 |
| SMF LAS Sacramento International Airport – Harry Reid International Airport | 639 | 22.8 min | 56.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 75.0% | 0 |
| November 2024 | 1 | 1 | 100.0% | 0 |
| March 2025 | 26 | 26 | 61.5% | 0 |
| April 2025 | 27 | 27 | 66.7% | 0 |
| May 2025 | 26 | 26 | 57.7% | 0 |
| June 2025 | 24 | 24 | 66.7% | 0 |
| July 2025 | 21 | 21 | 71.4% | 0 |
| August 2025 | 4 | 4 | 75.0% | 0 |
| October 2025 | 29 | 29 | 55.2% | 0 |
| November 2025 | 29 | 28 | 60.7% | 1 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 31 | 30 | 73.3% | 1 |
| February 2026 | 26 | 26 | 84.6% | 0 |
| March 2026 | 31 | 30 | 100.0% | 1 |
| April 2026 | 38 | 38 | 89.5% | 0 |
| May 2026 | 39 | 39 | 79.5% | 0 |
| June 2026 | 32 | 32 | 37.5% | 0 |
| July 2026 | 30 | 30 | 26.7% | 0 |