WN4301
WN4301 (Southwest Airlines) is a multi-stop service on 15 routes, busiest San Francisco to Baltimore. Of 365 departures recorded from February 2025 to July 2026, 73.7% left on time, according to the US BTS.
- On-time departures73.7%of 365 flights
- Average delay15.5 min
- July 202652▲ 188.9%vs July 2025
- Cancelled0.0%
- 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 | – | 5 | – |
| February | 2 | – | – |
| March | 1 | – | – |
| April | 26 | 11 | ▼ 57.7% |
| May | 36 | 12 | ▼ 66.7% |
| June | 18 | 48 | ▲ 166.7% |
| July | 18 | 52 | ▲ 188.9% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 18 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
according to the US BTS · February 2025 → 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 | – | 20.0% | – |
| February | 100.0% | – | – |
| March | 100.0% | – | – |
| April | 73.1% | 100.0% | ▲ 36.8% |
| May | 55.6% | 100.0% | ▲ 80.0% |
| June | 88.9% | 58.3% | ▼ 34.4% |
| July | 94.4% | 57.7% | ▼ 38.9% |
| August | 96.6% | – | – |
| September | 93.3% | – | – |
| October | 94.4% | – | in progress |
| November | 64.3% | – | – |
| December | 67.7% | – | – |
according to the US BTS · February 2025 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · February 2025 → 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 | – | – |
| 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 · February 2025 → 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 100.0% 365
- Cancelled 0.0% 0
Share of all recorded flights in the period, all legs. · Feb 15, 2025 → Jul 31, 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 |
|---|---|---|---|---|
| SFO BWI San Francisco International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,944 | 24.2 min | 62.5% | 64 |
| SJC SNA Mineta San Jose International Airport – John Wayne Orange County International Airport | 550 | 3.3 min | 94.0% | 50 |
| PHX SAT Phoenix Sky Harbor International Airport – San Antonio International Airport | 1,354 | 20.8 min | 60.0% | 50 |
| LIT BNA Bill & Hillary Clinton National Airport/Adams Field – Nashville International Airport | 526 | 31.2 min | 57.1% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 1 | 1 | 100.0% | 0 |
| April 2025 | 26 | 26 | 73.1% | 0 |
| May 2025 | 36 | 36 | 55.6% | 0 |
| June 2025 | 18 | 18 | 88.9% | 0 |
| July 2025 | 18 | 18 | 94.4% | 0 |
| August 2025 | 29 | 29 | 96.6% | 0 |
| September 2025 | 30 | 30 | 93.3% | 0 |
| October 2025 | 18 | 18 | 94.4% | 0 |
| November 2025 | 28 | 28 | 64.3% | 0 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 5 | 5 | 20.0% | 0 |
| April 2026 | 11 | 11 | 100.0% | 0 |
| May 2026 | 12 | 12 | 100.0% | 0 |
| June 2026 | 48 | 48 | 58.3% | 0 |
| July 2026 | 52 | 52 | 57.7% | 0 |