WN4499
WN4499 (Southwest Airlines) is a multi-stop service on 21 routes, busiest San Francisco to Denver. Of 434 departures recorded from October 2024 to July 2026, 78.5% left on time, according to the US BTS.
- On-time departures78.5%of 434 flights
- Average delay11.5 min
- July 202621▼ 4.5%vs July 2025
- Cancelled0.5%
- Legs flown under this number21
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 | 9 | 28 | ▲ 211.1% |
| February | 6 | 28 | ▲ 366.7% |
| March | 28 | 54 | ▲ 92.9% |
| April | 7 | 14 | ▲ 100.0% |
| May | – | 4 | – |
| June | 18 | 20 | ▲ 11.1% |
| July | 22 | 21 | ▼ 4.5% |
| August | 25 | – | – |
| September | 26 | – | – |
| October | 22 | – | in progress |
| November | 25 | – | – |
| December | 20 | – | – |
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 | 77.8% | 75.0% | ▼ 3.6% |
| February | 100.0% | 57.1% | ▼ 42.9% |
| March | 78.6% | 57.4% | ▼ 26.9% |
| April | 42.9% | 100.0% | ▲ 133.3% |
| May | – | 50.0% | – |
| June | 100.0% | 75.0% | ▼ 25.0% |
| July | 90.9% | 71.4% | ▼ 21.4% |
| August | 88.0% | – | – |
| September | 92.3% | – | – |
| October | 77.3% | – | in progress |
| November | 83.3% | – | – |
| December | 95.0% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.5% 432
- Cancelled 0.5% 2
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | 21.4 min | 67.2% | 58 |
| BNA MCO Nashville International Airport – Orlando International Airport | 993 | 6.4 min | 90.0% | 50 |
| BWI CLE Baltimore/Washington International Thurgood Marshall Airport – Cleveland Hopkins International Airport | 505 | 5.3 min | 87.0% | 46 |
| SJC LAS Mineta San Jose International Airport – Harry Reid International Airport | 620 | 1.4 min | 95.1% | 42 |
| MDW JAX Chicago Midway International Airport – Jacksonville International Airport | 1,368 | 12.7 min | 73.2% | 41 |
| MCO IND Orlando International Airport – Indianapolis International Airport | 1,336 | 26.1 min | 69.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 21 | 21 | 100.0% | 0 |
| December 2024 | 16 | 16 | 50.0% | 0 |
| January 2025 | 9 | 9 | 77.8% | 0 |
| February 2025 | 6 | 6 | 100.0% | 0 |
| March 2025 | 28 | 28 | 78.6% | 0 |
| April 2025 | 7 | 7 | 42.9% | 0 |
| June 2025 | 18 | 17 | 100.0% | 1 |
| July 2025 | 22 | 22 | 90.9% | 0 |
| August 2025 | 25 | 25 | 88.0% | 0 |
| September 2025 | 26 | 26 | 92.3% | 0 |
| October 2025 | 22 | 22 | 77.3% | 0 |
| November 2025 | 25 | 24 | 83.3% | 1 |
| December 2025 | 20 | 20 | 95.0% | 0 |
| January 2026 | 28 | 28 | 75.0% | 0 |
| February 2026 | 28 | 28 | 57.1% | 0 |
| March 2026 | 54 | 54 | 57.4% | 0 |
| April 2026 | 14 | 14 | 100.0% | 0 |
| May 2026 | 4 | 4 | 50.0% | 0 |
| June 2026 | 20 | 20 | 75.0% | 0 |
| July 2026 | 21 | 21 | 71.4% | 0 |