WN4307
WN4307 (Southwest Airlines) is a multi-stop service on 14 routes, busiest Salt Lake City to Denver. Of 314 departures recorded from October 2024 to July 2026, 78.6% left on time, according to the US BTS.
- On-time departures78.6%of 314 flights
- Average delay10.8 min
- July 202623▲ 475.0%vs July 2025
- Cancelled1.6%
- Legs flown under this number14
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 9 | 2 | ▼ 77.8% |
| February | 15 | 1 | ▼ 93.3% |
| March | 32 | 27 | ▼ 15.6% |
| April | 31 | 6 | ▼ 80.6% |
| May | 31 | – | – |
| June | 8 | 19 | ▲ 137.5% |
| July | 4 | 23 | ▲ 475.0% |
| August | 1 | – | – |
| September | – | – | – |
| October | 26 | – | in progress |
| November | 23 | – | – |
| December | 19 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 66.7% | 0.0% | ▼ 100.0% |
| February | 84.6% | 0.0% | ▼ 100.0% |
| March | 84.4% | 68.0% | ▼ 19.4% |
| April | 93.6% | 83.3% | ▼ 10.9% |
| May | 93.6% | – | – |
| June | 100.0% | 57.9% | ▼ 42.1% |
| July | 100.0% | 73.9% | ▼ 26.1% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 80.8% | – | in progress |
| November | 56.5% | – | – |
| December | 63.2% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 2 | 0 | ▼ 100.0% |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| 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 98.4% 309
- Cancelled 1.6% 5
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | -1.6 min | 96.6% | 58 |
| RNO LAS Reno Tahoe International Airport – Harry Reid International Airport | 556 | 1.3 min | 90.2% | 53 |
| SFO LAX San Francisco International Airport – Los Angeles International Airport | 543 | 33.2 min | 58.1% | 44 |
| LGB SJC Long Beach International Airport – Mineta San Jose International Airport | 522 | 11.0 min | 65.9% | 41 |
| PVD MDW Rhode Island T. F. Green International Airport – Chicago Midway International Airport | 1,352 | 17.5 min | 71.0% | 33 |
| ABQ PHX Albuquerque International Sunport – Phoenix Sky Harbor International Airport | 527 | 9.2 min | 84.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 75.0% | 0 |
| November 2024 | 17 | 17 | 94.1% | 0 |
| December 2024 | 16 | 16 | 81.3% | 0 |
| January 2025 | 9 | 9 | 66.7% | 0 |
| February 2025 | 15 | 13 | 84.6% | 2 |
| March 2025 | 32 | 32 | 84.4% | 0 |
| April 2025 | 31 | 31 | 93.6% | 0 |
| May 2025 | 31 | 31 | 93.6% | 0 |
| June 2025 | 8 | 8 | 100.0% | 0 |
| July 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 1 | 1 | 100.0% | 0 |
| October 2025 | 26 | 26 | 80.8% | 0 |
| November 2025 | 23 | 23 | 56.5% | 0 |
| December 2025 | 19 | 19 | 63.2% | 0 |
| January 2026 | 2 | 1 | 0.0% | 1 |
| February 2026 | 1 | 1 | 0.0% | 0 |
| March 2026 | 27 | 25 | 68.0% | 2 |
| April 2026 | 6 | 6 | 83.3% | 0 |
| June 2026 | 19 | 19 | 57.9% | 0 |
| July 2026 | 23 | 23 | 73.9% | 0 |