WN4387
WN4387 (Southwest Airlines) is a multi-stop service on 14 routes, busiest Indianapolis to Denver. Of 245 departures recorded from October 2024 to July 2026, 70.8% left on time, according to the US BTS.
- On-time departures70.8%of 245 flights
- Average delay16.7 min
- July 202621▲ 425.0%vs July 2025
- Cancelled0.8%
- 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 periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 5 | 26 | ▲ 420.0% |
| February | 8 | 28 | ▲ 250.0% |
| March | 23 | 8 | ▼ 65.2% |
| April | 6 | 1 | ▼ 83.3% |
| May | – | – | – |
| June | 4 | 8 | ▲ 100.0% |
| July | 4 | 21 | ▲ 425.0% |
| August | 1 | – | – |
| September | – | – | – |
| October | 43 | – | in progress |
| November | 2 | – | – |
| December | – | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 20.0% | 84.0% | ▲ 320.0% |
| February | 62.5% | 92.9% | ▲ 48.6% |
| March | 52.2% | 42.9% | ▼ 17.8% |
| April | 83.3% | 100.0% | ▲ 20.0% |
| May | – | – | – |
| June | 50.0% | 62.5% | ▲ 25.0% |
| July | 75.0% | 52.4% | ▼ 30.2% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 51.2% | – | in progress |
| November | 100.0% | – | – |
| December | – | – | – |
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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | – | – | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
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 99.2% 243
- Cancelled 0.8% 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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| IND DEN Indianapolis International Airport – Denver International Airport | 1,568 | 6.1 min | 86.0% | 58 |
| BWI CHS Baltimore/Washington International Thurgood Marshall Airport – Charleston International Airport | 761 | 10.3 min | 82.4% | 51 |
| SAN SFO San Diego International Airport – San Francisco International Airport | 719 | 32.5 min | 51.6% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 100.0% | 0 |
| November 2024 | 26 | 26 | 84.6% | 0 |
| December 2024 | 22 | 22 | 95.5% | 0 |
| January 2025 | 5 | 5 | 20.0% | 0 |
| February 2025 | 8 | 8 | 62.5% | 0 |
| March 2025 | 23 | 23 | 52.2% | 0 |
| April 2025 | 6 | 6 | 83.3% | 0 |
| June 2025 | 4 | 4 | 50.0% | 0 |
| July 2025 | 4 | 4 | 75.0% | 0 |
| August 2025 | 1 | 1 | 100.0% | 0 |
| October 2025 | 43 | 43 | 51.2% | 0 |
| November 2025 | 2 | 2 | 100.0% | 0 |
| January 2026 | 26 | 25 | 84.0% | 1 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 8 | 7 | 42.9% | 1 |
| April 2026 | 1 | 1 | 100.0% | 0 |
| June 2026 | 8 | 8 | 62.5% | 0 |
| July 2026 | 21 | 21 | 52.4% | 0 |