WN3987
WN3987 (Southwest Airlines) is a multi-stop service on 23 routes, busiest Dallas to Denver. Of 456 departures recorded from October 2024 to July 2026, 78.2% left on time, according to the US BTS.
- On-time departures78.2%of 456 flights
- Average delay12.2 min
- July 202616▼ 48.4%vs July 2025
- Cancelled0.7%
- Legs flown under this number23
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 27 | 5 | ▼ 81.5% |
| February | 23 | 17 | ▼ 26.1% |
| March | 26 | 14 | ▼ 46.2% |
| April | 6 | 36 | ▲ 500.0% |
| May | 1 | 44 | ▲ 4,300.0% |
| June | 26 | 19 | ▼ 26.9% |
| July | 31 | 16 | ▼ 48.4% |
| August | 26 | – | – |
| September | 26 | – | – |
| October | 5 | – | in progress |
| November | 26 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 140 | 151 | ▲ 7.9% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 88.5% | 80.0% | ▼ 9.6% |
| February | 65.2% | 100.0% | ▲ 53.3% |
| March | 76.9% | 71.4% | ▼ 7.1% |
| April | 83.3% | 69.4% | ▼ 16.7% |
| May | 100.0% | 56.8% | ▼ 43.2% |
| June | 84.6% | 79.0% | ▼ 6.7% |
| July | 80.7% | 75.0% | ▼ 7.0% |
| August | 88.5% | – | – |
| September | 84.6% | – | – |
| October | 60.0% | – | in progress |
| November | 92.3% | – | – |
| December | 89.7% | – | – |
| Year-to-date average (Jan–Jul) | 82.7% | 75.9% | ▼ 8.2% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 1 | – |
| March | 0 | 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 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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% 453
- Cancelled 0.7% 3
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| DAL DEN Dallas Love Field – Denver International Airport | 1,048 | 10.1 min | 78.5% | 67 |
| MKE RSW General Mitchell International Airport – Southwest Florida International Airport | 1,908 | 9.0 min | 78.3% | 60 |
| ONT PHX Ontario International Airport – Phoenix Sky Harbor International Airport | 522 | 1.6 min | 90.9% | 55 |
| SNA SJC John Wayne Orange County International Airport – Mineta San Jose International Airport | 550 | 2.9 min | 91.8% | 49 |
| MAF HOU Midland International Air and Space Port – William P. Hobby Airport | 709 | 31.7 min | 71.4% | 42 |
| HOU MSY William P. Hobby Airport – Louis Armstrong New Orleans International Airport | 485 | 28.4 min | 52.5% | 40 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 58.8% | 0 |
| November 2024 | 20 | 19 | 79.0% | 1 |
| December 2024 | 16 | 16 | 81.3% | 0 |
| January 2025 | 27 | 26 | 88.5% | 1 |
| February 2025 | 23 | 23 | 65.2% | 0 |
| March 2025 | 26 | 26 | 76.9% | 0 |
| April 2025 | 6 | 6 | 83.3% | 0 |
| May 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 26 | 26 | 84.6% | 0 |
| July 2025 | 31 | 31 | 80.7% | 0 |
| August 2025 | 26 | 26 | 88.5% | 0 |
| September 2025 | 26 | 26 | 84.6% | 0 |
| October 2025 | 5 | 5 | 60.0% | 0 |
| November 2025 | 26 | 26 | 92.3% | 0 |
| December 2025 | 29 | 29 | 89.7% | 0 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| February 2026 | 17 | 16 | 100.0% | 1 |
| March 2026 | 14 | 14 | 71.4% | 0 |
| April 2026 | 36 | 36 | 69.4% | 0 |
| May 2026 | 44 | 44 | 56.8% | 0 |
| June 2026 | 19 | 19 | 79.0% | 0 |
| July 2026 | 16 | 16 | 75.0% | 0 |