WN3878
WN3878 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Phoenix to Louisville. Of 290 departures recorded from October 2024 to July 2026, 65.5% left on time, according to the US BTS.
- On-time departures65.5%of 290 flights
- Average delay18.6 min
- July 20264▼ 78.9%vs July 2025
- Cancelled1.0%
- Legs flown under this number20
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 | 10 | 3 | ▼ 70.0% |
| February | 7 | – | – |
| March | 27 | 15 | ▼ 44.4% |
| April | 7 | 21 | ▲ 200.0% |
| May | – | 21 | – |
| June | 14 | 8 | ▼ 42.9% |
| July | 19 | 4 | ▼ 78.9% |
| August | 5 | – | – |
| September | 4 | – | – |
| October | 30 | – | in progress |
| November | 6 | – | – |
| December | 11 | – | – |
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 | 90.0% | 33.3% | ▼ 63.0% |
| February | 100.0% | – | – |
| March | 69.2% | 53.9% | ▼ 22.2% |
| April | 42.9% | 33.3% | ▼ 22.2% |
| May | – | 57.1% | – |
| June | 71.4% | 37.5% | ▼ 47.5% |
| July | 73.7% | 0.0% | ▼ 100.0% |
| August | 80.0% | – | – |
| September | 75.0% | – | – |
| October | 80.0% | – | in progress |
| November | 50.0% | – | – |
| December | 9.1% | – | – |
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 | 0 | – |
| February | 0 | – | – |
| March | 1 | 2 | ▲ 100.0% |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.0% 287
- Cancelled 1.0% 3
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 26, 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 |
|---|---|---|---|---|
| PHX SDF Phoenix Sky Harbor International Airport – Louisville Muhammad Ali International Airport | 2,418 | 24.8 min | 45.2% | 42 |
| MDW PHL Chicago Midway International Airport – Philadelphia International Airport | 1,073 | 13.1 min | 71.4% | 35 |
| PHX DAL Phoenix Sky Harbor International Airport – Dallas Love Field | 1,412 | 15.3 min | 62.5% | 33 |
| MDW PIT Chicago Midway International Airport – Pittsburgh International Airport | 646 | 10.2 min | 80.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 93.8% | 0 |
| November 2024 | 38 | 38 | 71.1% | 0 |
| December 2024 | 24 | 24 | 83.3% | 0 |
| January 2025 | 10 | 10 | 90.0% | 0 |
| February 2025 | 7 | 7 | 100.0% | 0 |
| March 2025 | 27 | 26 | 69.2% | 1 |
| April 2025 | 7 | 7 | 42.9% | 0 |
| June 2025 | 14 | 14 | 71.4% | 0 |
| July 2025 | 19 | 19 | 73.7% | 0 |
| August 2025 | 5 | 5 | 80.0% | 0 |
| September 2025 | 4 | 4 | 75.0% | 0 |
| October 2025 | 30 | 30 | 80.0% | 0 |
| November 2025 | 6 | 6 | 50.0% | 0 |
| December 2025 | 11 | 11 | 9.1% | 0 |
| January 2026 | 3 | 3 | 33.3% | 0 |
| March 2026 | 15 | 13 | 53.9% | 2 |
| April 2026 | 21 | 21 | 33.3% | 0 |
| May 2026 | 21 | 21 | 57.1% | 0 |
| June 2026 | 8 | 8 | 37.5% | 0 |
| July 2026 | 4 | 4 | 0.0% | 0 |