WN3942
WN3942 (Southwest Airlines) is a multi-stop service on 21 routes, busiest Ontario to Denver. Of 368 departures recorded from October 2024 to July 2026, 79.1% left on time, according to the US BTS.
- On-time departures79.1%of 368 flights
- Average delay10.2 min
- July 202617▼ 56.4%vs July 2025
- Cancelled1.1%
- 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 periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 4 | ▲ 100.0% |
| February | – | 7 | – |
| March | – | 28 | – |
| April | 26 | 15 | ▼ 42.3% |
| May | 34 | 14 | ▼ 58.8% |
| June | 39 | 15 | ▼ 61.5% |
| July | 39 | 17 | ▼ 56.4% |
| August | 32 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 8 | – | – |
| December | 13 | – | – |
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 | 100.0% | 50.0% | ▼ 50.0% |
| February | – | 85.7% | – |
| March | – | 57.1% | – |
| April | 88.5% | 80.0% | ▼ 9.6% |
| May | 76.5% | 100.0% | ▲ 30.8% |
| June | 94.7% | 71.4% | ▼ 24.6% |
| July | 92.1% | 62.5% | ▼ 32.1% |
| August | 90.6% | – | – |
| September | 80.0% | – | – |
| October | 77.4% | – | in progress |
| November | 50.0% | – | – |
| December | 23.1% | – | – |
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 | – | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 1 | 0.0% |
| July | 1 | 1 | 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 98.9% 364
- Cancelled 1.1% 4
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ONT DEN Ontario International Airport – Denver International Airport | 1,316 | 8.8 min | 84.5% | 58 |
| MDW TPA Chicago Midway International Airport – Tampa International Airport | 1,607 | 5.9 min | 90.2% | 42 |
| SDF MDW Louisville Muhammad Ali International Airport – Chicago Midway International Airport | 437 | -1.5 min | 100.0% | 36 |
| MCI PHX Kansas City International Airport – Phoenix Sky Harbor International Airport | 1,677 | 13.9 min | 76.5% | 34 |
| PHX SJC Phoenix Sky Harbor International Airport – Mineta San Jose International Airport | 999 | 12.3 min | 77.4% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 50.0% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| December 2024 | 8 | 8 | 100.0% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| April 2025 | 26 | 26 | 88.5% | 0 |
| May 2025 | 34 | 34 | 76.5% | 0 |
| June 2025 | 39 | 38 | 94.7% | 1 |
| July 2025 | 39 | 38 | 92.1% | 1 |
| August 2025 | 32 | 32 | 90.6% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 31 | 77.4% | 0 |
| November 2025 | 8 | 8 | 50.0% | 0 |
| December 2025 | 13 | 13 | 23.1% | 0 |
| January 2026 | 4 | 4 | 50.0% | 0 |
| February 2026 | 7 | 7 | 85.7% | 0 |
| March 2026 | 28 | 28 | 57.1% | 0 |
| April 2026 | 15 | 15 | 80.0% | 0 |
| May 2026 | 14 | 14 | 100.0% | 0 |
| June 2026 | 15 | 14 | 71.4% | 1 |
| July 2026 | 17 | 16 | 62.5% | 1 |