WN1558
WN1558 (Southwest Airlines) is a multi-stop service on 34 routes, busiest Denver to Ontario. Of 654 departures recorded from October 2024 to July 2026, 65.8% left on time, according to the US BTS.
- On-time departures65.8%of 654 flights
- Average delay17.4 min
- July 202616▼ 62.8%vs July 2025
- Cancelled0.8%
- Legs flown under this number34
according to the US BTS · Oct 13, 2024 → Jul 29, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 29 | 14 | ▼ 51.7% |
| February | 24 | 29 | ▲ 20.8% |
| March | 30 | 30 | 0.0% |
| April | 27 | 27 | 0.0% |
| May | 26 | 26 | 0.0% |
| June | 42 | 18 | ▼ 57.1% |
| July | 43 | 16 | ▼ 62.8% |
| August | 40 | – | – |
| September | 39 | – | – |
| October | 51 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 221 | 160 | ▼ 27.6% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 78.6% | 76.9% | ▼ 2.1% |
| February | 58.3% | 71.4% | ▲ 22.5% |
| March | 76.7% | 70.0% | ▼ 8.7% |
| April | 92.6% | 61.5% | ▼ 33.5% |
| May | 76.9% | 50.0% | ▼ 35.0% |
| June | 50.0% | 33.3% | ▼ 33.3% |
| July | 48.8% | 43.8% | ▼ 10.4% |
| August | 85.0% | – | – |
| September | 87.2% | – | – |
| October | 58.8% | – | in progress |
| November | 58.6% | – | – |
| December | 43.3% | – | – |
| Year-to-date average (Jan–Jul) | 68.8% | 58.1% | ▼ 15.6% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 1 | 0.0% |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 3 | ▲ 200.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.2% 649
- Cancelled 0.8% 5
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
99 of 9
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN ONT Denver International Airport – Ontario International Airport | 1,316 | 12.5 min | 69.4% | 73 |
| DEN BUR Denver International Airport – Hollywood Burbank/Bob Hope Airport | 1,366 | 25.7 min | 48.3% | 59 |
| MDW JAX Chicago Midway International Airport – Jacksonville International Airport | 1,368 | 5.3 min | 86.0% | 57 |
| DEN SAT Denver International Airport – San Antonio International Airport | 1,280 | 8.0 min | 85.7% | 49 |
| DAL LGB Dallas Love Field – Long Beach International Airport | 1,979 | 31.8 min | 50.0% | 49 |
| DAL COS Dallas Love Field – City of Colorado Springs Municipal Airport | 969 | 23.8 min | 42.9% | 42 |
| BUR OAK Hollywood Burbank/Bob Hope Airport – Oakland San Francisco Bay Airport | 523 | 13.5 min | 69.4% | 36 |
| PHX TUL Phoenix Sky Harbor International Airport – Tulsa International Airport | 1,501 | 15.0 min | 72.7% | 33 |
| AUS LAS Austin Bergstrom International Airport – Harry Reid International Airport | 1,752 | 5.5 min | 81.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 23 | 23 | 69.6% | 0 |
| November 2024 | 29 | 29 | 86.2% | 0 |
| December 2024 | 31 | 31 | 61.3% | 0 |
| January 2025 | 29 | 28 | 78.6% | 1 |
| February 2025 | 24 | 24 | 58.3% | 0 |
| March 2025 | 30 | 30 | 76.7% | 0 |
| April 2025 | 27 | 27 | 92.6% | 0 |
| May 2025 | 26 | 26 | 76.9% | 0 |
| June 2025 | 42 | 42 | 50.0% | 0 |
| July 2025 | 43 | 43 | 48.8% | 0 |
| August 2025 | 40 | 40 | 85.0% | 0 |
| September 2025 | 39 | 39 | 87.2% | 0 |
| October 2025 | 51 | 51 | 58.8% | 0 |
| November 2025 | 29 | 29 | 58.6% | 0 |
| December 2025 | 31 | 30 | 43.3% | 1 |
| January 2026 | 14 | 13 | 76.9% | 1 |
| February 2026 | 29 | 28 | 71.4% | 1 |
| March 2026 | 30 | 30 | 70.0% | 0 |
| April 2026 | 27 | 26 | 61.5% | 1 |
| May 2026 | 26 | 26 | 50.0% | 0 |
| June 2026 | 18 | 18 | 33.3% | 0 |
| July 2026 | 16 | 16 | 43.8% | 0 |