WN4150
WN4150 (Southwest Airlines) is a multi-stop service on 33 routes, busiest Portland to Chicago. Of 436 departures recorded from October 2024 to July 2026, 70.9% left on time, according to the US BTS.
- On-time departures70.9%of 436 flights
- Average delay16.7 min
- July 202617▼ 22.7%vs July 2025
- Cancelled1.4%
- Legs flown under this number33
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 | 18 | 8 | ▼ 55.6% |
| February | 18 | 5 | ▼ 72.2% |
| March | 3 | 27 | ▲ 800.0% |
| April | 8 | 19 | ▲ 137.5% |
| May | 9 | 17 | ▲ 88.9% |
| June | 20 | 16 | ▼ 20.0% |
| July | 22 | 17 | ▼ 22.7% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 75 | – | in progress |
| November | 24 | – | – |
| December | 13 | – | – |
| Year to date (Jan–Jul) | 98 | 109 | ▲ 11.2% |
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 | 83.3% | 57.1% | ▼ 31.4% |
| February | 94.4% | 80.0% | ▼ 15.3% |
| March | 66.7% | 88.0% | ▲ 32.0% |
| April | 87.5% | 61.1% | ▼ 30.2% |
| May | 66.7% | 70.6% | ▲ 5.9% |
| June | 85.0% | 56.3% | ▼ 33.8% |
| July | 77.3% | 52.9% | ▼ 31.5% |
| August | 82.8% | – | – |
| September | 90.0% | – | – |
| October | 43.8% | – | in progress |
| November | 66.7% | – | – |
| December | 76.9% | – | – |
| Year-to-date average (Jan–Jul) | 80.1% | 66.6% | ▼ 16.9% |
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 | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 2 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
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 98.6% 430
- Cancelled 1.4% 6
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| PWM MDW Portland International Jetport – Chicago Midway International Airport | 1,437 | 5.6 min | 86.2% | 58 |
| BUR LAS Hollywood Burbank/Bob Hope Airport – Harry Reid International Airport | 359 | -1.7 min | 95.5% | 44 |
| ONT SMF Ontario International Airport – Sacramento International Airport | 627 | 10.6 min | 81.0% | 42 |
| ORD MCO Chicago O'Hare International Airport – Orlando International Airport | 1,620 | 13.7 min | 86.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 93.8% | 0 |
| November 2024 | 16 | 16 | 68.8% | 0 |
| December 2024 | 26 | 26 | 69.2% | 0 |
| January 2025 | 18 | 18 | 83.3% | 0 |
| February 2025 | 18 | 18 | 94.4% | 0 |
| March 2025 | 3 | 3 | 66.7% | 0 |
| April 2025 | 8 | 8 | 87.5% | 0 |
| May 2025 | 9 | 9 | 66.7% | 0 |
| June 2025 | 20 | 20 | 85.0% | 0 |
| July 2025 | 22 | 22 | 77.3% | 0 |
| August 2025 | 29 | 29 | 82.8% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 75 | 73 | 43.8% | 2 |
| November 2025 | 24 | 24 | 66.7% | 0 |
| December 2025 | 13 | 13 | 76.9% | 0 |
| January 2026 | 8 | 7 | 57.1% | 1 |
| February 2026 | 5 | 5 | 80.0% | 0 |
| March 2026 | 27 | 25 | 88.0% | 2 |
| April 2026 | 19 | 18 | 61.1% | 1 |
| May 2026 | 17 | 17 | 70.6% | 0 |
| June 2026 | 16 | 16 | 56.3% | 0 |
| July 2026 | 17 | 17 | 52.9% | 0 |