WN3520
WN3520 (Southwest Airlines) is a multi-stop service on 38 routes, busiest Sacramento to Ontario. Of 531 departures recorded from October 2024 to July 2026, 73.0% left on time, according to the US BTS.
- On-time departures73.0%of 531 flights
- Average delay13.7 min
- July 20269▼ 77.5%vs July 2025
- Cancelled0.9%
- Legs flown under this number38
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 | 6 | 6 | 0.0% |
| February | 2 | 3 | ▲ 50.0% |
| March | 22 | 79 | ▲ 259.1% |
| April | 29 | 42 | ▲ 44.8% |
| May | 31 | 31 | 0.0% |
| June | 36 | 15 | ▼ 58.3% |
| July | 40 | 9 | ▼ 77.5% |
| August | 8 | – | – |
| September | 4 | – | – |
| October | 21 | – | in progress |
| November | 50 | – | – |
| December | 41 | – | – |
| Year to date (Jan–Jul) | 166 | 185 | ▲ 11.4% |
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% | 80.0% | ▼ 4.0% |
| February | 100.0% | 100.0% | 0.0% |
| March | 63.6% | 59.0% | ▼ 7.3% |
| April | 75.9% | 83.3% | ▲ 9.8% |
| May | 61.3% | 90.3% | ▲ 47.4% |
| June | 55.6% | 86.7% | ▲ 56.0% |
| July | 87.5% | 100.0% | ▲ 14.3% |
| August | 37.5% | – | – |
| September | 75.0% | – | – |
| October | 71.4% | – | in progress |
| November | 83.0% | – | – |
| December | 58.5% | – | – |
| Year-to-date average (Jan–Jul) | 75.3% | 85.6% | ▲ 13.7% |
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 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 2 |
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 99.1% 526
- Cancelled 0.9% 5
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SMF ONT Sacramento International Airport – Ontario International Airport | 627 | 12.6 min | 70.0% | 60 |
| PHX SFO Phoenix Sky Harbor International Airport – San Francisco International Airport | 1,047 | 18.7 min | 69.0% | 58 |
| MTJ DEN Montrose Regional Airport – Denver International Airport | 316 | -1.1 min | 93.1% | 58 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 22 | 22 | 68.2% | 0 |
| November 2024 | 12 | 12 | 91.7% | 0 |
| December 2024 | 22 | 22 | 86.4% | 0 |
| January 2025 | 6 | 6 | 83.3% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 22 | 22 | 63.6% | 0 |
| April 2025 | 29 | 29 | 75.9% | 0 |
| May 2025 | 31 | 31 | 61.3% | 0 |
| June 2025 | 36 | 36 | 55.6% | 0 |
| July 2025 | 40 | 40 | 87.5% | 0 |
| August 2025 | 8 | 8 | 37.5% | 0 |
| September 2025 | 4 | 4 | 75.0% | 0 |
| October 2025 | 21 | 21 | 71.4% | 0 |
| November 2025 | 50 | 47 | 83.0% | 3 |
| December 2025 | 41 | 41 | 58.5% | 0 |
| January 2026 | 6 | 5 | 80.0% | 1 |
| February 2026 | 3 | 3 | 100.0% | 0 |
| March 2026 | 79 | 78 | 59.0% | 1 |
| April 2026 | 42 | 42 | 83.3% | 0 |
| May 2026 | 31 | 31 | 90.3% | 0 |
| June 2026 | 15 | 15 | 86.7% | 0 |
| July 2026 | 9 | 9 | 100.0% | 0 |