WN343
WN343 (Southwest Airlines) is a multi-stop service on 39 routes, busiest Denver to Sacramento. Of 644 departures recorded from October 2024 to July 2026, 74.7% left on time, according to the US BTS.
- On-time departures74.7%of 644 flights
- Average delay13.4 min
- July 202634▲ 88.9%vs July 2025
- Cancelled0.8%
- Legs flown under this number39
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 | 36 | 22 | ▼ 38.9% |
| February | 37 | 33 | ▼ 10.8% |
| March | 39 | 28 | ▼ 28.2% |
| April | 23 | 34 | ▲ 47.8% |
| May | 22 | 41 | ▲ 86.4% |
| June | 16 | 33 | ▲ 106.3% |
| July | 18 | 34 | ▲ 88.9% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 27 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 191 | 225 | ▲ 17.8% |
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 | 77.8% | 95.5% | ▲ 22.7% |
| February | 54.1% | 72.7% | ▲ 34.6% |
| March | 82.1% | 78.3% | ▼ 4.6% |
| April | 73.9% | 55.9% | ▼ 24.4% |
| May | 77.3% | 65.9% | ▼ 14.8% |
| June | 75.0% | 75.8% | ▲ 1.0% |
| July | 72.2% | 73.5% | ▲ 1.8% |
| August | 83.9% | – | – |
| September | 83.3% | – | – |
| October | 93.6% | – | in progress |
| November | 77.8% | – | – |
| December | 55.2% | – | – |
| Year-to-date average (Jan–Jul) | 73.2% | 73.9% | ▲ 1.0% |
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 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 5 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 5 |
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 99.2% 639
- Cancelled 0.8% 5
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN SMF Denver International Airport – Sacramento International Airport | 1,460 | 13.4 min | 69.2% | 94 |
| ATL DAL Hartsfield Jackson Atlanta International Airport – Dallas Love Field | 1,158 | 8.8 min | 82.5% | 57 |
| SMF SEA Sacramento International Airport – Seattle–Tacoma International Airport | 975 | 5.9 min | 82.9% | 41 |
| ABQ AUS Albuquerque International Sunport – Austin Bergstrom International Airport | 995 | 5.3 min | 82.1% | 39 |
| RNO LAS Reno Tahoe International Airport – Harry Reid International Airport | 556 | 3.8 min | 83.3% | 36 |
| PHX MCI Phoenix Sky Harbor International Airport – Kansas City International Airport | 1,677 | 25.1 min | 50.0% | 32 |
| LGB PHX Long Beach International Airport – Phoenix Sky Harbor International Airport | 570 | 16.9 min | 65.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 29 | 29 | 82.8% | 0 |
| December 2024 | 31 | 31 | 64.5% | 0 |
| January 2025 | 36 | 36 | 77.8% | 0 |
| February 2025 | 37 | 37 | 54.1% | 0 |
| March 2025 | 39 | 39 | 82.1% | 0 |
| April 2025 | 23 | 23 | 73.9% | 0 |
| May 2025 | 22 | 22 | 77.3% | 0 |
| June 2025 | 16 | 16 | 75.0% | 0 |
| July 2025 | 18 | 18 | 72.2% | 0 |
| August 2025 | 31 | 31 | 83.9% | 0 |
| September 2025 | 30 | 30 | 83.3% | 0 |
| October 2025 | 31 | 31 | 93.6% | 0 |
| November 2025 | 27 | 27 | 77.8% | 0 |
| December 2025 | 29 | 29 | 55.2% | 0 |
| January 2026 | 22 | 22 | 95.5% | 0 |
| February 2026 | 33 | 33 | 72.7% | 0 |
| March 2026 | 28 | 23 | 78.3% | 5 |
| April 2026 | 34 | 34 | 55.9% | 0 |
| May 2026 | 41 | 41 | 65.9% | 0 |
| June 2026 | 33 | 33 | 75.8% | 0 |
| July 2026 | 34 | 34 | 73.5% | 0 |