WN3437
WN3437 (Southwest Airlines) is a multi-stop service on 23 routes, busiest Denver to Des Moines. Of 491 departures recorded from October 2024 to June 2026, 76.1% left on time, according to the US BTS.
- On-time departures76.1%of 491 flights
- Average delay15.2 min
- June 20263▼ 90.0%vs June 2025
- Cancelled1.0%
- Legs flown under this number23
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 | 24 | 2 | ▼ 91.7% |
| February | 20 | – | – |
| March | 41 | 23 | ▼ 43.9% |
| April | 34 | 30 | ▼ 11.8% |
| May | 31 | 30 | ▼ 3.2% |
| June | 30 | 3 | ▼ 90.0% |
| July | 31 | – | – |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 30 | – | in progress |
| November | 16 | – | – |
| December | 18 | – | – |
according to the US BTS · October 2024 → June 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 | 79.2% | 0.0% | ▼ 100.0% |
| February | 85.0% | – | – |
| March | 100.0% | 95.5% | ▼ 4.5% |
| April | 61.8% | 100.0% | ▲ 61.9% |
| May | 60.0% | 86.7% | ▲ 44.5% |
| June | 56.7% | 100.0% | ▲ 76.5% |
| July | 51.7% | – | – |
| August | 80.7% | – | – |
| September | 83.3% | – | – |
| October | 73.3% | – | in progress |
| November | 81.3% | – | – |
| December | 66.7% | – | – |
according to the US BTS · October 2024 → June 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → June 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 | 1 | 1 | 0.0% |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 2 | – | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
according to the US BTS · October 2024 → June 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 99.0% 486
- Cancelled 1.0% 5
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jun 3, 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 DSM Denver International Airport – Des Moines International Airport | 947 | 11.8 min | 69.7% | 67 |
| STL BWI St. Louis Lambert International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,185 | 43.3 min | 52.5% | 61 |
| STL MIA St. Louis Lambert International Airport – Miami International Airport | 1,722 | 7.6 min | 84.5% | 58 |
| MKE BWI General Mitchell International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,030 | -1.5 min | 91.8% | 49 |
| CMH DAL John Glenn Columbus International Airport – Dallas Love Field | 1,478 | 36.5 min | 53.9% | 40 |
| BNA MDW Nashville International Airport – Chicago Midway International Airport | 636 | 5.6 min | 93.9% | 33 |
| MSY MDW Louis Armstrong New Orleans International Airport – Chicago Midway International Airport | 1,331 | 17.6 min | 73.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 88.2% | 0 |
| November 2024 | 32 | 32 | 71.9% | 0 |
| December 2024 | 18 | 18 | 44.4% | 0 |
| January 2025 | 24 | 24 | 79.2% | 0 |
| February 2025 | 20 | 20 | 85.0% | 0 |
| March 2025 | 41 | 40 | 100.0% | 1 |
| April 2025 | 34 | 34 | 61.8% | 0 |
| May 2025 | 31 | 30 | 60.0% | 1 |
| June 2025 | 30 | 30 | 56.7% | 0 |
| July 2025 | 31 | 29 | 51.7% | 2 |
| August 2025 | 31 | 31 | 80.7% | 0 |
| September 2025 | 30 | 30 | 83.3% | 0 |
| October 2025 | 30 | 30 | 73.3% | 0 |
| November 2025 | 16 | 16 | 81.3% | 0 |
| December 2025 | 18 | 18 | 66.7% | 0 |
| January 2026 | 2 | 2 | 0.0% | 0 |
| March 2026 | 23 | 22 | 95.5% | 1 |
| April 2026 | 30 | 30 | 100.0% | 0 |
| May 2026 | 30 | 30 | 86.7% | 0 |
| June 2026 | 3 | 3 | 100.0% | 0 |