WN3940
WN3940 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Pittsburgh to Chicago. Of 421 departures recorded from October 2024 to July 2026, 76.0% left on time, according to the US BTS.
- On-time departures76.0%of 421 flights
- Average delay13.9 min
- July 202648▲ 128.6%vs July 2025
- Cancelled0.0%
- Legs flown under this number19
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 6 | – |
| February | 2 | 18 | ▲ 800.0% |
| March | 21 | 33 | ▲ 57.1% |
| April | 20 | 31 | ▲ 55.0% |
| May | 23 | 31 | ▲ 34.8% |
| June | 22 | 46 | ▲ 109.1% |
| July | 21 | 48 | ▲ 128.6% |
| August | 26 | – | – |
| September | 26 | – | – |
| October | 23 | – | in progress |
| November | 4 | – | – |
| December | 2 | – | – |
according to the US BTS · October 2024 → July 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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 66.7% | – |
| February | 100.0% | 44.4% | ▼ 55.6% |
| March | 61.9% | 78.8% | ▲ 27.3% |
| April | 55.0% | 90.3% | ▲ 64.2% |
| May | 73.9% | 93.6% | ▲ 26.6% |
| June | 86.4% | 58.7% | ▼ 32.0% |
| July | 85.7% | 75.0% | ▼ 12.5% |
| August | 73.1% | – | – |
| September | 76.9% | – | – |
| October | 91.3% | – | in progress |
| November | 100.0% | – | – |
| December | 50.0% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
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 100.0% 421
- Cancelled 0.0% 0
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 |
|---|---|---|---|---|
| PIT MDW Pittsburgh International Airport – Chicago Midway International Airport | 646 | 1.2 min | 91.4% | 58 |
| ONT BWI Ontario International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,666 | 13.0 min | 78.0% | 50 |
| LBB DAL Lubbock Preston Smith International Airport – Dallas Love Field | 472 | 17.5 min | 76.0% | 50 |
| OGG SJC Kahului International Airport – Mineta San Jose International Airport | 3,788 | 6.9 min | 84.1% | 44 |
| MDW GRR Chicago Midway International Airport – Gerald R. Ford International Airport | 220 | 13.4 min | 81.8% | 33 |
| DAL SAT Dallas Love Field – San Antonio International Airport | 399 | 24.8 min | 54.6% | 33 |
| PDX OAK Portland International Airport – Oakland San Francisco Bay Airport | 876 | 20.1 min | 62.5% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 93.8% | 0 |
| November 2024 | 1 | 1 | 100.0% | 0 |
| December 2024 | 1 | 1 | 100.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 21 | 21 | 61.9% | 0 |
| April 2025 | 20 | 20 | 55.0% | 0 |
| May 2025 | 23 | 23 | 73.9% | 0 |
| June 2025 | 22 | 22 | 86.4% | 0 |
| July 2025 | 21 | 21 | 85.7% | 0 |
| August 2025 | 26 | 26 | 73.1% | 0 |
| September 2025 | 26 | 26 | 76.9% | 0 |
| October 2025 | 23 | 23 | 91.3% | 0 |
| November 2025 | 4 | 4 | 100.0% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 6 | 6 | 66.7% | 0 |
| February 2026 | 18 | 18 | 44.4% | 0 |
| March 2026 | 33 | 33 | 78.8% | 0 |
| April 2026 | 31 | 31 | 90.3% | 0 |
| May 2026 | 31 | 31 | 93.6% | 0 |
| June 2026 | 46 | 46 | 58.7% | 0 |
| July 2026 | 48 | 48 | 75.0% | 0 |