Flight WN4312
Southwest Airlines flight WN4312
Looking for WN4312 in the air…
St Louis (STL) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 29% of the time, and when it is late the delay averages 51 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 71.2%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 51 min
- Flights arriving 15+ minutes late
- Flights tracked
- 52
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 38%
- Airline (crew, maintenance, cleaning) 23%
- Air traffic control & airport 22%
- Extreme weather 17%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Salt Lake City (SLC) to Sacramento (SMF)
Historically, this flight arrives 15+ minutes late 29% of the time, and when it is late the delay averages 54 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 71.4%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 49
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 84%
- Airline (crew, maintenance, cleaning) 16%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Raleigh/Durham (RDU) to St Louis (STL)
Historically, this flight arrives 15+ minutes late 6% of the time, and when it is late the delay averages 83 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 93.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 83 min
- Flights arriving 15+ minutes late
- Flights tracked
- 33
- Scheduled flights in the period
What caused the delays
- Security 70%
- Air traffic control & airport 30%
- Airline (crew, maintenance, cleaning) 0%
- Late-arriving aircraft 0%
- Extreme weather 0%
Share of delay minutes airlines attributed to each cause (BTS).
Tampa (TPA) to Houston (HOU)
Historically, this flight arrives 15+ minutes late 38% of the time, and when it is late the delay averages 64 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 61.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 60%
- Airline (crew, maintenance, cleaning) 22%
- Air traffic control & airport 18%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Pittsburgh (PIT) to St Louis (STL)
Only 19 flights on record, which is too few for reliable odds.
- On-time arrivals
- 94.7%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 34 min
- Flights arriving 15+ minutes late
- Flights tracked
- 19
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 71%
- Late-arriving aircraft 29%
- Airline (crew, maintenance, cleaning) 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Washington (DCA) to Dallas (DAL)
Only 18 flights on record, which is too few for reliable odds.
- On-time arrivals
- 72.2%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 73 min
- Flights arriving 15+ minutes late
- Flights tracked
- 18
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 74%
- Airline (crew, maintenance, cleaning) 24%
- Air traffic control & airport 2%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
New York (LGA) to Chicago (MDW)
Only 16 flights on record, which is too few for reliable odds.
- On-time arrivals
- 60.0%
- Less than 15 minutes late
- Cancelled
- 6.2%
- Of scheduled flights
- Average delay when late
- 87 min
- Flights arriving 15+ minutes late
- Flights tracked
- 16
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 73%
- Air traffic control & airport 22%
- Airline (crew, maintenance, cleaning) 6%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Omaha (OMA) to Las Vegas (LAS)
Only 11 flights on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- —
- Flights arriving 15+ minutes late
- Flights tracked
- 11
- Scheduled flights in the period
Las Vegas (LAS) to Birmingham (BHM)
Only 4 flights on record, which is too few for reliable odds.
- On-time arrivals
- 75.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 71 min
- Flights arriving 15+ minutes late
- Flights tracked
- 4
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 100%
- Late-arriving aircraft 0%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Rochester (ROC) to Tampa (TPA)
Only 4 flights on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- —
- Flights arriving 15+ minutes late
- Flights tracked
- 4
- Scheduled flights in the period
Phoenix (PHX) to New Orleans (MSY)
Only 1 flight on record, which is too few for reliable odds.
- On-time arrivals
- 100.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- —
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- Scheduled flights in the period
St Louis (STL) to Phoenix (PHX)
Only 1 flight on record, which is too few for reliable odds.
- On-time arrivals
- 0.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 24 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 100%
- Late-arriving aircraft 0%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 68.0% | 25 |
| November 2025 | 73.9% | 24 |
| December 2025 | 73.1% | 26 |
| January 2026 | 100.0% | 4 |
| February 2026 | 100.0% | 11 |
| March 2026 | 96.4% | 28 |
| April 2026 | 74.1% | 27 |
| May 2026 | 72.0% | 25 |
| June 2026 | 61.5% | 26 |
| July 2026 | 81.5% | 27 |
| August 2026 | 66.7% | 6 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data