Flight WN3151
Southwest Airlines flight WN3151
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Alerts at this flight's airports
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Watch Ground Delay Program SAN
Ground Delay Program at San Diego International Airport (SAN): Average 37 minutes, up to 1 hour and 11 minutes
Reason: airport volume
Airport status
San Jose (SJC) to Ontario (ONT)
Historically, this flight arrives 15+ minutes late 14% of the time, and when it is late the delay averages 67 minutes. It was cancelled 1.7% of the time.
- On-time arrivals
- 86.4%
- Less than 15 minutes late
- Cancelled
- 1.7%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 60
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 86%
- Airline (crew, maintenance, cleaning) 13%
- Air traffic control & airport 2%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Phoenix (PHX) to Houston (HOU)
Historically, this flight arrives 15+ minutes late 5% of the time, and when it is late the delay averages 45 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 94.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 45 min
- Flights arriving 15+ minutes late
- Flights tracked
- 58
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 56%
- Air traffic control & airport 44%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (MDW) to Houston (HOU)
Historically, this flight arrives 15+ minutes late 38% of the time, and when it is late the delay averages 58 minutes. It was cancelled 2.0% of the time.
- On-time arrivals
- 62.5%
- Less than 15 minutes late
- Cancelled
- 2.0%
- Of scheduled flights
- Average delay when late
- 58 min
- Flights arriving 15+ minutes late
- Flights tracked
- 49
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 71%
- Air traffic control & airport 18%
- Late-arriving aircraft 11%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Indianapolis (IND) to Baltimore (BWI)
Historically, this flight arrives 15+ minutes late 16% of the time, and when it is late the delay averages 60 minutes. It was cancelled 2.2% of the time.
- On-time arrivals
- 84.4%
- Less than 15 minutes late
- Cancelled
- 2.2%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 46
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 88%
- Air traffic control & airport 10%
- Airline (crew, maintenance, cleaning) 2%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Washington (DCA) to St Louis (STL)
Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 81 minutes. It was cancelled 3.0% of the time.
- On-time arrivals
- 81.2%
- Less than 15 minutes late
- Cancelled
- 3.0%
- Of scheduled flights
- Average delay when late
- 81 min
- Flights arriving 15+ minutes late
- Flights tracked
- 33
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 88%
- Air traffic control & airport 12%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Los Angeles (LAX) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 35% of the time, and when it is late the delay averages 57 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 64.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 57 min
- Flights arriving 15+ minutes late
- Flights tracked
- 31
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 56%
- Late-arriving aircraft 34%
- Airline (crew, maintenance, cleaning) 10%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Ontario (ONT) to Las Vegas (LAS)
Historically, this flight arrives 15+ minutes late 42% of the time, and when it is late the delay averages 37 minutes. It was cancelled 3.7% of the time.
- On-time arrivals
- 57.7%
- Less than 15 minutes late
- Cancelled
- 3.7%
- Of scheduled flights
- Average delay when late
- 37 min
- Flights arriving 15+ minutes late
- Flights tracked
- 27
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 49%
- Air traffic control & airport 26%
- Airline (crew, maintenance, cleaning) 25%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Nashville (BNA) to Indianapolis (IND)
Historically, this flight arrives 15+ minutes late 29% of the time, and when it is late the delay averages 61 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 70.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 61 min
- Flights arriving 15+ minutes late
- Flights tracked
- 24
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 81%
- Airline (crew, maintenance, cleaning) 14%
- Air traffic control & airport 6%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Philadelphia (PHL) to Chicago (MDW)
Historically, this flight arrives 15+ minutes late 30% of the time, and when it is late the delay averages 78 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 70.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 78 min
- Flights arriving 15+ minutes late
- Flights tracked
- 20
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 35%
- Extreme weather 29%
- Air traffic control & airport 21%
- Airline (crew, maintenance, cleaning) 15%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Antonio (SAT) to Dallas (DAL)
Only 18 flights on record, which is too few for reliable odds.
- On-time arrivals
- 77.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 86 min
- Flights arriving 15+ minutes late
- Flights tracked
- 18
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 52%
- Extreme weather 30%
- Air traffic control & airport 13%
- Airline (crew, maintenance, cleaning) 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Portland (PDX) to San Jose (SJC)
Only 9 flights on record, which is too few for reliable odds.
- On-time arrivals
- 88.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 285 min
- Flights arriving 15+ minutes late
- Flights tracked
- 9
- 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).
Kansas City (MCI) to Indianapolis (IND)
Only 8 flights on record, which is too few for reliable odds.
- On-time arrivals
- 87.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 8
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 88%
- Late-arriving aircraft 12%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Diego (SAN) to Kansas City (MCI)
Only 8 flights on record, which is too few for reliable odds.
- On-time arrivals
- 87.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 49 min
- Flights arriving 15+ minutes late
- Flights tracked
- 8
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 88%
- Air traffic control & airport 12%
- Airline (crew, maintenance, cleaning) 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Fort Myers (RSW) to Denver (DEN)
Only 5 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
- 5
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 63.3% | 30 |
| October 2025 | 77.8% | 18 |
| November 2025 | 82.9% | 36 |
| December 2025 | 77.8% | 36 |
| January 2026 | 96.7% | 30 |
| February 2026 | 92.9% | 28 |
| March 2026 | 83.3% | 31 |
| April 2026 | 76.9% | 27 |
| May 2026 | 48.0% | 25 |
| June 2026 | 80.4% | 46 |
| July 2026 | 80.4% | 48 |
| August 2026 | 75.6% | 41 |
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