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Flight WN4009

Southwest Airlines flight WN4009

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Looking for WN4009 in the air…

Alerts at this flight's airports

  • 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

    Read the story →

  • Advisory Coastal Flood Advisory CLD, SAN, SNA

    COASTAL FLOOD ADVISORY IN EFFECT FROM 4 AM FRIDAY TO NOON PST TUESDAY

    Weather

  • Advisory Coastal Flood Advisory OAK, SFO, SQL, STS

    COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1 PM PST MONDAY

    Weather

Tampa (TPA) to Baltimore (BWI)

Historically, this flight arrives 15+ minutes late 12% of the time, and when it is late the delay averages 54 minutes. It was cancelled 0.0% of the time.

On-time arrivals
88.4%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
54 min
Flights arriving 15+ minutes late
Flights tracked
43
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 61%
  • Late-arriving aircraft 19%
  • Air traffic control & airport 19%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

PBI → ISP

Historically, this flight arrives 15+ minutes late 24% of the time, and when it is late the delay averages 43 minutes. It was cancelled 2.6% of the time.

On-time arrivals
76.3%
Less than 15 minutes late
Cancelled
2.6%
Of scheduled flights
Average delay when late
43 min
Flights arriving 15+ minutes late
Flights tracked
39
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 63%
  • Airline (crew, maintenance, cleaning) 31%
  • Air traffic control & airport 6%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Denver (DEN) to Anchorage (ANC)

Historically, this flight arrives 15+ minutes late 68% of the time, and when it is late the delay averages 80 minutes. It was cancelled 0.0% of the time.

On-time arrivals
32.1%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
80 min
Flights arriving 15+ minutes late
Flights tracked
28
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 63%
  • Airline (crew, maintenance, cleaning) 26%
  • Air traffic control & airport 10%
  • Extreme weather 2%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Colorado Springs (COS) to Phoenix (PHX)

Historically, this flight arrives 15+ minutes late 12% of the time, and when it is late the delay averages 77 minutes. It was cancelled 0.0% of the time.

On-time arrivals
88.5%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
77 min
Flights arriving 15+ minutes late
Flights tracked
26
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 82%
  • Late-arriving aircraft 16%
  • Airline (crew, maintenance, cleaning) 2%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

San Diego (SAN) to Oakland (OAK)

Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 59 minutes. It was cancelled 0.0% of the time.

On-time arrivals
96.2%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
59 min
Flights arriving 15+ minutes late
Flights tracked
26
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).

New Orleans (MSY) to Baltimore (BWI)

Historically, this flight arrives 15+ minutes late 52% of the time, and when it is late the delay averages 33 minutes. It was cancelled 0.0% of the time.

On-time arrivals
47.8%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
33 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 50%
  • Late-arriving aircraft 41%
  • Extreme weather 8%
  • Air traffic control & airport 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Phoenix (PHX) to San Diego (SAN)

Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 78 minutes. It was cancelled 0.0% of the time.

On-time arrivals
87.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
78 min
Flights arriving 15+ minutes late
Flights tracked
23
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 77%
  • Airline (crew, maintenance, cleaning) 20%
  • Air traffic control & airport 3%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Chicago (MDW) to St Louis (STL)

Only 15 flights on record, which is too few for reliable odds.

On-time arrivals
64.3%
Less than 15 minutes late
Cancelled
6.7%
Of scheduled flights
Average delay when late
123 min
Flights arriving 15+ minutes late
Flights tracked
15
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 74%
  • Airline (crew, maintenance, cleaning) 25%
  • Air traffic control & airport 1%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Phoenix (PHX) to Tampa (TPA)

Only 8 flights on record, which is too few for reliable odds.

On-time arrivals
50.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
37 min
Flights arriving 15+ minutes late
Flights tracked
8
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 62%
  • Air traffic control & airport 25%
  • Airline (crew, maintenance, cleaning) 13%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Las Vegas (LAS) to Milwaukee (MKE)

Only 7 flights on record, which is too few for reliable odds.

On-time arrivals
57.1%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
40 min
Flights arriving 15+ minutes late
Flights tracked
7
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 96%
  • Late-arriving aircraft 2%
  • Air traffic control & airport 2%
  • Extreme weather 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Islip (ISP) to Baltimore (BWI)

Only 5 flights on record, which is too few for reliable odds.

On-time arrivals
60.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
32 min
Flights arriving 15+ minutes late
Flights tracked
5
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 75%
  • Airline (crew, maintenance, cleaning) 16%
  • Extreme weather 9%
  • Air traffic control & airport 0%
  • Security 0%

Share of delay minutes airlines attributed to each cause (BTS).

Portland (PDX) to Phoenix (PHX)

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

Oakland (OAK) to Las Vegas (LAS)

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

Houston (HOU) 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

Las Vegas (LAS) to Sacramento (SMF)

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

Kansas City (MCI) to Phoenix (PHX)

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

Minneapolis (MSP) to Phoenix (PHX)

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
On-time arrivals by month
Oct 2025 Aug 2026
Show as table
MonthOn timeFlights
October 2025 92.3% 52
November 2025 90.9% 23
December 2025 57.9% 19
January 2026 80.0% 5
February 2026 100.0% 3
March 2026 66.7% 12
April 2026 78.6% 30
May 2026 54.3% 35
June 2026 90.9% 22
July 2026 84.6% 26
August 2026 36.7% 30

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

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