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Flight WN543

Southwest Airlines flight WN543

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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

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  • 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

San Jose (SJC) to San Diego (SAN)

Historically, this flight arrives 15+ minutes late 26% of the time, and when it is late the delay averages 36 minutes. It was cancelled 0.0% of the time.

On-time arrivals
74.1%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
36 min
Flights arriving 15+ minutes late
Flights tracked
58
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 56%
  • Late-arriving aircraft 24%
  • Airline (crew, maintenance, cleaning) 20%
  • Extreme weather 0%
  • Security 0%

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

Albany (ALB) to Baltimore (BWI)

Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 143 minutes. It was cancelled 0.0% of the time.

On-time arrivals
90.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
143 min
Flights arriving 15+ minutes late
Flights tracked
50
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 40%
  • Airline (crew, maintenance, cleaning) 34%
  • Security 13%
  • Late-arriving aircraft 13%
  • Extreme weather 0%

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

Austin (AUS) to Denver (DEN)

Historically, this flight arrives 15+ minutes late 45% of the time, and when it is late the delay averages 60 minutes. It was cancelled 0.0% of the time.

On-time arrivals
54.5%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
60 min
Flights arriving 15+ minutes late
Flights tracked
45
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 83%
  • Air traffic control & airport 11%
  • Airline (crew, maintenance, cleaning) 6%
  • Extreme weather 0%
  • Security 0%

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

Chicago (MDW) to Albany (ALB)

Historically, this flight arrives 15+ minutes late 7% of the time, and when it is late the delay averages 58 minutes. It was cancelled 0.0% of the time.

On-time arrivals
92.9%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
58 min
Flights arriving 15+ minutes late
Flights tracked
42
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 74%
  • Airline (crew, maintenance, cleaning) 18%
  • Air traffic control & airport 8%
  • Extreme weather 0%
  • Security 0%

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

Salt Lake City (SLC) to Long Beach (LGB)

Historically, this flight arrives 15+ minutes late 3% of the time, and when it is late the delay averages 117 minutes. It was cancelled 0.0% of the time.

On-time arrivals
97.2%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
117 min
Flights arriving 15+ minutes late
Flights tracked
36
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 100%
  • Airline (crew, maintenance, cleaning) 0%
  • Air traffic control & airport 0%
  • Extreme weather 0%
  • Security 0%

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

Milwaukee (MKE) to Phoenix (PHX)

Historically, this flight arrives 15+ minutes late 38% of the time, and when it is late the delay averages 54 minutes. It was cancelled 3.0% of the time.

On-time arrivals
62.5%
Less than 15 minutes late
Cancelled
3.0%
Of scheduled flights
Average delay when late
54 min
Flights arriving 15+ minutes late
Flights tracked
33
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).

Nashville (BNA) to Las Vegas (LAS)

Historically, this flight arrives 15+ minutes late 43% of the time, and when it is late the delay averages 64 minutes. It was cancelled 0.0% of the time.

On-time arrivals
57.1%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
64 min
Flights arriving 15+ minutes late
Flights tracked
28
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 60%
  • Airline (crew, maintenance, cleaning) 16%
  • Extreme weather 15%
  • Air traffic control & airport 8%
  • Security 0%

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

Orlando (MCO) to Atlanta (ATL)

Historically, this flight arrives 15+ minutes late 12% of the time, and when it is late the delay averages 64 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
64 min
Flights arriving 15+ minutes late
Flights tracked
26
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 53%
  • Air traffic control & airport 34%
  • Late-arriving aircraft 14%
  • Extreme weather 0%
  • Security 0%

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

Phoenix (PHX) to Long Beach (LGB)

Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 151 minutes. It was cancelled 0.0% of the time.

On-time arrivals
90.5%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
151 min
Flights arriving 15+ minutes late
Flights tracked
21
Scheduled flights in the period

What caused the delays

  • Extreme weather 71%
  • Air traffic control & airport 20%
  • Airline (crew, maintenance, cleaning) 10%
  • Late-arriving aircraft 0%
  • Security 0%

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

Denver (DEN) to Memphis (MEM)

Only 18 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
50 min
Flights arriving 15+ minutes late
Flights tracked
18
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 70%
  • Airline (crew, maintenance, cleaning) 28%
  • Air traffic control & airport 2%
  • Extreme weather 0%
  • Security 0%

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

Seattle (SEA) to Oakland (OAK)

Only 16 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
16
Scheduled flights in the period

Long Beach (LGB) to Austin (AUS)

Only 13 flights on record, which is too few for reliable odds.

On-time arrivals
92.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
248 min
Flights arriving 15+ minutes late
Flights tracked
13
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 100%
  • Airline (crew, maintenance, cleaning) 0%
  • Air traffic control & airport 0%
  • Extreme weather 0%
  • Security 0%

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

Las Vegas (LAS) to Oakland (OAK)

Only 12 flights on record, which is too few for reliable odds.

On-time arrivals
25.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
52 min
Flights arriving 15+ minutes late
Flights tracked
12
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 49%
  • Air traffic control & airport 33%
  • Airline (crew, maintenance, cleaning) 18%
  • Extreme weather 0%
  • Security 0%

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

Oakland (OAK) to Albuquerque (ABQ)

Only 9 flights on record, which is too few for reliable odds.

On-time arrivals
22.2%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
36 min
Flights arriving 15+ minutes late
Flights tracked
9
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 52%
  • Late-arriving aircraft 47%
  • Air traffic control & airport 1%
  • Extreme weather 0%
  • Security 0%

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

Long Beach (LGB) to Chicago (MDW)

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

Long Beach (LGB) to Oakland (OAK)

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

Austin (AUS) to Charleston (CHS)

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

Charleston (CHS) to Baltimore (BWI)

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

Denver (DEN) to Salt Lake City (SLC)

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
69 min
Flights arriving 15+ minutes late
Flights tracked
1
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 84%
  • Late-arriving aircraft 16%
  • Air traffic control & airport 0%
  • Extreme weather 0%
  • Security 0%

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

Detroit (DTW) to Chicago (MDW)

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

Long Beach (LGB) to San Jose (SJC)

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
51 min
Flights arriving 15+ minutes late
Flights tracked
1
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 100%
  • Airline (crew, maintenance, cleaning) 0%
  • Air traffic control & airport 0%
  • Extreme weather 0%
  • Security 0%

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

Orlando (MCO) to San Juan (SJU)

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

Raleigh/Durham (RDU) to Houston (HOU)

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

In the news

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On-time arrivals by month
Sep 2025 Aug 2026
Show as table
MonthOn timeFlights
September 2025 92.9% 42
October 2025 88.5% 26
November 2025 62.1% 30
December 2025 51.6% 31
January 2026 71.0% 31
February 2026 67.9% 28
March 2026 60.0% 31
April 2026 93.3% 45
May 2026 89.8% 49
June 2026 87.9% 33
July 2026 84.8% 33
August 2026 48.8% 43

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

Latest airport & airline headlines

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Headlines found by Google News; stories open on the publisher's site.