Flight WN4259

Southwest Airlines flight WN4259

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Looking for WN4259 in the air…

Denver (DEN) to Long Beach (LGB)

Historically, this flight arrives 15+ minutes late 53% of the time, and when it is late the delay averages 42 minutes. It was cancelled 0.0% of the time.

On-time arrivals

46.7%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

42 min

Flights arriving 15+ minutes late

Flights tracked

60

Scheduled flights in the period

What caused the delays

• Airline (crew, maintenance, cleaning) 54%
• Late-arriving aircraft 37%
• Air traffic control & airport 7%
• Extreme weather 1%
• Security 0%

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

Baltimore (BWI) to Orlando (MCO)

Historically, this flight arrives 15+ minutes late 27% of the time, and when it is late the delay averages 57 minutes. It was cancelled 3.9% of the time.

On-time arrivals

73.5%

Less than 15 minutes late

Cancelled

3.9%

Of scheduled flights

Average delay when late

57 min

Flights arriving 15+ minutes late

Flights tracked

51

Scheduled flights in the period

What caused the delays

• Air traffic control & airport 47%
• Airline (crew, maintenance, cleaning) 32%
• Late-arriving aircraft 21%
• Extreme weather 0%
• Security 0%

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

Houston (HOU) to Phoenix (PHX)

Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 52 minutes. It was cancelled 0.0% of the time.

On-time arrivals

87.1%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

52 min

Flights arriving 15+ minutes late

Flights tracked

31

Scheduled flights in the period

What caused the delays

• Airline (crew, maintenance, cleaning) 66%
• Air traffic control & airport 34%
• Late-arriving aircraft 0%
• Extreme weather 0%
• Security 0%

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

Dallas (DAL) to Denver (DEN)

Only 16 flights on record, which is too few for reliable odds.

On-time arrivals

62.5%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

58 min

Flights arriving 15+ minutes late

Flights tracked

16

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 83%
• Extreme weather 11%
• Air traffic control & airport 5%
• Airline (crew, maintenance, cleaning) 2%
• Security 0%

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

Sacramento (SMF) to Baltimore (BWI)

Only 14 flights on record, which is too few for reliable odds.

On-time arrivals

84.6%

Less than 15 minutes late

Cancelled

7.1%

Of scheduled flights

Average delay when late

46 min

Flights arriving 15+ minutes late

Flights tracked

14

Scheduled flights in the period

What caused the delays

• Airline (crew, maintenance, cleaning) 74%
• Air traffic control & airport 14%
• Late-arriving aircraft 12%
• Extreme weather 0%
• Security 0%

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

Memphis (MEM) to Houston (HOU)

Only 8 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

8

Scheduled flights in the period

Albuquerque (ABQ) to Baltimore (BWI)

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

St Louis (STL) to Las Vegas (LAS)

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

118 min

Flights arriving 15+ minutes late

Flights tracked

5

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 93%
• Airline (crew, maintenance, cleaning) 7%
• Air traffic control & airport 0%
• Extreme weather 0%
• Security 0%

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

Austin (AUS) to El Paso (ELP)

Only 2 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

2

Scheduled flights in the period

El Paso (ELP) to Las Vegas (LAS)

Only 2 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

2

Scheduled flights in the period

Boston (BOS) 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

Baltimore (BWI) 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

Las Vegas (LAS) to El Paso (ELP)

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 Ontario (ONT)

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

Milwaukee (MKE) to Orlando (MCO)

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

Sep 2025 Aug 2026

Show as table

Month	On time	Flights
September 2025	86.7%	30
October 2025	100.0%	1
November 2025	73.3%	15
December 2025	81.8%	11
January 2026	82.1%	30
February 2026	75.0%	33
March 2026	55.6%	9
April 2026	100.0%	1
May 2026	100.0%	1
June 2026	40.7%	27
July 2026	50.0%	30
August 2026	90.9%	11

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