Flight WN4256

Southwest Airlines flight WN4256

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Looking for WN4256 in the air…

Colorado Springs (COS) to Phoenix (PHX)

Historically, this flight arrives 15+ minutes late 5% of the time, and when it is late the delay averages 79 minutes. It was cancelled 0.0% of the time.

On-time arrivals

95.0%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

79 min

Flights arriving 15+ minutes late

Flights tracked

60

Scheduled flights in the period

What caused the delays

• Airline (crew, maintenance, cleaning) 96%
• Air traffic control & airport 4%
• Late-arriving aircraft 0%
• Extreme weather 0%
• Security 0%

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

Minneapolis (MSP) to Denver (DEN)

Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 55 minutes. It was cancelled 0.0% of the time.

On-time arrivals

81.2%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

55 min

Flights arriving 15+ minutes late

Flights tracked

49

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 55%
• Air traffic control & airport 26%
• Airline (crew, maintenance, cleaning) 14%
• Extreme weather 6%
• Security 0%

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

St Louis (STL) to Phoenix (PHX)

Historically, this flight arrives 15+ minutes late 23% of the time, and when it is late the delay averages 53 minutes. It was cancelled 0.0% of the time.

On-time arrivals

77.3%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

53 min

Flights arriving 15+ minutes late

Flights tracked

22

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 50%
• Air traffic control & airport 27%
• Airline (crew, maintenance, cleaning) 24%
• Extreme weather 0%
• Security 0%

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

Dallas (DAL) to Baltimore (BWI)

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

Charleston (CHS) to Dallas (DAL)

Only 13 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

13

Scheduled flights in the period

San Antonio (SAT) to Denver (DEN)

Only 11 flights on record, which is too few for reliable odds.

On-time arrivals

72.7%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

52 min

Flights arriving 15+ minutes late

Flights tracked

11

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 64%
• Airline (crew, maintenance, cleaning) 34%
• Air traffic control & airport 3%
• Extreme weather 0%
• Security 0%

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

Kansas City (MCI) to Austin (AUS)

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

Nashville (BNA) to Denver (DEN)

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

39 min

Flights arriving 15+ minutes late

Flights tracked

4

Scheduled flights in the period

What caused the delays

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

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

Baltimore (BWI) to Myrtle Beach (MYR)

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

59 min

Flights arriving 15+ minutes late

Flights tracked

4

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 91%
• Airline (crew, maintenance, cleaning) 9%
• Air traffic control & airport 0%
• Extreme weather 0%
• Security 0%

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

Las Vegas (LAS) to Baltimore (BWI)

Only 4 flights on record, which is too few for reliable odds.

On-time arrivals

66.7%

Less than 15 minutes late

Cancelled

0.0%

Of scheduled flights

Average delay when late

20 min

Flights arriving 15+ minutes late

Flights tracked

4

Scheduled flights in the period

What caused the delays

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

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

Dallas (DAL) to Salt Lake City (SLC)

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

Buffalo (BUF) to Tampa (TPA)

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

19 min

Flights arriving 15+ minutes late

Flights tracked

1

Scheduled flights in the period

What caused the delays

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

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

Houston (HOU) to Albuquerque (ABQ)

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

Fort Myers (RSW) to St Louis (STL)

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

209 min

Flights arriving 15+ minutes late

Flights tracked

1

Scheduled flights in the period

What caused the delays

• Late-arriving aircraft 80%
• Air traffic control & airport 20%
• Airline (crew, maintenance, cleaning) 0%
• Extreme weather 0%
• Security 0%

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

Sep 2025 Aug 2026

Show as table

Month	On time	Flights
September 2025	72.7%	12
October 2025	77.3%	22
November 2025	66.7%	3
December 2025	94.1%	17
January 2026	100.0%	3
February 2026	80.0%	10
March 2026	0.0%	1
April 2026	85.7%	21
May 2026	80.0%	25
June 2026	86.2%	30
July 2026	100.0%	30
August 2026	100.0%	19

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