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Flight UA1231

United Airlines flight UA1231

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Looking for UA1231 in the air…

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

    COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1 PM PST MONDAY

    Weather

Chicago (ORD) to Houston (IAH)

Historically, this flight arrives 15+ minutes late 9% of the time, and when it is late the delay averages 74 minutes. It was cancelled 1.5% of the time.

On-time arrivals
91.4%
Less than 15 minutes late
Cancelled
1.5%
Of scheduled flights
Average delay when late
74 min
Flights arriving 15+ minutes late
Flights tracked
270
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 40%
  • Late-arriving aircraft 39%
  • Airline (crew, maintenance, cleaning) 21%
  • Extreme weather 0%
  • Security 0%

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

Houston (IAH) to Eagle (EGE)

Historically, this flight arrives 15+ minutes late 34% of the time, and when it is late the delay averages 79 minutes. It was cancelled 0.0% of the time.

On-time arrivals
65.7%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
79 min
Flights arriving 15+ minutes late
Flights tracked
35
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 43%
  • Air traffic control & airport 29%
  • Extreme weather 24%
  • Airline (crew, maintenance, cleaning) 4%
  • Security 0%

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

Las Vegas (LAS) to Chicago (ORD)

Historically, this flight arrives 15+ minutes late 0% of the time. It was cancelled 0.0% of the time.

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
32
Scheduled flights in the period

Miami (MIA) to Newark (EWR)

Historically, this flight arrives 15+ minutes late 23% of the time, and when it is late the delay averages 86 minutes. It was cancelled 0.0% of the time.

On-time arrivals
76.9%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
86 min
Flights arriving 15+ minutes late
Flights tracked
26
Scheduled flights in the period

What caused the delays

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

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

Newark (EWR) to Orlando (MCO)

Historically, this flight arrives 15+ minutes late 29% of the time, and when it is late the delay averages 51 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
51 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 68%
  • Late-arriving aircraft 23%
  • Extreme weather 8%
  • Airline (crew, maintenance, cleaning) 1%
  • Security 0%

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

Chicago (ORD) to Jacksonville (JAX)

Historically, this flight arrives 15+ minutes late 22% of the time, and when it is late the delay averages 80 minutes. It was cancelled 0.0% of the time.

On-time arrivals
78.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
80 min
Flights arriving 15+ minutes late
Flights tracked
23
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 34%
  • Airline (crew, maintenance, cleaning) 31%
  • Late-arriving aircraft 30%
  • Extreme weather 5%
  • Security 0%

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

Detroit (DTW) to Chicago (ORD)

Only 16 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
343 min
Flights arriving 15+ minutes late
Flights tracked
16
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 55%
  • Air traffic control & airport 45%
  • Late-arriving aircraft 0%
  • Extreme weather 0%
  • Security 0%

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

San Francisco (SFO) to Albuquerque (ABQ)

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

Jackson (JAC) to Denver (DEN)

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 72.4% 29
October 2025 81.5% 27
November 2025 93.3% 30
December 2025 83.3% 42
January 2026 88.4% 43
February 2026 79.2% 48
March 2026 84.8% 34
April 2026 86.7% 46
May 2026 94.3% 35
June 2026 97.0% 33
July 2026 90.0% 31
August 2026 96.7% 31

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.