Skip to content
FriendlySkies Review
Menu

Flight UA1851

United Airlines flight UA1851

Read United Airlines reviews →

Looking for UA1851 in the air…

  • Advisory Coastal Flood Statement FLL

    COASTAL FLOOD STATEMENT NOW IN EFFECT THROUGH THURSDAY EVENING

    Weather

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

    COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1 PM PST MONDAY

    Weather

Fort Lauderdale (FLL) to Chicago (ORD)

Historically, this flight arrives 15+ minutes late 26% of the time, and when it is late the delay averages 87 minutes. It was cancelled 0.0% of the time.

On-time arrivals
74.4%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
87 min
Flights arriving 15+ minutes late
Flights tracked
82
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 56%
  • Late-arriving aircraft 36%
  • Airline (crew, maintenance, cleaning) 5%
  • Extreme weather 3%
  • Security 0%

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

Chicago (ORD) to Houston (IAH)

Historically, this flight arrives 15+ minutes late 29% of the time, and when it is late the delay averages 66 minutes. It was cancelled 1.9% of the time.

On-time arrivals
70.6%
Less than 15 minutes late
Cancelled
1.9%
Of scheduled flights
Average delay when late
66 min
Flights arriving 15+ minutes late
Flights tracked
52
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 34%
  • Air traffic control & airport 29%
  • Airline (crew, maintenance, cleaning) 26%
  • Extreme weather 10%
  • Security 0%

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

Chicago (ORD) to Kansas City (MCI)

Historically, this flight arrives 15+ minutes late 41% of the time, and when it is late the delay averages 99 minutes. It was cancelled 4.3% of the time.

On-time arrivals
59.1%
Less than 15 minutes late
Cancelled
4.3%
Of scheduled flights
Average delay when late
99 min
Flights arriving 15+ minutes late
Flights tracked
47
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 71%
  • Airline (crew, maintenance, cleaning) 25%
  • Air traffic control & airport 2%
  • Extreme weather 2%
  • Security 0%

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

Houston (IAH) to Los Angeles (LAX)

Historically, this flight arrives 15+ minutes late 21% of the time, and when it is late the delay averages 72 minutes. It was cancelled 0.0% of the time.

On-time arrivals
78.6%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
72 min
Flights arriving 15+ minutes late
Flights tracked
42
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 80%
  • Late-arriving aircraft 14%
  • Air traffic control & airport 6%
  • Extreme weather 0%
  • Security 0%

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

Chicago (ORD) to Providence/Warwick (PVD)

Historically, this flight arrives 15+ minutes late 43% of the time, and when it is late the delay averages 69 minutes. It was cancelled 2.8% of the time.

On-time arrivals
57.1%
Less than 15 minutes late
Cancelled
2.8%
Of scheduled flights
Average delay when late
69 min
Flights arriving 15+ minutes late
Flights tracked
36
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 62%
  • Air traffic control & airport 22%
  • Late-arriving aircraft 16%
  • Extreme weather 0%
  • Security 0%

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

Denver (DEN) to Salt Lake City (SLC)

Historically, this flight arrives 15+ minutes late 46% of the time, and when it is late the delay averages 54 minutes. It was cancelled 0.0% of the time.

On-time arrivals
54.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
54 min
Flights arriving 15+ minutes late
Flights tracked
35
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 51%
  • Airline (crew, maintenance, cleaning) 31%
  • Air traffic control & airport 11%
  • Extreme weather 6%
  • Security 0%

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

Boston (BOS) to Houston (IAH)

Historically, this flight arrives 15+ minutes late 32% of the time, and when it is late the delay averages 85 minutes. It was cancelled 0.0% of the time.

On-time arrivals
67.7%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
85 min
Flights arriving 15+ minutes late
Flights tracked
31
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 90%
  • Airline (crew, maintenance, cleaning) 6%
  • Air traffic control & airport 3%
  • Extreme weather 0%
  • Security 0%

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

Dallas-Fort Worth (DFW) to San Francisco (SFO)

Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 49 minutes. It was cancelled 0.0% of the time.

On-time arrivals
95.8%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
49 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

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

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

Chicago (ORD) to Ontario (ONT)

Historically, this flight arrives 15+ minutes late 48% of the time, and when it is late the delay averages 82 minutes. It was cancelled 4.2% of the time.

On-time arrivals
52.2%
Less than 15 minutes late
Cancelled
4.2%
Of scheduled flights
Average delay when late
82 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 45%
  • Air traffic control & airport 22%
  • Extreme weather 19%
  • Airline (crew, maintenance, cleaning) 14%
  • Security 0%

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

San Francisco (SFO) to Los Angeles (LAX)

Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 101 minutes. It was cancelled 0.0% of the time.

On-time arrivals
95.8%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
101 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 76%
  • Air traffic control & airport 24%
  • Airline (crew, maintenance, cleaning) 0%
  • Extreme weather 0%
  • Security 0%

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

Miami (MIA) to Houston (IAH)

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
21
Scheduled flights in the period

Kalispell (FCA) to Denver (DEN)

Only 19 flights on record, which is too few for reliable odds.

On-time arrivals
61.1%
Less than 15 minutes late
Cancelled
5.3%
Of scheduled flights
Average delay when late
64 min
Flights arriving 15+ minutes late
Flights tracked
19
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 59%
  • Airline (crew, maintenance, cleaning) 38%
  • Air traffic control & airport 2%
  • Extreme weather 0%
  • Security 0%

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

Ontario (ONT) to San Francisco (SFO)

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

On-time arrivals
33.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
65 min
Flights arriving 15+ minutes late
Flights tracked
15
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).

San Francisco (SFO) to Chicago (ORD)

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

On-time arrivals
55.6%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
62 min
Flights arriving 15+ minutes late
Flights tracked
9
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 52%
  • Air traffic control & airport 41%
  • Late-arriving aircraft 7%
  • Extreme weather 0%
  • Security 0%

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

San Francisco (SFO) to Tucson (TUS)

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

More headlines →

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

On-time arrivals by month
Sep 2025 Aug 2026
Show as table
MonthOn timeFlights
September 2025 86.2% 58
October 2025 80.4% 51
November 2025 73.3% 46
December 2025 68.8% 32
January 2026 61.8% 57
February 2026 78.9% 38
March 2026 58.8% 52
April 2026 0.0% 1
May 2026 48.6% 35
June 2026 56.7% 30
July 2026 55.2% 31
August 2026 90.0% 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

More headlines →

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