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Flight UA1257

United Airlines flight UA1257

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Looking for UA1257 in the air…

  • 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

    Read the story →
  • 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

Miami (MIA) to San Francisco (SFO)

Historically, this flight arrives 15+ minutes late 11% of the time, and when it is late the delay averages 55 minutes. It was cancelled 0.6% of the time.

On-time arrivals
89.2%
Less than 15 minutes late
Cancelled
0.6%
Of scheduled flights
Average delay when late
55 min
Flights arriving 15+ minutes late
Flights tracked
158
Scheduled flights in the period

What caused the delays

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

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

Dulles (IAD) to Hartford (BDL)

Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 37 minutes. It was cancelled 0.9% of the time.

On-time arrivals
90.4%
Less than 15 minutes late
Cancelled
0.9%
Of scheduled flights
Average delay when late
37 min
Flights arriving 15+ minutes late
Flights tracked
115
Scheduled flights in the period

What caused the delays

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

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

San Francisco (SFO) to San Diego (SAN)

Historically, this flight arrives 15+ minutes late 39% of the time, and when it is late the delay averages 59 minutes. It was cancelled 0.0% of the time.

On-time arrivals
61.2%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
59 min
Flights arriving 15+ minutes late
Flights tracked
103
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 58%
  • Air traffic control & airport 26%
  • Airline (crew, maintenance, cleaning) 16%
  • Extreme weather 0%
  • Security 0%

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

Raleigh/Durham (RDU) to Dulles (IAD)

Historically, this flight arrives 15+ minutes late 15% of the time, and when it is late the delay averages 52 minutes. It was cancelled 3.4% of the time.

On-time arrivals
84.7%
Less than 15 minutes late
Cancelled
3.4%
Of scheduled flights
Average delay when late
52 min
Flights arriving 15+ minutes late
Flights tracked
88
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 68%
  • Air traffic control & airport 32%
  • Late-arriving aircraft 0%
  • Extreme weather 0%
  • Security 0%

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

Chicago (ORD) to Miami (MIA)

Only 17 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
17
Scheduled flights in the period

St Louis (STL) to San Francisco (SFO)

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

On-time arrivals
40.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
52 min
Flights arriving 15+ minutes late
Flights tracked
15
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 97%
  • Airline (crew, maintenance, cleaning) 3%
  • Late-arriving aircraft 0%
  • Extreme weather 0%
  • Security 0%

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

Nashville (BNA) to Newark (EWR)

Only 3 flights on record, which is too few for reliable odds.

On-time arrivals
100.0%
Less than 15 minutes late
Cancelled
33.3%
Of scheduled flights
Average delay when late
—
Flights arriving 15+ minutes late
Flights tracked
3
Scheduled flights in the period

Newark (EWR) to Atlanta (ATL)

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

Providence/Warwick (PVD) to Chicago (ORD)

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 96.3% 27
October 2025 88.9% 36
November 2025 90.7% 54
December 2025 87.2% 47
January 2026 85.7% 30
February 2026 87.5% 27
March 2026 93.5% 31
April 2026 80.0% 30
May 2026 73.2% 41
June 2026 83.1% 60
July 2026 79.0% 62
August 2026 55.4% 56

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.