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Flight UA2104

United Airlines flight UA2104

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  • 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

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  • Advisory Airport Closure SNA

    Airport Closure at John Wayne Orange County International Airport (SNA): Reopens Nov 08 at 14:15 UTC.

    Airport status

  • Advisory Coastal Flood Advisory CLD, SAN, SNA

    COASTAL FLOOD ADVISORY IN EFFECT FROM 4 AM FRIDAY TO NOON PST TUESDAY

    Weather

Chicago (ORD) to Boston (BOS)

Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 90 minutes. It was cancelled 0.0% of the time.

On-time arrivals
95.6%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
90 min
Flights arriving 15+ minutes late
Flights tracked
90
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 70%
  • Airline (crew, maintenance, cleaning) 21%
  • Air traffic control & airport 9%
  • Extreme weather 0%
  • Security 0%

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

Newark (EWR) to Charlotte (CLT)

Historically, this flight arrives 15+ minutes late 45% of the time, and when it is late the delay averages 151 minutes. It was cancelled 4.3% of the time.

On-time arrivals
54.5%
Less than 15 minutes late
Cancelled
4.3%
Of scheduled flights
Average delay when late
151 min
Flights arriving 15+ minutes late
Flights tracked
46
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 46%
  • Airline (crew, maintenance, cleaning) 34%
  • Air traffic control & airport 12%
  • Extreme weather 9%
  • Security 0%

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

Newark (EWR) to Santa Ana (SNA)

Historically, this flight arrives 15+ minutes late 11% of the time, and when it is late the delay averages 61 minutes. It was cancelled 2.7% of the time.

On-time arrivals
88.9%
Less than 15 minutes late
Cancelled
2.7%
Of scheduled flights
Average delay when late
61 min
Flights arriving 15+ minutes late
Flights tracked
37
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 62%
  • Late-arriving aircraft 30%
  • Airline (crew, maintenance, cleaning) 7%
  • Extreme weather 0%
  • Security 0%

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

St Louis (STL) to Newark (EWR)

Historically, this flight arrives 15+ minutes late 9% of the time, and when it is late the delay averages 60 minutes. It was cancelled 0.0% of the time.

On-time arrivals
91.2%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
60 min
Flights arriving 15+ minutes late
Flights tracked
34
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 72%
  • Extreme weather 26%
  • Air traffic control & airport 3%
  • Late-arriving aircraft 0%
  • Security 0%

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

Savannah (SAV) to Newark (EWR)

Historically, this flight arrives 15+ minutes late 23% of the time, and when it is late the delay averages 92 minutes. It was cancelled 3.1% of the time.

On-time arrivals
77.4%
Less than 15 minutes late
Cancelled
3.1%
Of scheduled flights
Average delay when late
92 min
Flights arriving 15+ minutes late
Flights tracked
32
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 48%
  • Extreme weather 33%
  • Air traffic control & airport 10%
  • Airline (crew, maintenance, cleaning) 8%
  • Security 0%

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

Knoxville/Maryville (TYS) to Denver (DEN)

Historically, this flight arrives 15+ minutes late 12% of the time, and when it is late the delay averages 75 minutes. It was cancelled 0.0% of the time.

On-time arrivals
87.5%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
75 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 75%
  • Late-arriving aircraft 19%
  • Extreme weather 4%
  • Airline (crew, maintenance, cleaning) 2%
  • Security 0%

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

Newark (EWR) to Portland (PDX)

Historically, this flight arrives 15+ minutes late 20% of the time, and when it is late the delay averages 79 minutes. It was cancelled 4.8% of the time.

On-time arrivals
80.0%
Less than 15 minutes late
Cancelled
4.8%
Of scheduled flights
Average delay when late
79 min
Flights arriving 15+ minutes late
Flights tracked
21
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 74%
  • Late-arriving aircraft 24%
  • Airline (crew, maintenance, cleaning) 2%
  • Extreme weather 0%
  • Security 0%

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

Chicago (ORD) to Hartford (BDL)

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

Boston (BOS) to Newark (EWR)

Only 17 flights on record, which is too few for reliable odds.

On-time arrivals
62.5%
Less than 15 minutes late
Cancelled
5.9%
Of scheduled flights
Average delay when late
47 min
Flights arriving 15+ minutes late
Flights tracked
17
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 43%
  • Air traffic control & airport 43%
  • Airline (crew, maintenance, cleaning) 13%
  • Extreme weather 0%
  • Security 0%

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

Houston (IAH) to San Diego (SAN)

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

What caused the delays

  • Airline (crew, maintenance, cleaning) 48%
  • Late-arriving aircraft 31%
  • Air traffic control & airport 21%
  • Extreme weather 0%
  • Security 0%

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

Denver (DEN) to Philadelphia (PHL)

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

On-time arrivals
80.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
51 min
Flights arriving 15+ minutes late
Flights tracked
15
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 53%
  • Airline (crew, maintenance, cleaning) 45%
  • Air traffic control & airport 2%
  • Extreme weather 0%
  • Security 0%

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

Charleston (CHS) 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

San Jose (SJC) to Las Vegas (LAS)

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

Sacramento (SMF) to Los Angeles (LAX)

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 90.5% 21
October 2025 100.0% 22
November 2025 100.0% 19
December 2025 67.9% 28
January 2026 80.4% 53
February 2026 83.8% 38
March 2026 90.0% 30
April 2026 96.2% 26
May 2026 96.8% 31
June 2026 93.3% 30
July 2026 57.1% 30
August 2026 48.1% 28

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.