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Flight UA515

United Airlines flight UA515

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Looking for UA515 in the air…

Newark (EWR) to San Antonio (SAT)

Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 60 minutes. It was cancelled 1.4% of the time.

On-time arrivals
86.8%
Less than 15 minutes late
Cancelled
1.4%
Of scheduled flights
Average delay when late
60 min
Flights arriving 15+ minutes late
Flights tracked
362
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 38%
  • Airline (crew, maintenance, cleaning) 35%
  • Late-arriving aircraft 22%
  • Extreme weather 5%
  • Security 0%

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

San Antonio (SAT) to Houston (IAH)

Historically, this flight arrives 15+ minutes late 17% of the time, and when it is late the delay averages 65 minutes. It was cancelled 0.8% of the time.

On-time arrivals
82.6%
Less than 15 minutes late
Cancelled
0.8%
Of scheduled flights
Average delay when late
65 min
Flights arriving 15+ minutes late
Flights tracked
133
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 69%
  • Late-arriving aircraft 29%
  • Airline (crew, maintenance, cleaning) 2%
  • Extreme weather 0%
  • Security 0%

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

San Antonio (SAT) to Denver (DEN)

Historically, this flight arrives 15+ minutes late 24% of the time, and when it is late the delay averages 61 minutes. It was cancelled 0.0% of the time.

On-time arrivals
76.4%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
61 min
Flights arriving 15+ minutes late
Flights tracked
55
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 92%
  • Late-arriving aircraft 7%
  • Airline (crew, maintenance, cleaning) 1%
  • Extreme weather 0%
  • Security 0%

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

Houston (IAH) to Seattle (SEA)

Historically, this flight arrives 15+ minutes late 7% of the time, and when it is late the delay averages 52 minutes. It was cancelled 0.0% of the time.

On-time arrivals
93.1%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
52 min
Flights arriving 15+ minutes late
Flights tracked
29
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 60%
  • Airline (crew, maintenance, cleaning) 30%
  • Late-arriving aircraft 10%
  • Extreme weather 0%
  • Security 0%

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

Denver (DEN) to Tampa (TPA)

Only 3 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
3
Scheduled flights in the period

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On-time arrivals by month
Sep 2025 Aug 2026
Show as table
MonthOn timeFlights
September 2025 85.0% 60
October 2025 71.4% 56
November 2025 93.3% 30
December 2025 82.2% 45
January 2026 91.8% 62
February 2026 97.2% 39
March 2026 78.9% 58
April 2026 85.4% 89
May 2026 90.2% 51
June 2026 86.7% 30
July 2026 82.8% 31
August 2026 83.9% 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.