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Flight UA1631

United Airlines flight UA1631

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Looking for UA1631 in the air…

Newark (EWR) to Las Vegas (LAS)

Historically, this flight arrives 15+ minutes late 15% of the time, and when it is late the delay averages 71 minutes. It was cancelled 0.6% of the time.

On-time arrivals
85.4%
Less than 15 minutes late
Cancelled
0.6%
Of scheduled flights
Average delay when late
71 min
Flights arriving 15+ minutes late
Flights tracked
180
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 44%
  • Airline (crew, maintenance, cleaning) 32%
  • Air traffic control & airport 23%
  • Extreme weather 0%
  • Security 0%

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

Las Vegas (LAS) to Los Angeles (LAX)

Historically, this flight arrives 15+ minutes late 16% of the time, and when it is late the delay averages 54 minutes. It was cancelled 0.7% of the time.

On-time arrivals
83.9%
Less than 15 minutes late
Cancelled
0.7%
Of scheduled flights
Average delay when late
54 min
Flights arriving 15+ minutes late
Flights tracked
150
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 72%
  • Airline (crew, maintenance, cleaning) 19%
  • Air traffic control & airport 8%
  • Extreme weather 0%
  • Security 0%

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

Los Angeles (LAX) to Dulles (IAD)

Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 20 minutes. It was cancelled 0.0% of the time.

On-time arrivals
90.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
20 min
Flights arriving 15+ minutes late
Flights tracked
31
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 68%
  • Air traffic control & airport 27%
  • Airline (crew, maintenance, cleaning) 5%
  • Extreme weather 0%
  • Security 0%

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

Denver (DEN) to Knoxville/Maryville (TYS)

Historically, this flight arrives 15+ minutes late 8% of the time, and when it is late the delay averages 50 minutes. It was cancelled 0.0% of the time.

On-time arrivals
91.7%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
50 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 65%
  • Late-arriving aircraft 35%
  • Airline (crew, maintenance, cleaning) 0%
  • Extreme weather 0%
  • Security 0%

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

Kansas City (MCI) 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

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On-time arrivals by month
Sep 2025 Aug 2026
Show as table
MonthOn timeFlights
September 2025 90.0% 30
October 2025 93.5% 31
November 2025 82.8% 30
December 2025 83.9% 31
January 2026 75.0% 28
February 2026 85.7% 28
March 2026 89.1% 55
April 2026 93.1% 30
May 2026 93.5% 31
June 2026 83.3% 30
July 2026 86.7% 31
August 2026 67.7% 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.