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Flight UA636

United Airlines flight UA636

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

    COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1 PM PST MONDAY

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Chicago (ORD) to Burlington (BTV)

Historically, this flight arrives 15+ minutes late 40% of the time, and when it is late the delay averages 68 minutes. It was cancelled 0.6% of the time.

On-time arrivals
59.7%
Less than 15 minutes late
Cancelled
0.6%
Of scheduled flights
Average delay when late
68 min
Flights arriving 15+ minutes late
Flights tracked
345
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 44%
  • Airline (crew, maintenance, cleaning) 26%
  • Air traffic control & airport 23%
  • Extreme weather 8%
  • Security 0%

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

Hayden (HDN) to Chicago (ORD)

Historically, this flight arrives 15+ minutes late 28% of the time, and when it is late the delay averages 123 minutes. It was cancelled 1.1% of the time.

On-time arrivals
71.6%
Less than 15 minutes late
Cancelled
1.1%
Of scheduled flights
Average delay when late
123 min
Flights arriving 15+ minutes late
Flights tracked
90
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 46%
  • Airline (crew, maintenance, cleaning) 28%
  • Air traffic control & airport 25%
  • Extreme weather 1%
  • Security 0%

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

Missoula (MSO) to Chicago (ORD)

Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 137 minutes. It was cancelled 3.7% of the time.

On-time arrivals
80.5%
Less than 15 minutes late
Cancelled
3.7%
Of scheduled flights
Average delay when late
137 min
Flights arriving 15+ minutes late
Flights tracked
82
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 58%
  • Late-arriving aircraft 23%
  • Airline (crew, maintenance, cleaning) 19%
  • Extreme weather 0%
  • Security 0%

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

Pensacola (PNS) to Chicago (ORD)

Historically, this flight arrives 15+ minutes late 14% of the time, and when it is late the delay averages 80 minutes. It was cancelled 1.5% of the time.

On-time arrivals
86.2%
Less than 15 minutes late
Cancelled
1.5%
Of scheduled flights
Average delay when late
80 min
Flights arriving 15+ minutes late
Flights tracked
66
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 72%
  • Air traffic control & airport 23%
  • Airline (crew, maintenance, cleaning) 5%
  • Extreme weather 0%
  • Security 0%

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

Tucson (TUS) to Chicago (ORD)

Historically, this flight arrives 15+ minutes late 22% of the time, and when it is late the delay averages 93 minutes. It was cancelled 0.0% of the time.

On-time arrivals
78.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
93 min
Flights arriving 15+ minutes late
Flights tracked
23
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 74%
  • Air traffic control & airport 24%
  • Airline (crew, maintenance, cleaning) 3%
  • Extreme weather 0%
  • Security 0%

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

Chicago (ORD) to San Francisco (SFO)

Only 16 flights on record, which is too few for reliable odds.

On-time arrivals
68.8%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
62 min
Flights arriving 15+ minutes late
Flights tracked
16
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 52%
  • Extreme weather 28%
  • Airline (crew, maintenance, cleaning) 19%
  • Air traffic control & airport 1%
  • Security 0%

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

Chicago (ORD) to Newark (EWR)

Only 2 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
2
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 78.0% 59
October 2025 78.6% 56
November 2025 71.4% 29
December 2025 76.7% 61
January 2026 70.0% 62
February 2026 66.1% 56
March 2026 58.3% 62
April 2026 57.1% 35
May 2026 65.0% 42
June 2026 74.1% 60
July 2026 61.0% 61
August 2026 50.0% 41

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.