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Flight UA635

United Airlines flight UA635

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Looking for UA635 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

Hartford (BDL) to Dulles (IAD)

Historically, this flight arrives 15+ minutes late 6% of the time, and when it is late the delay averages 81 minutes. It was cancelled 1.7% of the time.

On-time arrivals
93.7%
Less than 15 minutes late
Cancelled
1.7%
Of scheduled flights
Average delay when late
81 min
Flights arriving 15+ minutes late
Flights tracked
355
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 58%
  • Late-arriving aircraft 23%
  • Air traffic control & airport 18%
  • Extreme weather 0%
  • Security 0%

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

Dulles (IAD) to San Francisco (SFO)

Historically, this flight arrives 15+ minutes late 18% of the time, and when it is late the delay averages 63 minutes. It was cancelled 0.0% of the time.

On-time arrivals
82.2%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
63 min
Flights arriving 15+ minutes late
Flights tracked
73
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 65%
  • Airline (crew, maintenance, cleaning) 29%
  • Late-arriving aircraft 5%
  • Extreme weather 0%
  • Security 0%

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

Dulles (IAD) to Albuquerque (ABQ)

Historically, this flight arrives 15+ minutes late 17% of the time, and when it is late the delay averages 175 minutes. It was cancelled 0.0% of the time.

On-time arrivals
83.3%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
175 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

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

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

Dulles (IAD) to Raleigh/Durham (RDU)

Historically, this flight arrives 15+ minutes late 8% of the time, and when it is late the delay averages 48 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
48 min
Flights arriving 15+ minutes late
Flights tracked
24
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 100%
  • Late-arriving aircraft 0%
  • Air traffic control & airport 0%
  • Extreme weather 0%
  • Security 0%

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

IAD → PBI

Historically, this flight arrives 15+ minutes late 20% of the time, and when it is late the delay averages 24 minutes. It was cancelled 0.0% of the time.

On-time arrivals
80.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
24 min
Flights arriving 15+ minutes late
Flights tracked
21
Scheduled flights in the period

What caused the delays

  • Air traffic control & airport 75%
  • Airline (crew, maintenance, cleaning) 25%
  • 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 19% of the time, and when it is late the delay averages 51 minutes. It was cancelled 0.0% of the time.

On-time arrivals
81.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
51 min
Flights arriving 15+ minutes late
Flights tracked
21
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 79%
  • Air traffic control & airport 12%
  • Airline (crew, maintenance, cleaning) 9%
  • Extreme weather 0%
  • Security 0%

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

San Francisco (SFO) to Nashville (BNA)

Historically, this flight arrives 15+ minutes late 50% of the time, and when it is late the delay averages 95 minutes. It was cancelled 0.0% of the time.

On-time arrivals
50.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
95 min
Flights arriving 15+ minutes late
Flights tracked
20
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 76%
  • Airline (crew, maintenance, cleaning) 21%
  • Air traffic control & airport 3%
  • Extreme weather 0%
  • Security 0%

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

San Francisco (SFO) to Boston (BOS)

Only 4 flights on record, which is too few for reliable odds.

On-time arrivals
75.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
40 min
Flights arriving 15+ minutes late
Flights tracked
4
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 100%
  • Airline (crew, maintenance, cleaning) 0%
  • Air traffic control & airport 0%
  • Extreme weather 0%
  • Security 0%

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

San Francisco (SFO) to Redmond (RDM)

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 88.0% 50
October 2025 93.5% 31
November 2025 96.7% 30
December 2025 90.0% 31
January 2026 86.2% 31
February 2026 88.1% 45
March 2026 91.1% 56
April 2026 94.3% 53
May 2026 83.1% 89
June 2026 81.8% 67
July 2026 93.1% 29
August 2026 93.5% 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.