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Flight UA1734

United Airlines flight UA1734

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Looking for UA1734 in the air…

Boston (BOS) to Dulles (IAD)

Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 60 minutes. It was cancelled 2.3% of the time.

On-time arrivals
96.1%
Less than 15 minutes late
Cancelled
2.3%
Of scheduled flights
Average delay when late
60 min
Flights arriving 15+ minutes late
Flights tracked
345
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 74%
  • Air traffic control & airport 21%
  • Extreme weather 5%
  • Late-arriving aircraft 0%
  • Security 0%

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

Dulles (IAD) to Los Angeles (LAX)

Historically, this flight arrives 15+ minutes late 14% of the time, and when it is late the delay averages 88 minutes. It was cancelled 1.5% of the time.

On-time arrivals
86.5%
Less than 15 minutes late
Cancelled
1.5%
Of scheduled flights
Average delay when late
88 min
Flights arriving 15+ minutes late
Flights tracked
203
Scheduled flights in the period

What caused the delays

  • Late-arriving aircraft 41%
  • Airline (crew, maintenance, cleaning) 37%
  • Air traffic control & airport 15%
  • Extreme weather 7%
  • Security 0%

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

Dulles (IAD) to Pittsburgh (PIT)

Historically, this flight arrives 15+ minutes late 2% of the time, and when it is late the delay averages 44 minutes. It was cancelled 0.0% of the time.

On-time arrivals
98.0%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
44 min
Flights arriving 15+ minutes late
Flights tracked
52
Scheduled flights in the period

What caused the delays

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

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

Dulles (IAD) to Austin (AUS)

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

On-time arrivals
86.7%
Less than 15 minutes late
Cancelled
0.0%
Of scheduled flights
Average delay when late
85 min
Flights arriving 15+ minutes late
Flights tracked
15
Scheduled flights in the period

What caused the delays

  • Airline (crew, maintenance, cleaning) 93%
  • Air traffic control & airport 7%
  • Late-arriving aircraft 0%
  • Extreme weather 0%
  • Security 0%

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

Dulles (IAD) to Bozeman (BZN)

Only 6 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
6
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 100.0% 40
October 2025 94.3% 53
November 2025 100.0% 55
December 2025 89.1% 46
January 2026 80.4% 50
February 2026 85.4% 50
March 2026 89.7% 59
April 2026 93.3% 60
May 2026 98.3% 60
June 2026 94.3% 54
July 2026 95.2% 44
August 2026 94.0% 50

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.