Flight UA1734
United Airlines flight UA1734
Looking for UA1734 in the airâŚ
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
- â
- Flights arriving 15+ minutes late
- Flights tracked
- 6
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| 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 â August 2026. Covers flights operated by reporting U.S. carriers. About our data