Flight UA1831
United Airlines flight UA1831
Looking for UA1831 in the airâŚ
Atlanta (ATL) to Dulles (IAD)
Historically, this flight arrives 15+ minutes late 24% of the time, and when it is late the delay averages 102 minutes. It was cancelled 0.8% of the time.
- On-time arrivals
- 76.2%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 102 min
- Flights arriving 15+ minutes late
- Flights tracked
- 361
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 47%
- Air traffic control & airport 29%
- Airline (crew, maintenance, cleaning) 12%
- Extreme weather 12%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Dulles (IAD) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 43% of the time, and when it is late the delay averages 152 minutes. It was cancelled 2.9% of the time.
- On-time arrivals
- 56.9%
- Less than 15 minutes late
- Cancelled
- 2.9%
- Of scheduled flights
- Average delay when late
- 152 min
- Flights arriving 15+ minutes late
- Flights tracked
- 210
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 40%
- Extreme weather 29%
- Late-arriving aircraft 19%
- Airline (crew, maintenance, cleaning) 12%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Atlanta (ATL)
Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 65 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 90.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 65 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 59%
- Airline (crew, maintenance, cleaning) 23%
- Air traffic control & airport 18%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
PBI â EWR
Only 3 flights on record, which is too few for reliable odds.
- On-time arrivals
- 66.7%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 82 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 65%
- Late-arriving aircraft 35%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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Headlines found by Google News; stories open on the publisher's site.
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 70.0% | 30 |
| October 2025 | 80.6% | 31 |
| November 2025 | 70.0% | 30 |
| December 2025 | 69.8% | 43 |
| January 2026 | 70.6% | 35 |
| February 2026 | 83.1% | 60 |
| March 2026 | 64.5% | 64 |
| April 2026 | 76.7% | 60 |
| May 2026 | 82.0% | 62 |
| June 2026 | 70.0% | 60 |
| July 2026 | 43.1% | 62 |
| August 2026 | 63.2% | 58 |
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