Flight UA511
United Airlines flight UA511
Looking for UA511 in the airâŚ
Alerts at this flight's airports
Washington (DCA) to Chicago (ORD)
Historically, this flight arrives 15+ minutes late 26% of the time, and when it is late the delay averages 114 minutes. It was cancelled 3.6% of the time.
- On-time arrivals
- 74.4%
- Less than 15 minutes late
- Cancelled
- 3.6%
- Of scheduled flights
- Average delay when late
- 114 min
- Flights arriving 15+ minutes late
- Flights tracked
- 167
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 59%
- Late-arriving aircraft 35%
- Airline (crew, maintenance, cleaning) 6%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Phoenix (PHX)
Historically, this flight arrives 15+ minutes late 27% of the time, and when it is late the delay averages 59 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 73.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 59 min
- Flights arriving 15+ minutes late
- Flights tracked
- 162
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 43%
- Airline (crew, maintenance, cleaning) 30%
- Air traffic control & airport 21%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 39% of the time, and when it is late the delay averages 85 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 61.4%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 85 min
- Flights arriving 15+ minutes late
- Flights tracked
- 154
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 53%
- Air traffic control & airport 28%
- Airline (crew, maintenance, cleaning) 14%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Philadelphia (PHL) to Chicago (ORD)
Historically, this flight arrives 15+ minutes late 15% of the time, and when it is late the delay averages 83 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 85.5%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 83 min
- Flights arriving 15+ minutes late
- Flights tracked
- 55
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 54%
- Airline (crew, maintenance, cleaning) 37%
- Air traffic control & airport 9%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Phoenix (PHX) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 30% of the time, and when it is late the delay averages 60 minutes. It was cancelled 1.9% of the time.
- On-time arrivals
- 69.8%
- Less than 15 minutes late
- Cancelled
- 1.9%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 54
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 40%
- Air traffic control & airport 38%
- Airline (crew, maintenance, cleaning) 21%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Albany (ALB)
Only 18 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
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 18
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 58%
- Air traffic control & airport 23%
- Airline (crew, maintenance, cleaning) 19%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Denver (DEN) to Kailua-Kona (KOA)
Only 1 flight on record, which is too few for reliable odds.
- On-time arrivals
- 0.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 48 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- 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).
Pittsburgh (PIT) to Newark (EWR)
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
- â
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.5% | 88 |
| October 2025 | 71.6% | 81 |
| November 2025 | 63.3% | 30 |
| December 2025 | 77.4% | 31 |
| January 2026 | 74.2% | 31 |
| February 2026 | 73.1% | 26 |
| March 2026 | 73.1% | 54 |
| April 2026 | 61.4% | 59 |
| May 2026 | 77.5% | 40 |
| June 2026 | 70.9% | 56 |
| July 2026 | 65.5% | 57 |
| August 2026 | 63.8% | 59 |
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