Flight UA2321
United Airlines flight UA2321
Looking for UA2321 in the airâŚ
Alerts at this flight's airports
Orlando (MCO) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 30% of the time, and when it is late the delay averages 115 minutes. It was cancelled 1.2% of the time.
- On-time arrivals
- 70.0%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 115 min
- Flights arriving 15+ minutes late
- Flights tracked
- 172
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 59%
- Late-arriving aircraft 25%
- Airline (crew, maintenance, cleaning) 10%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Denver (DEN) to Orlando (MCO)
Historically, this flight arrives 15+ minutes late 6% of the time, and when it is late the delay averages 53 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 93.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 53 min
- Flights arriving 15+ minutes late
- Flights tracked
- 82
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 60%
- Late-arriving aircraft 21%
- Air traffic control & airport 20%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Newark (EWR) to Salt Lake City (SLC)
Historically, this flight arrives 15+ minutes late 23% of the time, and when it is late the delay averages 68 minutes. It was cancelled 4.4% of the time.
- On-time arrivals
- 76.6%
- Less than 15 minutes late
- Cancelled
- 4.4%
- Of scheduled flights
- Average delay when late
- 68 min
- Flights arriving 15+ minutes late
- Flights tracked
- 68
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 32%
- Airline (crew, maintenance, cleaning) 30%
- Late-arriving aircraft 29%
- Extreme weather 9%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Portland (PDX) to Chicago (ORD)
Historically, this flight arrives 15+ minutes late 30% of the time, and when it is late the delay averages 74 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 70.3%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 74 min
- Flights arriving 15+ minutes late
- Flights tracked
- 37
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 43%
- Late-arriving aircraft 35%
- Air traffic control & airport 22%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Dulles (IAD) to Boston (BOS)
Historically, this flight arrives 15+ minutes late 16% of the time, and when it is late the delay averages 75 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 83.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 75 min
- Flights arriving 15+ minutes late
- Flights tracked
- 31
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 77%
- Airline (crew, maintenance, cleaning) 12%
- Late-arriving aircraft 11%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Dulles (IAD)
Historically, this flight arrives 15+ minutes late 10% of the time, and when it is late the delay averages 132 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 90.3%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 132 min
- Flights arriving 15+ minutes late
- Flights tracked
- 31
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 88%
- Air traffic control & airport 11%
- Airline (crew, maintenance, cleaning) 1%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Newark (EWR) to Phoenix (PHX)
Historically, this flight arrives 15+ minutes late 42% of the time, and when it is late the delay averages 96 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 57.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 96 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 71%
- Air traffic control & airport 16%
- Airline (crew, maintenance, cleaning) 12%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 77.8% | 36 |
| October 2025 | 82.1% | 56 |
| November 2025 | 60.7% | 29 |
| December 2025 | 73.3% | 31 |
| January 2026 | 74.2% | 31 |
| February 2026 | 80.0% | 28 |
| March 2026 | 59.2% | 49 |
| April 2026 | 81.0% | 59 |
| May 2026 | 83.9% | 31 |
| June 2026 | 100.0% | 30 |
| July 2026 | 96.7% | 31 |
| August 2026 | 62.1% | 31 |
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