Flight UA2123
United Airlines flight UA2123
Looking for UA2123 in the airâŚ
Alerts at this flight's airports
Denver (DEN) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 43% of the time, and when it is late the delay averages 66 minutes. It was cancelled 0.3% of the time.
- On-time arrivals
- 56.6%
- Less than 15 minutes late
- Cancelled
- 0.3%
- Of scheduled flights
- Average delay when late
- 66 min
- Flights arriving 15+ minutes late
- Flights tracked
- 306
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 50%
- Late-arriving aircraft 27%
- Airline (crew, maintenance, cleaning) 23%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Kansas City (MCI) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 35% of the time, and when it is late the delay averages 71 minutes. It was cancelled 0.4% of the time.
- On-time arrivals
- 65.1%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 71 min
- Flights arriving 15+ minutes late
- Flights tracked
- 272
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 63%
- Late-arriving aircraft 22%
- Airline (crew, maintenance, cleaning) 13%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Jose (SJC) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 14% of the time, and when it is late the delay averages 90 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 85.7%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 90 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 91%
- Late-arriving aircraft 9%
- Airline (crew, maintenance, cleaning) 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 | 63.3% | 30 |
| October 2025 | 48.6% | 37 |
| November 2025 | 71.9% | 58 |
| December 2025 | 62.5% | 32 |
| January 2026 | 71.4% | 56 |
| February 2026 | 79.6% | 54 |
| March 2026 | 80.6% | 62 |
| April 2026 | 68.3% | 60 |
| May 2026 | 52.0% | 51 |
| June 2026 | 41.7% | 36 |
| July 2026 | 36.1% | 61 |
| August 2026 | 50.8% | 62 |
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