Flight UA2129
United Airlines flight UA2129
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Alerts at this flight's airports
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Watch Ground Delay Program SAN
Ground Delay Program at San Diego International Airport (SAN): Average 37 minutes, up to 1 hour and 11 minutes
Reason: airport volume
Airport status
San Diego (SAN) to Dulles (IAD)
Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 131 minutes. It was cancelled 1.2% of the time.
- On-time arrivals
- 87.3%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 131 min
- Flights arriving 15+ minutes late
- Flights tracked
- 326
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 47%
- Extreme weather 27%
- Late-arriving aircraft 18%
- Air traffic control & airport 8%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Las Vegas (LAS)
Only 5 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
- 5
- Scheduled flights in the period
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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 | 96.4% | 29 |
| October 2025 | 96.3% | 27 |
| November 2025 | 83.3% | 30 |
| December 2025 | 93.1% | 29 |
| January 2026 | 84.6% | 27 |
| February 2026 | 95.0% | 20 |
| March 2026 | 82.6% | 24 |
| April 2026 | 100.0% | 25 |
| May 2026 | 82.1% | 28 |
| June 2026 | 100.0% | 30 |
| July 2026 | 66.7% | 31 |
| August 2026 | 74.2% | 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