Flight UA2356
United Airlines flight UA2356
Looking for UA2356 in the airâŚ
Alerts at this flight's airports
Las Vegas (LAS) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 41% of the time, and when it is late the delay averages 53 minutes. It was cancelled 0.3% of the time.
- On-time arrivals
- 59.1%
- Less than 15 minutes late
- Cancelled
- 0.3%
- Of scheduled flights
- Average delay when late
- 53 min
- Flights arriving 15+ minutes late
- Flights tracked
- 346
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 74%
- Late-arriving aircraft 13%
- Airline (crew, maintenance, cleaning) 12%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Boston (BOS)
Historically, this flight arrives 15+ minutes late 37% of the time, and when it is late the delay averages 86 minutes. It was cancelled 0.9% of the time.
- On-time arrivals
- 63.0%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 86 min
- Flights arriving 15+ minutes late
- Flights tracked
- 328
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 60%
- Late-arriving aircraft 19%
- Airline (crew, maintenance, cleaning) 18%
- Extreme weather 2%
- 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 | 40.0% | 60 |
| October 2025 | 50.0% | 62 |
| November 2025 | 61.7% | 60 |
| December 2025 | 76.1% | 46 |
| January 2026 | 80.6% | 36 |
| February 2026 | 78.6% | 45 |
| March 2026 | 73.8% | 62 |
| April 2026 | 68.3% | 60 |
| May 2026 | 45.9% | 62 |
| June 2026 | 63.3% | 60 |
| July 2026 | 56.5% | 62 |
| August 2026 | 54.2% | 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