Flight UA2831
United Airlines flight UA2831
Looking for UA2831 in the air…
Alerts at this flight's airports
Seattle (SEA) to San Francisco (SFO)
Historically, this flight arrives 15+ minutes late 70% of the time, and when it is late the delay averages 80 minutes. It was cancelled 1.9% of the time.
- On-time arrivals
- 29.7%
- Less than 15 minutes late
- Cancelled
- 1.9%
- Of scheduled flights
- Average delay when late
- 80 min
- Flights arriving 15+ minutes late
- Flights tracked
- 103
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 47%
- Air traffic control & airport 46%
- Late-arriving aircraft 6%
- Security 1%
- Extreme weather 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Houston (IAH)
Historically, this flight arrives 15+ minutes late 43% of the time, and when it is late the delay averages 42 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 57.1%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 42 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 57%
- Late-arriving aircraft 28%
- Airline (crew, maintenance, cleaning) 14%
- 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 |
|---|---|---|
| May 2026 | 30.0% | 11 |
| June 2026 | 24.1% | 30 |
| July 2026 | 41.9% | 31 |
| August 2026 | 36.5% | 52 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data