Flight UA1233
United Airlines flight UA1233
Looking for UA1233 in the air…
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
-
Advisory Coastal Flood Statement FLL
COASTAL FLOOD STATEMENT NOW IN EFFECT THROUGH THURSDAY EVENING
Weather
Denver (DEN) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 22% of the time, and when it is late the delay averages 67 minutes. It was cancelled 1.6% of the time.
- On-time arrivals
- 78.4%
- Less than 15 minutes late
- Cancelled
- 1.6%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 365
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 67%
- Airline (crew, maintenance, cleaning) 24%
- Late-arriving aircraft 9%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Francisco (SFO) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 35 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 95.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 35 min
- Flights arriving 15+ minutes late
- Flights tracked
- 71
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 54%
- Airline (crew, maintenance, cleaning) 46%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Newark (EWR) to Fort Lauderdale (FLL)
Historically, this flight arrives 15+ minutes late 22% of the time, and when it is late the delay averages 52 minutes. It was cancelled 3.6% of the time.
- On-time arrivals
- 77.8%
- Less than 15 minutes late
- Cancelled
- 3.6%
- Of scheduled flights
- Average delay when late
- 52 min
- Flights arriving 15+ minutes late
- Flights tracked
- 56
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 68%
- Air traffic control & airport 22%
- Airline (crew, maintenance, cleaning) 10%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Newark (EWR) to Raleigh/Durham (RDU)
Historically, this flight arrives 15+ minutes late 62% of the time, and when it is late the delay averages 153 minutes. It was cancelled 7.5% of the time.
- On-time arrivals
- 37.8%
- Less than 15 minutes late
- Cancelled
- 7.5%
- Of scheduled flights
- Average delay when late
- 153 min
- Flights arriving 15+ minutes late
- Flights tracked
- 40
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 64%
- Airline (crew, maintenance, cleaning) 16%
- Air traffic control & airport 13%
- Extreme weather 7%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Newark (EWR) to Houston (IAH)
Historically, this flight arrives 15+ minutes late 21% of the time, and when it is late the delay averages 83 minutes. It was cancelled 5.6% of the time.
- On-time arrivals
- 79.4%
- Less than 15 minutes late
- Cancelled
- 5.6%
- Of scheduled flights
- Average delay when late
- 83 min
- Flights arriving 15+ minutes late
- Flights tracked
- 36
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 80%
- Air traffic control & airport 14%
- Airline (crew, maintenance, cleaning) 6%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
EWR → PBI
Historically, this flight arrives 15+ minutes late 33% of the time, and when it is late the delay averages 53 minutes. It was cancelled 6.9% of the time.
- On-time arrivals
- 66.7%
- Less than 15 minutes late
- Cancelled
- 6.9%
- Of scheduled flights
- Average delay when late
- 53 min
- Flights arriving 15+ minutes late
- Flights tracked
- 29
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 47%
- Airline (crew, maintenance, cleaning) 31%
- Air traffic control & airport 22%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
San Diego (SAN) to Denver (DEN)
Historically, this flight arrives 15+ minutes late 5% of the time, and when it is late the delay averages 132 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 95.2%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 132 min
- Flights arriving 15+ minutes late
- Flights tracked
- 21
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 100%
- Airline (crew, maintenance, cleaning) 0%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Norfolk (ORF) to Denver (DEN)
Only 19 flights on record, which is too few for reliable odds.
- On-time arrivals
- 84.2%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 19
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 88%
- Air traffic control & airport 12%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Tulsa (TUL) to Denver (DEN)
Only 16 flights on record, which is too few for reliable odds.
- On-time arrivals
- 81.2%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 16
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 62%
- Airline (crew, maintenance, cleaning) 38%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Fayetteville/Springdale/Rogers (XNA) to Denver (DEN)
Only 1 flight 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
- —
- Flights arriving 15+ minutes late
- Flights tracked
- 1
- Scheduled flights in the period
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 71.0% | 31 |
| October 2025 | 71.4% | 37 |
| November 2025 | 82.8% | 59 |
| December 2025 | 80.6% | 62 |
| January 2026 | 83.6% | 76 |
| February 2026 | 88.1% | 69 |
| March 2026 | 71.7% | 63 |
| April 2026 | 89.8% | 59 |
| May 2026 | 92.9% | 42 |
| June 2026 | 74.6% | 59 |
| July 2026 | 54.9% | 58 |
| August 2026 | 65.7% | 39 |
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