Flight UA556
United Airlines flight UA556
Looking for UA556 in the airâŚ
Newark (EWR) to Houston (IAH)
Historically, this flight arrives 15+ minutes late 21% of the time, and when it is late the delay averages 67 minutes. It was cancelled 1.0% of the time.
- On-time arrivals
- 79.4%
- Less than 15 minutes late
- Cancelled
- 1.0%
- Of scheduled flights
- Average delay when late
- 67 min
- Flights arriving 15+ minutes late
- Flights tracked
- 103
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 39%
- Airline (crew, maintenance, cleaning) 30%
- Extreme weather 21%
- Late-arriving aircraft 10%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Atlanta (ATL) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 17% of the time, and when it is late the delay averages 78 minutes. It was cancelled 2.8% of the time.
- On-time arrivals
- 82.9%
- Less than 15 minutes late
- Cancelled
- 2.8%
- Of scheduled flights
- Average delay when late
- 78 min
- Flights arriving 15+ minutes late
- Flights tracked
- 72
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 42%
- Air traffic control & airport 37%
- Late-arriving aircraft 19%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Bozeman (BZN) to Los Angeles (LAX)
Historically, this flight arrives 15+ minutes late 2% of the time, and when it is late the delay averages 222 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 98.1%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 222 min
- Flights arriving 15+ minutes late
- Flights tracked
- 53
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 100%
- Airline (crew, maintenance, cleaning) 0%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Charlotte (CLT)
Historically, this flight arrives 15+ minutes late 4% of the time, and when it is late the delay averages 77 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 95.7%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 77 min
- Flights arriving 15+ minutes late
- Flights tracked
- 47
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 100%
- Airline (crew, maintenance, cleaning) 0%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to New York (LGA)
Historically, this flight arrives 15+ minutes late 25% of the time, and when it is late the delay averages 57 minutes. It was cancelled 2.7% of the time.
- On-time arrivals
- 75.0%
- Less than 15 minutes late
- Cancelled
- 2.7%
- Of scheduled flights
- Average delay when late
- 57 min
- Flights arriving 15+ minutes late
- Flights tracked
- 37
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 53%
- Air traffic control & airport 36%
- Late-arriving aircraft 11%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Newark (EWR) to Phoenix (PHX)
Only 19 flights on record, which is too few for reliable odds.
- On-time arrivals
- 78.9%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 65 min
- Flights arriving 15+ minutes late
- Flights tracked
- 19
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 72%
- Airline (crew, maintenance, cleaning) 19%
- Air traffic control & airport 10%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Jackson (JAC)
Only 8 flights on record, which is too few for reliable odds.
- On-time arrivals
- 75.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 161 min
- Flights arriving 15+ minutes late
- Flights tracked
- 8
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 90%
- Air traffic control & airport 8%
- Airline (crew, maintenance, cleaning) 2%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Houston (IAH) to Bozeman (BZN)
Only 7 flights on record, which is too few for reliable odds.
- On-time arrivals
- 71.4%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 47 min
- Flights arriving 15+ minutes late
- Flights tracked
- 7
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 73%
- Late-arriving aircraft 27%
- Airline (crew, maintenance, cleaning) 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Chicago (ORD) to Minneapolis (MSP)
Only 3 flights on record, which is too few for reliable odds.
- On-time arrivals
- 66.7%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 78 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 100%
- Late-arriving aircraft 0%
- Air traffic control & airport 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
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Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 92.3% | 26 |
| October 2025 | 100.0% | 27 |
| November 2025 | 96.7% | 30 |
| December 2025 | 93.5% | 31 |
| January 2026 | 66.7% | 31 |
| February 2026 | 84.6% | 28 |
| March 2026 | 71.0% | 31 |
| April 2026 | 81.5% | 27 |
| May 2026 | 92.3% | 26 |
| June 2026 | 76.7% | 30 |
| July 2026 | 76.7% | 31 |
| August 2026 | 83.9% | 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