Flight UA1821
United Airlines flight UA1821
Looking for UA1821 in the airâŚ
Houston (IAH) to Raleigh/Durham (RDU)
Historically, this flight arrives 15+ minutes late 6% of the time, and when it is late the delay averages 58 minutes. It was cancelled 1.2% of the time.
- On-time arrivals
- 93.7%
- Less than 15 minutes late
- Cancelled
- 1.2%
- Of scheduled flights
- Average delay when late
- 58 min
- Flights arriving 15+ minutes late
- Flights tracked
- 240
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 59%
- Late-arriving aircraft 24%
- Air traffic control & airport 17%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
New Orleans (MSY) to Houston (IAH)
Historically, this flight arrives 15+ minutes late 13% of the time, and when it is late the delay averages 45 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 86.8%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 45 min
- Flights arriving 15+ minutes late
- Flights tracked
- 168
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 64%
- Extreme weather 20%
- Airline (crew, maintenance, cleaning) 17%
- Late-arriving aircraft 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 41% of the time, and when it is late the delay averages 68 minutes. It was cancelled 8.1% of the time.
- On-time arrivals
- 59.5%
- Less than 15 minutes late
- Cancelled
- 8.1%
- Of scheduled flights
- Average delay when late
- 68 min
- Flights arriving 15+ minutes late
- Flights tracked
- 124
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 56%
- Late-arriving aircraft 29%
- Airline (crew, maintenance, cleaning) 10%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Raleigh/Durham (RDU) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 50% of the time, and when it is late the delay averages 81 minutes. It was cancelled 6.1% of the time.
- On-time arrivals
- 50.0%
- Less than 15 minutes late
- Cancelled
- 6.1%
- Of scheduled flights
- Average delay when late
- 81 min
- Flights arriving 15+ minutes late
- Flights tracked
- 49
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 76%
- Late-arriving aircraft 24%
- Airline (crew, maintenance, cleaning) 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
In the news
More headlines →-
United Airlines First Class Steak And Eggs: Great Steak, But Where Were The Eggs?
Live and Let's Fly United Airlines
-
United Airlines Cuts Starlink Installation Timeline to 18 Months as Rollout Accelerates
Drive Tesla Canada United Airlines
-
President Of United Airlines Holdings Makes $4.00M Sale
Benzinga United Airlines
-
From the US to the Costa Smeralda, the number of flights will double in 2027 with United Airlines
Il Sole 24 ORE United Airlines
-
'Actually Did His Job'- Jessica Pegula Takes Aim at United Airlinesâ AI Support With Special Tennis Request for Helpful Employee
Yardbarker United Airlines
-
âOh My God, What?'â â Serena Williamsâ Coach Canât Believe What Jessica Pegula Went Through With United Airlines
Yahoo Sports United Airlines
Headlines found by Google News; stories open on the publisher's site.
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.7% | 60 |
| October 2025 | 79.1% | 68 |
| November 2025 | 73.8% | 82 |
| December 2025 | 86.7% | 61 |
| January 2026 | 93.8% | 67 |
| February 2026 | 94.5% | 55 |
| March 2026 | 91.4% | 35 |
| April 2026 | 93.1% | 30 |
| May 2026 | 75.0% | 31 |
| June 2026 | 60.0% | 30 |
| July 2026 | 53.8% | 31 |
| August 2026 | 48.1% | 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