Flight UA321
United Airlines flight UA321
Looking for UA321 in the airâŚ
Chicago (ORD) to Phoenix (PHX)
Historically, this flight arrives 15+ minutes late 19% of the time, and when it is late the delay averages 60 minutes. It was cancelled 0.0% of the time.
- On-time arrivals
- 81.1%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 206
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 40%
- Air traffic control & airport 31%
- Late-arriving aircraft 24%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Philadelphia (PHL) to Chicago (ORD)
Historically, this flight arrives 15+ minutes late 32% of the time, and when it is late the delay averages 36 minutes. It was cancelled 2.8% of the time.
- On-time arrivals
- 67.6%
- Less than 15 minutes late
- Cancelled
- 2.8%
- Of scheduled flights
- Average delay when late
- 36 min
- Flights arriving 15+ minutes late
- Flights tracked
- 36
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 58%
- Late-arriving aircraft 26%
- Airline (crew, maintenance, cleaning) 16%
- 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 |
|---|---|---|
| October 2025 | 100.0% | 5 |
| November 2025 | 83.3% | 30 |
| December 2025 | 59.1% | 44 |
| January 2026 | 66.7% | 36 |
| February 2026 | 89.3% | 28 |
| March 2026 | 87.2% | 49 |
| April 2026 | 83.3% | 30 |
| May 2026 | 95.0% | 20 |
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