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United Airlines / ORD → PHX

UA 455 on time

United Airlines 455: Chicago to Phoenix at 1:30 p.m.; Pittsburgh to Chicago at 10:54 a.m. (past 12 months). Figures below the title are for ORD → PHX, its busiest leg

On time
83%
286 flights · likely 78–87%
Cancelled
0.7%
of scheduled flights
Typical arrival
−8 min
median vs schedule
When late
+72 min
average delay
Similar flights
82%
UA, same route & hour

About 1 in 6 UA 455 flights from Chicago arrived 15+ minutes late, diverted or cancelled over the past year (17%); 0.7% were cancelled. The typical flight landed 8 minutes early.

UA 455: ORD → PHX

Scheduled to leave Chicago at 1:30 p.m. local time. Over the past year it arrived on time 83% of the time (286 flights), in line with other UA flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Oct 2025: too few flights (6 flights)OctNov 2025: 77% on time (30 flights)77NovDec 2025: 87% on time (31 flights)87DecJan 2026: 84% on time (31 flights)84JanFeb 2026: 89% on time (28 flights)89FebMar 2026: too few flights (7 flights)MarApr 2026: 83% on time (30 flights)83AprMay 2026: 77% on time (31 flights)77MayJun 2026: 80% on time (30 flights)80JunJul 2026: 87% on time (31 flights)87JulAug 2026: 77% on time (31 flights)77Aug

By day of week

DayFlightsOn time
Monday4279%
Tuesday4185%
Wednesday4185%
Thursday4090%
Friday4075%
Saturday4085%
Sunday4283%

Why it was late

Late inbound plane 46%Airline (crew, maintenance, ops) 30%Air traffic & airport (NAS) 20%Severe weather 4%

All flights ORD → PHX · Connecting off UA 455? Check the risk

UA 455: PIT → ORD

Scheduled to leave Pittsburgh at 10:54 a.m. local time. Over the past year it arrived on time 82% of the time (144 flights), in line with other UA flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Mar 2026: 70% on time (20 flights)70MarApr 2026: too few flights (1 flights)AprMay 2026: 94% on time (31 flights)94MayJun 2026: 90% on time (30 flights)90JunJul 2026: 87% on time (31 flights)87JulAug 2026: 65% on time (31 flights)65Aug

By day of week

DayFlightsOn time
Monday2167%
Tuesday2095%
Wednesday2085%
Thursday2282%
Friday2286%
Saturday18—
Sunday2181%

Why it was late

Air traffic & airport (NAS) 39%Late inbound plane 29%Severe weather 23%Airline (crew, maintenance, ops) 9%

All flights PIT → ORD · Connecting off UA 455? Check the risk

Questions

How often is UA 455 from ORD to PHX late?

United Airlines 455 from Chicago, IL to Phoenix, AZ arrived 15 or more minutes late, was diverted or was cancelled on 17% of 286 scheduled flights between September 2025 and August 2026. 0.7% were cancelled.

How often is UA 455 from PIT to ORD late?

United Airlines 455 from Pittsburgh, PA to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 18% of 144 scheduled flights between September 2025 and August 2026. 4.2% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.