Flight number record
UA 455
United Airlines · Chicago to Phoenix
- Route
- ORD → PHX
- Departs
- 13:30
- Flights
- 286
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 455, check with United Airlines.
UA 455 lands a B+, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 286 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 455's record is 7 points better than the US average of 77.3%. That gap is worth roughly 65 fewer late arrivals for every thousand flights.
Key figures
On time
83.8%
Arrivals under 15 minutes late, of 284 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
0.70%
National rate is 1.89%
1 hour+ late
7.4%
National rate is 8.3%
These figures cover 286 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When UA 455 flies
UA 455 flies ORD to PHX without a single fixed slot. Its most common scheduled departure was 13:30, used on 89 of 286 flights, with 12:55 (68 flights) and 13:00 (37 flights) next.
- Departs 13:3089 flights31.1%
- Departs 12:5568 flights23.8%
- Departs 13:0037 flights12.9%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 455 runs 6 points better at 83.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
UA 455 next to ORD to PHX
Every carrier on ORD to PHX combined arrived on time 72.4% of the time across 5,631 flights, so UA 455 is 11 points ahead of it. United flew 1,989 flights on the same city pair under all its flight numbers, including this one, and those ran 78.3% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 455thin sample | 286 | 83.8% | 72 min | 0.70% | B+ |
| All United Airlines on ORD–PHX | 1,989 | 78.3% | 73 min | 0.55% | B+ |
| All carriers on ORD–PHX | 5,631 | 72.4% | 82 min | 1.63% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 455 quarter by quarter
Quarter by quarter UA 455 held fairly steady: 84.8% in Oct–Dec 2025, 87.9% in Jan–Mar 2026, 80.2% in Apr–Jun 2026 and 83.6% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202567 flights84.8%
- Jan–Mar 202666 flights87.9%
- Apr–Jun 202691 flights80.2%
- Jul–Sep 202662 flights83.6%
Scale runs 70% to 95%.
By weekday, UA 455 did best on Thursday at 90.0% on time and worst on Friday at 75.0%. Each day rests on about 41 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 455 runs when it is late
UA 455 often beats the schedule: 93 of 284 completed flights, 33%, arrived 15 minutes or more early. The 46 late arrivals split 15 under half an hour, 10 between 30 and 60 minutes, and 21 an hour or more.
- 15+ min early93 flights32.7%
- Within 15 min145 flights51.1%
- 15–29 min late15 flights5.3%
- 30–59 min late10 flights3.5%
- 1–2 hours late11 flights3.9%
- 2+ hours late10 flights3.5%
Scale runs 0% to 100%.
Share of 284 completed flights by arrival against schedule.
A late pushback is often recovered here: of 49 departures that left 15 minutes late or more, 15 still arrived on time. 12 flights left on time and still arrived late.
The worst days
Worst days for UA 455
The latest arrival of the period was on 10 November 2025, 4 hours 14 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 November 2025 | 4 hours 14 minutes | Carrier |
| 13 August 2026 | 4 hours 4 minutes | Late-arriving aircraft |
| 17 June 2026 | 3 hours 33 minutes | Late-arriving aircraft |
| 14 November 2025 | 2 hours 32 minutes | Carrier |
| 29 August 2026 | 2 hours 32 minutes | Late-arriving aircraft |
Delay causes
Why UA 455 runs late
Late-arriving aircraft accounts for 46% of the 3,293 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 30%Carrier
- 20%National Airspace System
- 4%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,293 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 3,293 delay minutes reported on UA 455.
Cancellations are rare at 0.70%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
7.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The 1,440 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on seven other city pairs in the data, including BWI to ORD (144), PIT to ORD (144) and PHX to EWR (37), but none flew often enough under UA 455 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to PHX only.
One caution: this is a thin sample. 286 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 455
For a booking, read UA 455 as 83.8% on time with 0.70% cancelled over 286 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to PHX, every carrier and departure
- PHX to ORD, the return direction
- United Airlines 602 on the same route68.0%
- Chicago O'Hare International (ORD) delay statistics
- Phoenix Sky Harbor International (PHX) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.