Flight number record
UA 2255
United Airlines · Hayden to Denver
- Route
- HDN → DEN
- Departs
- 07:00
- Flights
- 257
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2255, check with United Airlines.
UA 2255 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 257 flights, with a median arrival 18 minutes early.
Set against the rest of the country, UA 2255's record is 9 points better than the US average of 77.3%. That gap is worth roughly 93 fewer late arrivals for every thousand flights.
Key figures
On time
86.6%
Arrivals under 15 minutes late, of 253 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
1.56%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 257 flights between September 2025 and August 2026. The median arrival is 18 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.
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Schedule
When UA 2255 flies
UA 2255 flies HDN to DEN without a single fixed slot. Its most common scheduled departure was 07:00, used on 111 of 257 flights, with 07:25 (71 flights) and 07:05 (42 flights) next.
- Departs 07:00111 flights43.2%
- Departs 07:2571 flights27.6%
- Departs 07:0542 flights16.3%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 2255 runs 3 points worse at 86.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 2255 next to HDN to DEN
Every carrier on HDN to DEN combined arrived on time 80.3% of the time across 1,433 flights, so UA 2255 is 6 points ahead of it. United flew 779 flights on the same city pair under all its flight numbers, including this one, and those ran 83.9% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2255thin sample | 257 | 86.6% | 80 min | 1.56% | A |
| All United Airlines on HDN–DEN | 779 | 83.9% | 76 min | 0.90% | B+ |
| All carriers on HDN–DEN | 1,433 | 80.3% | 74 min | 0.56% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2255 quarter by quarter
UA 2255 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.3% on time and its weakest Jan–Mar 2026 at 80.9%, a swing of 12 points on roughly 86 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Oct–Dec 202514 flights—
- Jan–Mar 202690 flights80.9%
- Apr–Jun 202691 flights90.0%
- Jul–Sep 202662 flights93.3%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2255 did best on Monday at 94.6% on time and worst on Saturday at 80.6%. Each day rests on about 37 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2255 runs when it is late
UA 2255 often beats the schedule: 144 of 253 completed flights, 57%, arrived 15 minutes or more early. The 34 late arrivals split 13 under half an hour, 9 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early144 flights56.9%
- Within 15 min75 flights29.6%
- 15–29 min late13 flights5.1%
- 30–59 min late9 flights3.6%
- 1–2 hours late2 flights0.8%
- 2+ hours late10 flights4.0%
Scale runs 0% to 100%.
Share of 253 completed flights by arrival against schedule.
A late pushback is often recovered here: of 31 departures that left 15 minutes late or more, 11 still arrived on time. In the other direction, 14 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for UA 2255
The latest arrival of the period was on 9 June 2026, 3 hours 59 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 June 2026 | 3 hours 59 minutes | Carrier |
| 27 March 2026 | 3 hours 35 minutes | Carrier |
| 18 July 2026 | 3 hours 21 minutes | Late-arriving aircraft |
| 3 April 2026 | 3 hours 18 minutes | Late-arriving aircraft |
| 22 April 2026 | 3 hours 16 minutes | Carrier |
Delay causes
Why UA 2255 runs late
Carrier accounts for 56% of the 2,726 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 23%National Airspace System
- 21%Late-arriving aircraft
- 0%Extreme weather
The largest share of delay minutes, 56%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,518 of the 2,726 delay minutes reported here. The split is drawn from 2,726 delay minutes reported on UA 2255.
Cancellations sit at 1.56% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The same number turns up on two other city pairs in the data, including DEN to BOI (156) and DEN to IND (108), but none flew often enough under UA 2255 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to HDN to DEN only.
One caution: this is a thin sample. 257 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 2255
For a booking, read UA 2255 as 86.6% on time with 1.56% cancelled over 257 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- HDN to DEN, every carrier and departure
- DEN to HDN, the return direction
- Denver International (DEN) 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
- Worst months to fly in the US, ranked by the data
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.