Flight number record
UA 1255
United Airlines · Spokane to Denver
- Route
- GEG → DEN
- Departs
- 13:41
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1255, check with United Airlines.
UA 1255 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 364 flights, with a median arrival 7 minutes early.
Key figures
On time
78.8%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
8.7%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1255 flies
UA 1255 flies GEG to DEN without a single fixed slot. Its most common scheduled departure was 13:41, used on 104 of 364 flights, with 13:47 (71 flights) and 13:38 (55 flights) next.
- Departs 13:41104 flights28.6%
- Departs 13:4771 flights19.5%
- Departs 13:3855 flights15.1%
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 13:41 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1255 runs level with that at 78.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1255 next to GEG to DEN
Every carrier on GEG to DEN combined arrived on time 84.2% of the time across 2,042 flights, so UA 1255 is 5 points behind it. United flew 826 flights on the same city pair under all its flight numbers, including this one, and those ran 85.8% on time. Across its whole network United Airlines managed 78.8%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1255thin sample | 364 | 78.8% | 83 min | 0.27% | B+ |
| All United Airlines on GEG–DEN | 826 | 85.8% | 86 min | 0.36% | A+ |
| All carriers on GEG–DEN | 2,042 | 84.2% | 69 min | 0.34% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1255 quarter by quarter
UA 1255 did not run the same all year. Its best quarter was Apr–Jun 2026 at 91.0% on time and its weakest Jul–Sep 2025 at 56.7%, a swing of 34 points on roughly 73 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.
- Jul–Sep 202530 flights56.7%
- Oct–Dec 202591 flights81.3%
- Jan–Mar 202690 flights82.2%
- Apr–Jun 202691 flights91.0%
- Jul–Sep 202662 flights62.1%
Scale runs 50% to 95%.
By weekday, UA 1255 ranged from 74.5% on Thursday to 86.3% on Sunday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1255 runs when it is late
UA 1255 often beats the schedule: 90 of 358 completed flights, 25%, arrived 15 minutes or more early. The 76 late arrivals split 24 under half an hour, 21 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early90 flights25.1%
- Within 15 min192 flights53.6%
- 15–29 min late24 flights6.7%
- 30–59 min late21 flights5.9%
- 1–2 hours late11 flights3.1%
- 2+ hours late20 flights5.6%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
19 of 76 late departures made up the time and arrived on time, 25% of them. In the other direction, 19 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 1255
The latest arrival of the period was on 26 November 2025, 7 hours 37 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 November 2025 | 7 hours 37 minutes | Late-arriving aircraft |
| 24 July 2026 | 6 hours 19 minutes | Late-arriving aircraft |
| 15 October 2025 | 4 hours 39 minutes | Late-arriving aircraft |
| 14 August 2026 | 4 hours 16 minutes | National Airspace System |
| 1 December 2025 | 4 hours 3 minutes | Late-arriving aircraft |
Delay causes
Why UA 1255 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,311 reported delay minutes.
- 42%Late-arriving aircraft
- 40%National Airspace System
- 18%Carrier
- 0%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,311 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 6,311 delay minutes reported on UA 1255.
Cancellations are rare at 0.27%, 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
8.7% 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 an hour and a half, which a normal layover absorbs.
The 836 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 one other city pair in the data, including DEN to MEM (35), but none flew often enough under UA 1255 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to GEG to DEN only.
One caution: this is a thin sample. 364 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 1255
For a booking, UA 1255 is one of the weaker ways to fly GEG to DEN: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- GEG to DEN, every carrier and departure
- DEN to GEG, the return direction
- United Airlines 1234 on the same route96.2%
- 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
- 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.