Flight number record
UA 1588
United Airlines · Denver to Redmond
- Route
- DEN → RDM
- Departs
- 19:29
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1588, check with United Airlines.
UA 1588 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 363 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so UA 1588 runs 5 points behind the country as a whole. Across a thousand flights that is about 51 extra late arrivals.
Key figures
On time
72.2%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
10.7%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 1588 flies
UA 1588 flies DEN to RDM without a single fixed slot. Its most common scheduled departure was 19:29, used on 46 of 363 flights, with 19:36 (45 flights) and 19:35 (42 flights) next.
- Departs 19:2946 flights12.7%
- Departs 19:3645 flights12.4%
- Departs 19:3542 flights11.6%
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 19:29 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 1588 runs 4 points better at 72.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 1588 next to DEN to RDM
Every carrier on DEN to RDM combined arrived on time 70.7% of the time across 727 flights, so UA 1588 is 2 points ahead of it. Across its whole network United Airlines managed 78.8%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1588thin sample | 363 | 72.2% | 71 min | 0.55% | C+ |
| All United Airlines on DEN–RDM | 727 | 70.7% | 54 min | 0.28% | C+ |
| All carriers on DEN–RDM | 727 | 70.7% | 54 min | 0.28% | C+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1588 quarter by quarter
UA 1588 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 55.7%, a swing of 28 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 flights83.3%
- Oct–Dec 202591 flights70.0%
- Jan–Mar 202690 flights82.1%
- Apr–Jun 202691 flights72.5%
- Jul–Sep 202661 flights55.7%
Scale runs 45% to 90%.
By weekday, UA 1588 did best on Monday at 80.8% on time and worst on Friday at 65.4%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1588 runs when it is late
The 99 late arrivals split 30 under half an hour, 31 between 30 and 60 minutes, and 38 an hour or more.
- 15+ min early54 flights15.2%
- Within 15 min203 flights57.0%
- 15–29 min late30 flights8.4%
- 30–59 min late31 flights8.7%
- 1–2 hours late18 flights5.1%
- 2+ hours late20 flights5.6%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
27 of 113 late departures made up the time and arrived on time, 24% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for UA 1588
The latest arrival of the period was on 17 February 2026, 4 hours 21 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 |
|---|---|---|
| 17 February 2026 | 4 hours 21 minutes | Carrier |
| 11 June 2026 | 4 hours 16 minutes | Late-arriving aircraft |
| 21 August 2026 | 4 hours 3 minutes | Carrier |
| 22 July 2026 | 4 hours 2 minutes | Late-arriving aircraft |
| 8 August 2026 | 3 hours 54 minutes | Late-arriving aircraft |
Delay causes
Why UA 1588 runs late
Late-arriving aircraft accounts for 65% of the 7,043 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Late-arriving aircraft
- 27%Carrier
- 7%National Airspace System
65% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,043 reported delay minutes here, that single category outweighs weather by 65 to one. The split is drawn from 7,043 delay minutes reported on UA 1588.
Cancellations are rare at 0.55%, 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
10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 898 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 three other city pairs in the data, including MSY to DEN (36), PNS to DEN (32) and TYS to DEN (21), but none flew often enough under UA 1588 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to RDM only.
One caution: this is a thin sample. 363 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 1588
For a booking, read UA 1588 as 72.2% on time with 0.55% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to RDM, every carrier and departure
- RDM to DEN, the return direction
- United Airlines 2082 on the same route69.2%
- 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.