Flight number record

UA 588

United Airlines · Durango to Denver

Route: DRO → DEN
Departs: 13:38
Flights: 253
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 588, check with United Airlines.

UA 588 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 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 253 flights, with a median arrival 11 minutes early.

Set against the rest of the country, UA 588's record is 8 points better than the US average of 77.6%. That gap is worth roughly 77 fewer late arrivals for every thousand flights.

On time

85.3%

Arrivals under 15 minutes late, of 252 completed flights

Avg delay

81 min

Across delayed arrivals only, not all flights

Cancelled

0.40%

National rate is 1.81%

1 hour+ late

5.6%

National rate is 8.1%

These figures cover 253 flights between July 2025 and June 2026. The median arrival is 11 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.

Schedule

When UA 588 flies

UA 588 flies DRO to DEN without a single fixed slot. Its most common scheduled departure was 13:38, used on 73 of 253 flights, with 13:36 (59 flights) and 13:40 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:3873 flights28.9%
Departs 13:3659 flights23.3%
Departs 13:4037 flights14.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 13:38 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 588 runs 7 points better at 85.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 588 next to DRO to DEN

Every carrier on DRO to DEN combined arrived on time 81.2% of the time across 2,192 flights, so UA 588 is 4 points ahead of it. United flew 731 flights on the same city pair under all its flight numbers, including this one, and those ran 83.3% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 6 points.

UA 588 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 588thin sample	253	85.3%	81 min	0.40%	A+
All United Airlines on DRO–DEN	731	83.3%	70 min	0.55%	B+
All carriers on DRO–DEN	2,192	81.2%	87 min	1.23%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 588 quarter by quarter

UA 588 did not run the same all year. Its best quarter was Apr–Jun 2026 at 90.0% on time and its weakest Jul–Sep 2025 at 76.7%, a swing of 13 points on roughly 63 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 202543 flights76.7%
Oct–Dec 202591 flights85.7%
Jan–Mar 202669 flights86.8%
Apr–Jun 202650 flights90.0%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 588 ranged from 83.3% on Sunday to 86.5% on Tuesday. With about 36 flights behind each day, a spread of 3 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 588 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 66% of the 2,985 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
66%
Carrier
18%
National Airspace System
15%
Extreme weather
2%

66% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,985 reported delay minutes here, that single category outweighs weather by 34 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,985 delay minutes reported on UA 588.

Cancellations are rare at 0.40%, below the national 1.81% 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

5.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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 same number turns up on two other city pairs in the data, including DEN to IAH (139) and DEN to JAC (49), but none flew often enough under UA 588 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DRO to DEN only.

One caution: this is a thin sample. 253 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 588

For a booking, UA 588 has one of the better records a US domestic flight can show: 85.3% on time and 0.40% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures