Flight number record

UA 621

United Airlines · Albuquerque to Denver

Route: ABQ → DEN
Departs: 07:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 621, check with United Airlines.

UA 621 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 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 365 flights, with a median arrival 10 minutes early.

Set against the rest of the country, UA 621's record is 12 points better than the US average of 77.6%. That gap is worth roughly 122 fewer late arrivals for every thousand flights.

On time

89.8%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 10 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 621 flies

UA 621 is scheduled to leave Albuquerque (ABQ) at 07:00 local time and reach Denver (DEN) at 08:28. That slot held for 364 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 07:00364 flights99.7%

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 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 621 runs level with that at 89.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

UA 621 next to ABQ to DEN

Every carrier on ABQ to DEN combined arrived on time 82.1% of the time across 3,175 flights, so UA 621 is 8 points ahead of it. United flew 817 flights on the same city pair under all its flight numbers, including this one, and those ran 83.5% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 11 points.

UA 621 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 621	365	89.8%	70 min	0.55%	A+
All United Airlines on ABQ–DEN	817	83.5%	78 min	0.86%	B+
All carriers on ABQ–DEN	3,175	82.1%	63 min	0.72%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 621 quarter by quarter

Quarter by quarter UA 621 held fairly steady: 85.7% in Jul–Sep 2025, 90.1% in Oct–Dec 2025, 93.3% in Jan–Mar 2026 and 90.0% in Apr–Jun 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.

Jul–Sep 202592 flights85.7%
Oct–Dec 202592 flights90.1%
Jan–Mar 202690 flights93.3%
Apr–Jun 202691 flights90.0%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 621 did best on Friday at 98.0% on time and worst on Thursday at 84.0%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 621 runs late

One category carries most of the weight here. Carrier accounts for 72% of the 2,575 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.

Carrier
72%
National Airspace System
27%
Extreme weather
1%

The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,849 of the 2,575 delay minutes reported here. The split is drawn from 2,575 delay minutes reported on UA 621.

Cancellations are rare at 0.55%, 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

Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.1% 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 one other city pair in the data, including DEN to GSP (20), but none flew often enough under UA 621 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ABQ to DEN only.

One caution: this is a thin sample. 365 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 621

For a booking, UA 621 has one of the better records a US domestic flight can show: 89.8% on time and 0.55% 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