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DelayAtlas

Carrier route record

UAPITDEN

United Airlines · Pittsburgh to Denver

Flights
883
Period
July 2025 to June 2026
Share of route
52%
Carriers
3
A+GRADE

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

United on PIT to DEN 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 77.6%. When something does go wrong the average delay runs about an hour. That rests on 883 flights, with a median arrival 10 minutes early.

Set against the rest of the country, United's PIT to DEN record is 9 points better than the US average of 77.6%. That gap is worth roughly 92 fewer late arrivals for every thousand flights.

Key figures

On time

86.8%

Arrivals under 15 minutes late, of 873 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

0.68%

National rate is 1.81%

Whole route

81.6%

Every carrier on PIT to DEN, 1,698 flights

These figures cover 883 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.

Carrier by carrier

United against every carrier on PIT to DEN

United flew 883 of the 1,698 flights on PIT to DEN, most of the route. Its 86.8% on time is 5 points better than the route as a whole, which runs 81.6%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from United at 86.8% to Southwest at 75.9%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on PIT to DEN
AirlineFlightsOn timeAvg delayCancelledGrade
United Airlines (this page)88386.8%61 min0.68%A+
Frontier Airlinesthin sample4977.6%105 min0.00%B+
Southwest Airlines76675.9%61 min0.78%B+

Flight by flight

United flight numbers on PIT to DEN

Departure window

When United runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

  • 5am–8am
  • 8am–11am519 flights91.6%
  • 11am–2pm
  • 2pm–5pm364 flights79.9%
  • 5pm–8pm
  • 8pm–5am

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

Book the morning departure. Flights leaving between 8am–11am arrive on time 91.6% of the time, against 79.9% for the afternoon window. That is 12 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 519 flights scheduled in it.

Across the year

United on PIT to DEN through the year

On-time rate by calendar month88J88F89M97A82M72J83J79A91S94O98N78D
Darker means more delays. Figures are on-time percentages.November best, June worst

June is the worst month at 71.7% on time, 26 points below November, the best at 97.7%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 93 flights.

Across the week, Sunday is the strongest day at 92.6% on time and Thursday the weakest at 81.1%. 12 points is a smaller lever than departure hour, but it is free.

On-time rate by day of the week88.1Mon85.9Tue88.9Wed81.1Thu88.0Fri83.1Sat92.6Sun
Monday: 88.1 percent on time. Tuesday: 85.9 percent on time. Wednesday: 88.9 percent on time. Thursday: 81.1 percent on time. Friday: 88.0 percent on time. Saturday: 83.1 percent on time. Sunday: 92.6 percent on time

Delay causes

Why United runs late on this route

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 6,995 reported delay minutes.

  • National Airspace System
    42%
  • Carrier
    39%
  • Late-arriving aircraft
    15%
  • Extreme weather
    3%

The largest share of delay minutes, 39%, 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 2,758 of the 6,995 delay minutes reported here. The split is drawn from 6,995 reported delay minutes.

42% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,922 minutes out of 6,995, against a national NAS share of 21%.

Cancellations are rare at 0.68%, 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 stage length

What a delay here costs

Badly late arrivals are rare here: only 3.8% 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 1,290 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 79.6% on time across 882 flights, 7 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 7 points of difference.

One caution: this is a thin sample. 883 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 United on PIT to DEN

Put together: treat all of this as provisional. 883 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 86.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 873 completed flights over 12 months sit behind that.

Related

Where to go next

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.