UA2651

UA2651 arrived on time 69.8% of the time, against 74.7% for all DEN → SEA flights, so this departure is 4.9 percentage points worse than the route as a whole. Against United Airlines’ own flights on this route it is 9.9 points worse.

Source: US DOT Bureau of Transportation Statistics · 806 operations, July 2023 – July 2026 · If UA2651 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026

Share of the delay minutes US DOT attributed to each cause for UA2651 on DEN → SEA. Only delays of 15 minutes or more are attributed.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

When the aircraft came in 15 or more minutes late, UA2651 pushed back an average of 43 minutes late; when it came in on time or early, an average of 2 minutes late.

Each departure is matched to the flight the same aircraft flew into DEN just before it, using the tail number in the DOT file, 706 of 798 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

UA2651 pushes back an average of 17.9 minutes late and reaches the gate at SEA an average of 13.7 minutes late. The 4.2 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. Its 18.4 minutes on the taxiways at DEN is about what any departure from the airport in that hour spends.

On arrival at SEA, UA2651 spends 14.7 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 2.8 minutes longer than a typical SEA arrival (11.9 min).

Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached SEA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 56,780 departures from DEN scheduled in the clock hour UA2651 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SEA (510,187 flights), not just UA2651’s own. More on taxi time.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026

UA2651 is scheduled out of DEN at 8:55 PM, in the 8 PM–9 PM bank. Departures from DEN in that hour arrive on time 68.2% of the time against 76.0% across the airport’s whole day — the slot alone is worth 7.8 points worse before anything about this particular flight is considered.

The two airport figures cover every departure from DEN to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Days with fewer than 120 operations are not scored.

Because the same number has served different journeys, the statistics above describe only the route UA2651 currently operates. Blending them would produce an average of two different flights.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA2651 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.

• AS643 DEN→SEA Alaska Airlines on the same route, departs 6:00 AM, on time 88.2%
• DL1731 DEN→SEA Delta Air Lines on the same route, departs 6:15 AM, on time 90.1%
• UA757 SEA→DEN Return trip, SEA to DEN, departs 3:48 PM, on time 84.3%