UA1812

UA1812 arrived on time 78.6% of the time, against 67.8% for all DEN → SFO flights, so this departure is 10.8 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 5.3 points better.

Source: US DOT Bureau of Transportation Statistics · 655 operations, June 2024 – July 2026 · If UA1812 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.

This flight runs unusually far ahead of the DEN → SFO route as a whole, better than 92% of 11,788 comparable flight numbers.

78.6% on time for this specific departure, against 67.8% for every DEN → SFO flight.

Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.

Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026

Share of the delay minutes US DOT attributed to each cause for UA1812 on DEN → SFO. Only delays of 15 minutes or more are attributed.

Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026

The aircraft flying UA1812 came in 15 or more minutes late on 10% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.

Each departure is matched to the flight the same aircraft flew into DEN just before it, using the tail number in the DOT file, 616 of 655 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 June 2024 – July 2026

UA1812 pushes back an average of 12.6 minutes late and reaches the gate at SFO an average of 4.4 minutes late. The 8.3 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 18.9 minutes on the taxiways at DEN is about what any departure from the airport in that hour spends.

On arrival at SFO, UA1812 spends 6.9 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 1.0 minutes shorter than a typical SFO arrival (7.9 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 SFO. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 83,741 departures from DEN scheduled in the clock hour UA1812 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at SFO (436,060 flights), not just UA1812’s own. More on taxi time.

Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026

UA1812 is scheduled out of DEN at 1:25 PM, in the 1 PM–2 PM bank. Departures from DEN in that hour arrive on time 79.4% of the time against 76.0% across the airport’s whole day — the slot alone is worth 3.4 points better 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 · June 2024 – July 2026 · Hours below 120 departures are not scored.

Because the same number has served different journeys, the statistics above describe only the route UA1812 currently operates. Blending them would produce an average of two different flights.

Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026

Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA1812 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.

• UA1561 DEN→SFO United Airlines on the same route, departs 11:35 AM, on time 73.6%
• UA1007 DEN→SFO United Airlines on the same route, departs 5:59 PM, on time 66.9%
• F93439 DEN→SFO Frontier Airlines on the same route, departs 10:29 PM, on time 65.3%
• UA1668 AUS→SFO United Airlines flight into SFO, AUS to SFO, departs 9:30 AM, on time 79.5%