UA1577

UA1577 arrived on time 76.4% of the time, against 71.8% for all ORD → SFO flights, so this departure is 4.6 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 2.2 points better.

Source: US DOT Bureau of Transportation Statistics · 694 operations, May 2024 – July 2026 · If UA1577 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 · May 2024 – July 2026

Share of the delay minutes US DOT attributed to each cause for UA1577 on ORD → SFO. Only delays of 15 minutes or more are attributed.

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

The aircraft flying UA1577 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 ORD just before it, using the tail number in the DOT file, 635 of 689 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 May 2024 – July 2026

UA1577 pushes back an average of 22.3 minutes late and reaches the gate at SFO an average of 12.7 minutes late. The 9.7 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 26.9 minutes on the taxiways at ORD is about what any departure from the airport in that hour spends.

On arrival at SFO, UA1577 spends 7.0 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 about what any arrival at SFO spends on the ground before reaching the gate.

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 66,182 departures from ORD scheduled in the clock hour UA1577 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 UA1577’s own. More on taxi time.

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

UA1577 is scheduled out of ORD at 2:35 PM, in the 2 PM–3 PM bank. Departures from ORD in that hour arrive on time 74.1% of the time against 74.5% across the airport’s whole day, so the hour UA1577 leaves in is an ordinary one for ORD and explains nothing about its record either way.

The two airport figures cover every departure from ORD 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 · May 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 UA1577 currently operates. Blending them would produce an average of two different flights.

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

Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA1577 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.

• AA1253 ORD→SFO American Airlines on the same route, departs 3:17 PM, on time 73.0%
• UA2305 SBA→SFO United Airlines flight into SFO, SBA to SFO, departs 2:10 PM, on time 62.4%
• UA739 OMA→ORD United Airlines flight into ORD, OMA to ORD, departs 3:27 PM, on time 72.1%
• UA488 BUR→SFO United Airlines flight into SFO, BUR to SFO, departs 7:00 AM, on time 83.8%