UA664

UA664 arrived on time 92.3% of the time, against 79.6% for all LAS → ORD flights, so this departure is 12.7 percentage points better than the route as a whole. Against United Airlines’ own flights on this route it is 9.3 points better.

Source: US DOT Bureau of Transportation Statistics · 1,016 operations, July 2023 – July 2026 · If UA664 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 LAS → ORD route as a whole, better than 95% of 11,788 comparable flight numbers.

92.3% on time for this specific departure, against 79.6% for every LAS → ORD flight.

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

Share of the delay minutes US DOT attributed to each cause for UA664 on LAS → ORD. Only delays of 15 minutes or more are attributed.

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

UA664 is usually the aircraft’s first flight of the day: the schedule gives it a median of 9 hours on the ground at LAS, so its “inbound” is mostly the aircraft’s arrival the evening before.

When the aircraft came in 15 or more minutes late, UA664 pushed back an average of 1 minute early; when it came in on time or early, an average of 1 minute early.

Each departure is matched to the flight the same aircraft flew into LAS just before it, using the tail number in the DOT file, 531 of 1,010 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

UA664 pushes back an average of 2.3 minutes late and reaches the gate at ORD an average of 6.6 minutes early. The 8.9 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 17.1 minutes on the taxiways at LAS is about what any departure from the airport in that hour spends.

On arrival at ORD, UA664 spends 14.1 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 3.7 minutes shorter than a typical ORD arrival (17.8 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 ORD. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 38,794 departures from LAS scheduled in the clock hour UA664 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at ORD (952,666 flights), not just UA664’s own. More on taxi time.

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

UA664 is scheduled out of LAS at 7:00 AM, in the 7 AM–8 AM bank. Departures from LAS in that hour arrive on time 88.3% of the time against 78.0% across the airport’s whole day — the slot alone is worth 10.3 points better before anything about this particular flight is considered.

The two airport figures cover every departure from LAS 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 UA664 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. UA664 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.

• AA2258 LAS→ORD American Airlines on the same route, departs 7:00 AM, on time 87.9%
• UA2102 LAS→ORD United Airlines on the same route, departs 11:59 PM, on time 89.6%
• UA777 ORD→LAS Return trip, ORD to LAS, departs 7:45 PM, on time 76.6%