UA597

UA597 arrived on time 69.2% of the time, against 70.9% for all DEN → BOS flights, so this departure is 1.7 percentage points worse than the route as a whole. Against United Airlines’ own flights on this route it is 7.3 points worse.

UA597’s scheduled departure has moved during the period FlyerIntel has on file: it typically left around 1:30 PM earlier on, and around 2:00 PM more recently — a 30-minute shift, not the few minutes of day-to-day rounding every published schedule carries. Confirm the current departure time before booking around an older listing.

Source: US DOT Bureau of Transportation Statistics · 610 operations, March 2024 – July 2026 · If UA597 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 · March 2024 – July 2026

Share of the delay minutes US DOT attributed to each cause for UA597 on DEN → BOS. Only delays of 15 minutes or more are attributed.

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

The aircraft flying UA597 came in 15 or more minutes late on 14% 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, 538 of 603 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 March 2024 – July 2026

UA597 pushes back an average of 22.8 minutes late and reaches the gate at BOS an average of 14.9 minutes late. The 7.8 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. It spends 20.6 minutes on the taxiways at DEN, 4.1 minutes longer than a typical DEN departure in the same hour.

On arrival at BOS, UA597 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 2.0 minutes shorter than a typical BOS arrival (9.0 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 BOS. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 34,873 departures from DEN scheduled in the clock hour UA597 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at BOS (440,886 flights), not just UA597’s own. More on taxi time.

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

UA597 is scheduled out of DEN at 2:10 PM, in the 2 PM–3 PM bank. Departures from DEN in that hour arrive on time 72.1% of the time against 76.0% across the airport’s whole day — the slot alone is worth 3.9 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 · March 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 UA597 currently operates. Blending them would produce an average of two different flights.

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

Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. UA597 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.

• B6394 DEN→BOS JetBlue on the same route, departs 1:33 PM, on time 68.0%
• UA414 BOS→DEN Return trip, BOS to DEN, departs 11:40 AM, on time 90.1%
• UA647 BOS→DEN Return trip, BOS to DEN, departs 7:30 AM, on time 89.2%